GMC Motorhome Wiki - User contributions [en]

Terms of Service/License Policies

2024-01-15T18:09:39Z

Bob Crisler:

This GMCMHWiki is provided for research and educational uses of the GMC Motorhome community.

There are no guarantees here and you have no rights of redress if this wiki is down or discontinued. Every effort will be made, however, to pass ownership and administration of this wiki on to another member or members of the GMC Motorhome community should the current administrator not be able to continue operating it.

Content you place here is your responsibility; any content that constitutes an obvious, prima facie copyright violation will be taken down. So, in general, please get permission if you're posting someone else's work. If the person has passed, as can be the case in the GMC MH community, please at least attempt to contact a close relative to receive permission (and note the permission in a credit line with the original author's name and the name of the grantor of the permission). Part of the point of this wiki is preservation of the great work and insights of prior-generation POs, and in some cases preservation of materials is preferable to having those ideas and insights perish along with their author.

Content here is created or repurposed under a Creative Commons Zero public domain license, meaning all rights from authors are waived, the content is dedicated to the public domain as soon as it is published, and anyone may use the content in a derivative work.

EXCEPTIONS: Some archival photography is used here which is sourced from GM publicity or marketing materials or manuals.

TO COPYRIGHT HOLDERS: If any valid or even plausible copyright claim is made regarding any content on this site, it will be immediately removed.

Terms of Service/License Policies

2024-01-15T18:07:35Z

Bob Crisler: Reworked the content

This GMCMHWiki is provided for research and educational uses of the GMC Motorhome community.

There are no guarantees here and you have no rights of redress if this wiki is down or discontinued. Every effort will be made, however, to pass ownership and administration of this wiki on to another member or members of the GMC Motorhome community should the current administrator not be able to continue operating it.

Content you place here is your responsibility; any content that constitutes an obvious, prima facie copyright violation will be taken down. So, in general, please get permission if you're posting someone else's work. If the person has passed, as can be the case in the GMC MH community, please at least attempt a contact to a close relative. But part of the point of this wiki is preservation of the great work and insights of prior-generation POs, and in some cases preservation of materials is preferable to having those ideas and insights perish along with their author.

Content here is created or repurposed under a Creative Commons Zero public domain license, meaning all rights from authors are waived, the content is dedicated to the public domain as soon as it is published, and anyone may use the content in a derivative work.

EXCEPTIONS: Some archival photography is used here which is sourced from GM publicity or marketing materials or manuals.

TO COPYRIGHT HOLDERS: If any valid or even plausible copyright claim is made regarding any content on this site, it will be immediately removed.

MediaWiki:Sidebar

2024-01-15T18:02:40Z

Bob Crisler:

MediaWiki:Sidebar

2024-01-15T18:01:58Z

Bob Crisler:

MediaWiki:Sidebar

2024-01-15T18:01:18Z

Bob Crisler: added a policies link

Terms of Service/License Policies

2024-01-15T17:59:23Z

Bob Crisler: New page

There are no terms of service other than to say that there are no guarantees here and you have no rights of redress if this wiki is down or discontinued. Content you place here is your responsibility; any content that constitutes a copyright violation will be taken down. So, in general, please get permission if you're posting someone else's work. If the person has passed, as can be the case in the GMC community, please at least attempt a contact to a close relative. But part of the point of this wiki is preservation of the great work and insights of prior-generation POs, and in some cases preservation of materials is preferable to having those ideas and insights perish along with their author. This GMCMHWiki is provided for research and educational uses of the GMC Motorhome community.

Content here is created or repurposed under a Creative Commons Zero public domain license, meaning all rights from authors are waived, the content is dedicated to the public domain as soon as it is published, and anyone may use the content in a derivative work.

EXCEPTIONS: Some archival photography is used here which is sourced from GM publicity or marketing materials or manuals.

If any valid or even plausible copyright claim is made on any content here, it will be immediately removed.

Welcome to the GMC Motorhome Wiki

2024-01-15T17:38:28Z

Bob Crisler: /* Create a New Article */ added a note on "this is my own work"

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same.*

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===
NOTE: Some parts of the MediaWiki interface are hard-coded. The File Upload dialog box, for instance, carries a "This is my own work" checkbox which can't be amended. So for the purposes of this wiki, please consider that text to be: "This is my own work -or- I have permission from the original author and I'm crediting them -or- the content is reasonably expected due to age to be in the public domain." Thanks.<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[TZE VIN Decoding]]
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves|Power Level Valve Rebuild]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

''Please [https://donate.wikimedia.org/w/index.php?title=Special:LandingPage&country=US&uselang=en&utm_medium=spontaneous&utm_source=fr-redir&utm_campaign=spontaneous support] Wikipedia's important work.''

MediaWiki:Upload-form-label-own-work

2024-01-15T17:29:08Z

Bob Crisler: Opened up dialog

This is my own work -or- I have permission from the original author and I'm crediting them -or- the content is reasonably expected due to age to be in the public domain.

MediaWiki:Sidebar

2024-01-15T17:22:17Z

Bob Crisler:

MediaWiki:Sidebar

2024-01-15T17:21:57Z

TZE VIN Decoding

2024-01-15T16:23:34Z

Bob Crisler: Added a pic of motorhomes waiting for their interiors

[[File:Assemblyline.jpg|alt=A line of aerodynamic motorhomes moves toward the camera down a factory assembly line.|none|thumb|800x800px|Motorhomes advance along the GMC assembly line in the mid-1970s. Pontiac, Michigan.]]

== VIN Decoding ==

====== Example TZE165V101234 ======
{| class="wikitable"
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1,234th coach produced for that model year)
|}

== Interior/Exterior Finish Code ==
[[File:Gmc-motorhome-rear-deck-gm.jpg|alt=A line of motorhomes backed up to a raised platform, without their rear panels and with a ramp set into the interior for each coach.|thumb|GMC Motorhomes, with rear caps removed, wait in a line to have their interiors fitted out.]]

====== If the motorhome was furnished with a GMC interior, the Service Parts Identification Label in the glovebox identifies the interior finish model. ======
{| class="wikitable"
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

File:Gmc-motorhome-rear-deck-gm.jpg

2024-01-15T16:20:51Z

Bob Crisler:

GMC Motorhomes wait to receive their interiors at the Pontiac, Michigan factory.

TZE VIN Decoding

2024-01-15T15:56:32Z

Bob Crisler: /* Example TZE165V101234 */ added a missing comma

[[File:Assemblyline.jpg|alt=A line of aerodynamic motorhomes moves toward the camera down a factory assembly line.|none|thumb|800x800px|Motorhomes advance along the GMC assembly line in the mid-1970s. Pontiac, Michigan.]]

== VIN Decoding ==

====== Example TZE165V101234 ======
{| class="wikitable"
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1,234th coach produced for that model year)
|}

== Interior/Exterior Finish Code ==

====== If the motorhome was furnished with a GMC interior, the Service Parts Identification Label in the glovebox identifies the interior finish model. ======
{| class="wikitable"
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

TZE VIN Decoding

2024-01-15T15:55:55Z

Bob Crisler: Fixed a typo

[[File:Assemblyline.jpg|alt=A line of aerodynamic motorhomes moves toward the camera down a factory assembly line.|none|thumb|800x800px|Motorhomes advance along the GMC assembly line in the mid-1970s. Pontiac, Michigan.]]

== VIN Decoding ==

====== Example TZE165V101234 ======
{| class="wikitable"
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1234th coach produced for that model year)
|}

== Interior/Exterior Finish Code ==

====== If the motorhome was furnished with a GMC interior, the Service Parts Identification Label in the glovebox identifies the interior finish model. ======
{| class="wikitable"
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

TZE VIN Decoding

2024-01-15T15:55:13Z

Bob Crisler: Added a photo of GMCs on assembly line

[[File:Assemblyline.jpg|alt=A line of aerodynamic motorhomes moves toward the camera down a factory assembly line.|none|thumb|800x800px|Motorhomes advance along the GMC assembly line in the mid-1970s. Pontiac , Michigan.]]

== VIN Decoding ==

====== Example TZE165V101234 ======
{| class="wikitable"
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1234th coach produced for that model year)
|}

== Interior/Exterior Finish Code ==

====== If the motorhome was furnished with a GMC interior, the Service Parts Identification Label in the glovebox identifies the interior finish model. ======
{| class="wikitable"
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

File:Assemblyline.jpg

2024-01-15T15:51:16Z

Bob Crisler:

Motorhomes advance along the GMC assembly line, Pontiac, Michigan.

Front Suspension

2024-01-15T06:55:13Z

Bob Crisler: Repriced lower ball joint

The front suspension on a GMC Motorhome, like most of the front running gear, is repurposed from the Oldsmobile Unitized Power Package, designed to move the 4,841-pound Toronado around. Some components were beefed up mid-production. Lower control arms are a particular sore point, as the stock Toronado engineering was not up to the task. Later lower control arms in the Motorhome were crudely but effectively reinforced in the area of the lower ball joint; all GMC owners should include these areas as part of regular inspection.

Any suspension is composed of many skeletal metal components, all of which are connected, but isolated, using some combination of bushings, joints, and rubber. If you have any rubber components that are unchanged since yours rolled out of Truck & Coach Plant #29 in Pontiac, they need to be replaced. Note, not "they may need to be replaced." They need to be replaced.

What follows is a list of components and sourcing info necessary to replace all wear parts from the front suspension of your GMC. Source info is from a suspension rebuild in 2018. The list was compiled from the perspective of a cheapskate; some or all prices may have changed. Feel free to amend with new information. Most if not all of these parts can be sourced in a single order from any of the reputable GMC retail suppliers.

{| class="wikitable"
|
|'''Source'''
|'''Price'''
|'''Quantity'''
|'''Subtotal'''
|-
|'''Adjusting Tube Moog ES2004S'''
|RockAuto
|7.13
|2
|14.26
|-
|'''Ball Joint Lower Moog K6215'''
(Beware: K5221 is specified for '69-78 Toronado but uses a smaller stud according to Moog tech support)
|Applied
|153.06
|2
|306.12
|-
|'''Ball Joint Upper Moog K5238'''
|Walmart
|36.50
|2
|73
|-
|'''CV Boots (Outer)'''
|Summit
|9.99
|2
|19.98
|-
|'''Energy Suspension 3.3121 Control Arm Bushings'''
|suspension.com
|76.26
|1
|76.26
|-
|'''Energy Suspension 9.5162R stabilizer bar bushings'''
|Amazon
|19.32
|1
|19.32
|-
|'''Idler Arm 18737'''
|Performance Suspension Tech
|69
|1
|69
|-
|'''Polyurethane end link bushings'''
|Applied
|14.95
|1
|14.95
|-
|'''Shocks KYB KG5435'''
|Amazon/AutoPartsKart
|40.80
|2
|81.6
|-
|'''Steering Damper Moog SSD55'''
|Amazon
|41.78
|1
|41.78
|-
|'''Tie Rod End, Inner, TRE361R'''
|kanter.com
|47.00
|2
|94
|-
|'''Tie Rod End, Outer, Moog ES412RL'''
|WalMart
|34.02
|2
|68.04
|-
|
|
|
|
|'''878.31'''
|}

TZE VIN Decoding

2024-01-15T06:49:15Z

Bob Crisler:

== VIN Decoding ==

====== Example TZE165V101234 ======
{| class="wikitable"
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1234th coach produced for that model year)
|}

== Interior/Exterior Finish Code ==

====== If the motorhome was furnished with a GMC interior, the Service Parts Identification Label in the glovebox identifies the interior finish model. ======
{| class="wikitable"
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

Welcome to the GMC Motorhome Wiki

2024-01-15T06:48:21Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same.*

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[TZE VIN Decoding]]
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves|Power Level Valve Rebuild]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

''Please [https://donate.wikimedia.org/w/index.php?title=Special:LandingPage&country=US&uselang=en&utm_medium=spontaneous&utm_source=fr-redir&utm_campaign=spontaneous support] Wikipedia's important work.''

Welcome to the GMC Motorhome Wiki

2024-01-15T06:47:45Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same.*

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* TZE VIN Decoding
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves|Power Level Valve Rebuild]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

''Please [https://donate.wikimedia.org/w/index.php?title=Special:LandingPage&country=US&uselang=en&utm_medium=spontaneous&utm_source=fr-redir&utm_campaign=spontaneous support] Wikipedia's important work.''

TZE VIN Decoding

2024-01-15T06:46:57Z

Bob Crisler: formatting

== VIN Decoding ==

====== Example TZE165V101234 ======
{| class="wikitable"
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1234th coach produced for that model year)
|}

== Service Parts Identification Label ==

====== If the motorhome was furnished with a GMC interior, this label in the glovebox identifies the interior finish model. ======
{| class="wikitable"
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

TZE VIN Decoding

2024-01-15T06:45:01Z

Bob Crisler: New page describing TZE code

{| class="wikitable"
|+VIN Decoding
Example TZE165V101234
|T
|Manufactured by General Motors
|-
|Z
|3 Axle Motorhome
|-
|E
|Gasoline Engine
|-
|1
|Interior Code

"1" - GM Interior from 1975 to 1978

"0" - GM Interior from 1973 to 1974

"2" - Twin Bed Interior from 1976 to 1977

"3" - Transmode(sold without interior or windows)
|-
|6
|Model
"6" - Model 260(26 feet long)

"3" - Model 230(23 feet long)
|-
|5
|Model Year (1975)
|-
|V
|Manufacturing Plant Code
"V" - Pontiac, Michigan
|-
|1
|First Digit of Production Series Number
All production started with "1"
|-
|0
|Since total production was less than 13,000, all GMC Motorhomes had a zero in this position
|-
|1234
|Production Sequence Number (the 1234th coach produced for that model year)
|}
{| class="wikitable"
|+Service Parts Identification Label
'''''If the motorhome was furnished with a GMC interior, this label in the glovebox identifies the interior finish model.'''''
|641
|Kingsley
|-
|681
|Glenbrook
|-
|683
|Edgemont
|-
|685
|Coca Cola
|-
|690
|Sequoia
|-
|692
|Painted Desert
|-
|693
|Glacier
|-
|695
|Canyon Lands
|-
|696
|Eleganza I
|-
|698
|Palm Beach
|}
Source: What's in a Number? by Dave Greenberg, March 1997

Side Windows

2024-01-09T19:30:11Z

Bob Crisler: added detail

This is an article stub. Feel especially free to add content here.

There are several versions of side windows in the GMC.

Later windows were made by Hehr, an RV window company that continues in business today. Latches may be sourced as a current Hehr product, no. H695.

Glass was PPG Sunshade Herculite, in a 50 percent transmissivity. A 35% ceramic film will result in a total transmissivity of 17.5%. Rejection of the sun's heat can be improved by using a ceramic film; these perform best for blocking heat-producing UV rays.

There are two kinds of glides that are installed in the window extrusion to provide a seal around the glass: flocked rubber and hard plastic. The hard plastic is becoming hard to source; owners have successfully replaced the hard plastic with flocked rubber.

Welcome to the GMC Motorhome Wiki

2024-01-08T05:46:41Z

Bob Crisler:

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same.*

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves|Power Level Valve Rebuild]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

''Please [https://donate.wikimedia.org/w/index.php?title=Special:LandingPage&country=US&uselang=en&utm_medium=spontaneous&utm_source=fr-redir&utm_campaign=spontaneous support] Wikipedia's important work.''

Welcome to the GMC Motorhome Wiki

2024-01-08T05:46:05Z

Bob Crisler: added a link to Wikipedia donation page

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same.*

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves|Power Level Valve Rebuild]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

Please [https://donate.wikimedia.org/w/index.php?title=Special:LandingPage&country=US&uselang=en&utm_medium=spontaneous&utm_source=fr-redir&utm_campaign=spontaneous support] Wikipedia's important work.

Welcome to the GMC Motorhome Wiki

2024-01-08T05:45:20Z

Bob Crisler:

Welcome to the GMC Motorhome Wiki

2024-01-08T05:44:45Z

Bob Crisler:

Welcome to the GMC Motorhome Wiki

2024-01-08T05:42:35Z

Bob Crisler:

Main Page

2024-01-08T05:41:43Z

Bob Crisler: Bob Crisler moved page Main Page to Welcome to the GMC Motorhome Wiki: more meaningful title

#REDIRECT [[Welcome to the GMC Motorhome Wiki]]

Welcome to the GMC Motorhome Wiki

2024-01-08T05:41:43Z

Bob Crisler: Bob Crisler moved page Main Page to Welcome to the GMC Motorhome Wiki: more meaningful title

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves|Power Level Valve Rebuild]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Welcome to the GMC Motorhome Wiki

2024-01-08T05:40:15Z

Bob Crisler: /* Tech Articles */

DIY Gaskets for Leak-Free Power Level Valves

2024-01-08T05:39:30Z

Bob Crisler: Bob Crisler moved page DIY Gaskets for Leak-Free Power Level Valves to Power Level Valve Rebuild: More meaningful/shorter article title

#REDIRECT [[Power Level Valve Rebuild]]

Power Level Valve Rebuild

2024-01-08T05:39:29Z

Bob Crisler: Bob Crisler moved page DIY Gaskets for Leak-Free Power Level Valves to Power Level Valve Rebuild: More meaningful/shorter article title

[[File:DIY Power Level Valve Gasket.pdf|thumb|Printable template to aid in cutting new valve gaskets]]
When I bought my GMC, a 1975 Palm Beach, the Power Level system was not working. The PO had installed cutoff ball valves at each rear wheel set, and leveling was achieved with an air compressor through Schrader valves located at each airbag. It was adequate for a temporary solution, but hardly ideal.

So I decided to take things on, starting at known failure points, focusing on the compressor -- the Dana was shot -- and replacing it with a Viair 480c (that's a different story and a different post), and the Power Level valves. I used Applied GMC's rebuild kit for those valves first, and had partial success. The new O-rings did their job of sealing, as did the valve gaskets, but the Viair is a beast, and after a few days the cork-composite valve body gaskets blew out. IMO that material is just not tough enough, resilient enough, for 120 PSI.

I looked at JR Slaten's Power Level II valves, based on high-quality Swagelok parts, but before spending $500 I thought I'd take another shot at those Power Level valves, as I could easily make my own valve gaskets out of some 1/8" sheet EPDM rubber I had left over from a roofing project.

After weeks now of holding air with nary a peep out of the compressor, I can report that the EPDM gaskets have successfully fixed the original valves. The system has now held with no discernible leakdown for long enough that I can say that it ''does not leak''.

To create the valve gaskets, download the [[:File:DIY Power Level Valve Gasket.pdf|DIY Power Level Gasket PDF]] to use as a guide.

Leather punches from [https://www.harborfreight.com/9-piece-hollow-punch-set-3838.html?utm_source=google&utm_medium=cpc&utm_campaign=17890471891&campaignid=17890471891&utm_content=146321458304&adsetid=146321458304&product=3838&store=&gclid=Cj0KCQjwguGYBhDRARIsAHgRm4-5ja62tu1i3AGsLQwuAAdnTG744KC87LEqjvk9vtIM5DdpJnlIlc4aAtaKEALw_wcB Harbor Freight] provided clean results in the process of creating the holes in the gasket. The perimeter cut can be completed after installation, with a razor blade.

Tooling marks are considerable in these valves. You want to leave some "tooth" in the surface to assist in keeping the gasket in place. But mine were excessively scored. Light sanding may be advisable. Optionally, lightly grease both sealing surfaces with Permatex 51813 Anaerobic Gasket Maker.

Torque Torx-head bolts joining the two sides of the valve snug but don't go nuts (remember, you're holding 120 PSI, so "snug" means that the rubber is compressed adequately to seal against those imperfect surfaces).

Note: Several openings in the downloadable gasket template are intentionally undersized to help the gasket retain shape and remain in place over the sealing surfaces; these openings are still larger than inside diameter of airlines, and therefore do not add any restriction.

'''Additionally ...'''

I replaced the lines between the Power Level valves and the butt connectors in the engine compartment, cutting an additional two inches or so -- carefully, with a tool specially made for cutting airlines -- from the old lines to create a new sealing surface for the O-rings in the Prestoloks. New Parker Prestolok butt connectors (32PLP-4) along with a Y-connector (362PLP-4) for the main air supply located immediately behind the valves were purchased, along with new color-coded 1120-series airline tubing from the valves to the butt connectors. [https://www.partsgopher.com/products?Filter=3312.1120-series-tubing/department.hose-fittings/product-type.tubing/outer-diameter.1-4-inch PartsGopher.com] was the best vendor I was able to find for this tubing in short lengths. I went with 4 feet per line, but 3 would be fine. I also changed the tubing connectors on the valve bodies themselves to Parker Prestolok, purchased at my local Parker Store; I'll edit this to include the model number.

Refrigerators

2024-01-08T02:21:20Z

Bob Crisler:

The subject of refrigerators for the GMC is a well-traveled one. There are two basic options: absorption refrigerators, which depend on a heat source, usually propane, to initiate a liquid/gas cycle using ammonia in a spiral tube, and compression refrigerators, which use a compressor to sustain a vapor compression cycle. Typically, an absorption apparatus is considerably larger than a comparable-capacity compression system, and in an equivalently-sized compartment, that space has to come from somewhere, and that somewhere is the refrigerator box. Absorption refrigerators, as a rule, have less usable capacity than compression refrigerators.
{| class="wikitable"
|+Propane, 12 volt or 120 volt ... Pros/Cons
!
!Absorption
!12v Compressor
!120v AC with inverter
|-
|efficiency
|most efficient on propane heat source
|most efficient with modern Danfoss (or knockoff) compressors
|Can be fairly efficient while compressor is running; inverter use involves some continual phantom power loss.
|-
|energy source
|some ("three way" or "two way") have an option for a resistive electric heat source. 120 volt only practical for
|12 volts, less than 10 amps
|dedicated or whole-house inverter running off 12 volt house
|-
|expense
|
|approximately equivalent to 3-way RV refrigerator pricing
|cheapest by far, but electrically inefficient, with waste power from inverter even when compressor is off.
|-
|safety
|potential fire hazard; many RV fires are reported to start in refrigerator compartment
|no issues known
|no issues known
|-
|use restriction
|not legal in many states to run on propane while underway; will not work at any tilt above 3-5 degrees.
|no restrictions; most can operate at extreme angles, certainly any that might be encountered on a mountain road
|no restrictions; most can operate at extreme angles, certainly any that might be encountered on a mountain road
|-
|modes
|Propane or 120 volt, usually switchable at front panel. 12 volt not typically used.
|Always 12 volt, running or stopped
|When connected to shore power, should be powered directly by 120 volt AC source through a transfer switch.
|}
There are those who swear by their propane-fueled absorption refrigerators, and there are those who swear at them. In the best of cases, an absorption refrigerator takes the better part of a day to get to temperature, and once there it takes a while to recover if the door is opened. There is a reason we don't use absorption refrigerators in the home ... they're just not competitive with compressor-cycle fridges in any area of performance, and they are a potential fire hazard. Even moreso in a moving RV. They compromise the overall heating and cooling of the RV because they must vent to open air. In short, because the efficient 12 volt compressor refrigerator has come of age, and high-capacity LifePo4 batteries are readily available, along with affordable solar, there are few reasons left to choose an absorption fridge.

==== 12-volt Refrigerators ====
Several 12-volt refrigerators are recommended by the GMC community. None fit the existing space in a standard GMC-built interior better than the Norcold N8DC, though. This model has been observed to pull a maximum of 5 amps while the compressor is in operation. Once cool, in a comfortable interior and with the old absorption air vents sealed, the N8DC can be expected to cycle about 1/4 to 1/3 of the time, consuming at most 40 amp hours per day. Vitrifrigo also makes a competitive model.

==== Wiring ====
The existing 12-volt circuit running to the refrigerator compartment of a GMC is 12 awg wire, capable of sustaining 10 amps over a 16-foot run. A Norcold N8DC pulls considerably less than that; for peace of mind, this circuit can be fused at 10 amps without issue. If you're going the route of running a dedicated inverter to power a 120 volt compressor fridge, you may find that your compartment is already supplied with a 120 volt AC circuit; a larger inverter can supply that circuit, or you can run dedicated 10 gauge 12 volt wiring to the refrigerator compartment; 25 amps can power a 300-watt AC inverter, providing enough power to run some apartment-size refrigerator models.

==== Sources ====
If you're open to scratch and dent refrigerators that may require cosmetic repair, [https://fixyourfridge.com/scratch-dent-pricing/ National RV Refrigeration] in Shipsewana, Indiana has a solid reputation in the GMC community.

Welcome to the GMC Motorhome Wiki

2024-01-08T01:17:15Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves]]
* [[Refrigerators]]
* [[Front Suspension]]
* [[Side Windows]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Welcome to the GMC Motorhome Wiki

2024-01-08T01:17:01Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves]]
* [[Refrigerator]]<nowiki/>s
* [[Front Suspension]]
* [[Side Windows]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Welcome to the GMC Motorhome Wiki

2024-01-08T01:16:27Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[DIY Gaskets for Leak-Free Power Level Valves]]
* [[Refrigerator]]
* [[Front Suspension]]
* [[Side Windows]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Side Windows

2024-01-08T01:14:43Z

Bob Crisler:

This is an article stub. Feel especially free to add content here.

There are several versions of side windows in the GMC.

Later windows were made by Hehr, an RV window company that continues in business today.

Glass was PPG Sunshade Herculite, in a 50 percent transmissivity. A 35% ceramic film will result in a total transmissivity of 17.5%. Rejection of the sun's heat can be improved by using a ceramic film; these perform best for blocking heat-producing UV rays.

Welcome to the GMC Motorhome Wiki

2024-01-08T01:14:13Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[Refrigerator]]
* [[Front Suspension]]
* [[Side Windows]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Welcome to the GMC Motorhome Wiki

2024-01-08T01:13:52Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[Refrigerator]]
* [[Front Suspension]]
* Side Windows

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Side Windows

2024-01-08T01:12:49Z

Bob Crisler: Just minor copy improvements

There are several versions of side windows in the GMC.

Later windows were made by Hehr, an RV window company that continues in business today.

Glass was PPG Sunshade Herculite, in a 50 percent transmissivity. A 35% ceramic film will result in a total transmissivity of 17.5%. Rejection of the sun's heat can be improved by using a ceramic film; these perform best for blocking heat-producing UV rays.

Welcome to the GMC Motorhome Wiki

2024-01-08T01:09:30Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[Refrigerator]]
* [[Front Suspension]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Welcome to the GMC Motorhome Wiki

2024-01-08T00:44:56Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[Refrigerator]]
* [[Front Suspension]]
* [[Testing]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Welcome to the GMC Motorhome Wiki

2024-01-02T20:40:47Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

To contribute, you don't need an account, even. But please create one so that your work is credited.

Consult the [https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents User's Guide] for information on using the wiki software.

Be good, do good, and take good care of your TZE.

===Create a New Article===

<inputbox>
type=create
width=100
break=no
buttonlabel=Do It. Do It Now.
default=Type your article title here.
</inputbox>

Bob C.

== Tech Articles ==
* [[GMC Motorhome Dimensions]]
* [[House Batteries]]
* [[Refrigerator]]
* [[Front Suspension]]

== Getting started ==
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Configuration_settings Configuration settings list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:FAQ MediaWiki FAQ]
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Localisation#Translation_resources Localise MediaWiki for your language]
* [https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Combating_spam Learn how to combat spam on your wiki]

Front Suspension

2024-01-02T20:40:15Z

Bob Crisler: Bob Crisler moved page Front Suspension (Stock) to Front Suspension without leaving a redirect: had parens in the title, which seems to throw an error.

The front suspension on a GMC Motorhome, like most of the front running gear, is repurposed from the Oldsmobile Unitized Power Package, designed to move the 4,841-pound Toronado around. Some components were beefed up mid-production. Lower control arms are a particular sore point, as the stock Toronado engineering was not up to the task. Later lower control arms in the Motorhome were crudely but effectively reinforced in the area of the lower ball joint; all GMC owners should include these areas as part of regular inspection.

Any suspension is composed of many skeletal metal components, all of which are connected, but isolated, using some combination of bushings, joints, and rubber. If you have any rubber components that are unchanged since yours rolled out of Truck & Coach Plant #29 in Pontiac, they need to be replaced. Note, not "they may need to be replaced." They need to be replaced.

What follows is a list of components and sourcing info necessary to replace all wear parts from the front suspension of your GMC. Source info is from a suspension rebuild in 2018. The list was compiled from the perspective of a cheapskate; some or all prices may have changed. Feel free to amend with new information. Most if not all of these parts can be sourced in a single order from any of the reputable GMC retail suppliers.

{| class="wikitable"
|
|'''Source'''
|'''Price'''
|'''Quantity'''
|'''Subtotal'''
|-
|'''Adjusting Tube Moog ES2004S'''
|RockAuto
|7.13
|2
|14.26
|-
|'''Ball Joint Lower Moog K6215'''
(this is the old part number; K5221 is specified for '69-78 Toronado but uses a smaller stud according to Moog tech support)
|JEGS
|72.99
|2
|145.98
|-
|'''Ball Joint Upper Moog K5238'''
|Walmart
|36.50
|2
|73
|-
|'''CV Boots (Outer)'''
|Summit
|9.99
|2
|19.98
|-
|'''Energy Suspension 3.3121 Control Arm Bushings'''
|suspension.com
|76.26
|1
|76.26
|-
|'''Energy Suspension 9.5162R stabilizer bar bushings'''
|Amazon
|19.32
|1
|19.32
|-
|'''Idler Arm 18737'''
|Performance Suspension Tech
|69
|1
|69
|-
|'''Polyurethane end link bushings'''
|Applied
|14.95
|1
|14.95
|-
|'''Shocks KYB KG5435'''
|Amazon/AutoPartsKart
|40.80
|2
|81.6
|-
|'''Steering Damper Moog SSD55'''
|Amazon
|41.78
|1
|41.78
|-
|'''Tie Rod End, Inner, TRE361R'''
|kanter.com
|47.00
|2
|94
|-
|'''Tie Rod End, Outer, Moog ES412RL'''
|WalMart
|34.02
|2
|68.04
|-
|
|
|
|
|'''718.17'''
|}

Welcome to the GMC Motorhome Wiki

2024-01-02T20:14:44Z

Bob Crisler: /* Tech Articles */

Welcome to the GMC Motorhome Wiki. If you're familiar with Wikipedia, this is based on the same software that Wikipedia is based on; it works just the same. Please support Wikipedia's important work.

The GMC Motorhome Wiki is intended to be an all-purpose site for accumulating the knowledge of the GMC community. If it becomes significant, and there is interest, control and ownership will be ceded to a voluntary board so that my immediate promise to maintain it can be made fully sustainable.

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== Tech Articles ==
* [[GMC Motorhome Dimensions]]
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* [[Front Suspension (Stock)]]

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Power Level Valve Rebuild

2022-09-07T23:21:47Z

Bob Crisler:

[[File:DIY Power Level Valve Gasket.pdf|thumb|Printable template to aid in cutting new valve gaskets]]
When I bought my GMC, a 1975 Palm Beach, the Power Level system was not working. The PO had installed cutoff ball valves at each rear wheel set, and leveling was achieved with an air compressor through Schrader valves located at each airbag. It was adequate for a temporary solution, but hardly ideal.

So I decided to take things on, starting at known failure points, focusing on the compressor -- the Dana was shot -- and replacing it with a Viair 480c (that's a different story and a different post), and the Power Level valves. I used Applied GMC's rebuild kit for those valves first, and had partial success. The new O-rings did their job of sealing, as did the valve gaskets, but the Viair is a beast, and after a few days the cork-composite valve body gaskets blew out. IMO that material is just not tough enough, resilient enough, for 120 PSI.

I looked at JR Slaten's Power Level II valves, but before spending $500 I thought I'd take another shot at those Power Level valves, as I could easily make my own valve gaskets out of some 1/8" sheet EPDM rubber I had left over from a roofing project.

The system has now held with no discernible leakdown for weeks; the compressor rarely runs.

To create the valve gaskets, download the [[:File:DIY Power Level Valve Gasket.pdf|DIY Power Level Gasket PDF]] to use as a guide.

Leather punches from [https://www.harborfreight.com/9-piece-hollow-punch-set-3838.html?utm_source=google&utm_medium=cpc&utm_campaign=17890471891&campaignid=17890471891&utm_content=146321458304&adsetid=146321458304&product=3838&store=&gclid=Cj0KCQjwguGYBhDRARIsAHgRm4-5ja62tu1i3AGsLQwuAAdnTG744KC87LEqjvk9vtIM5DdpJnlIlc4aAtaKEALw_wcB Harbor Freight] provided clean results in the process of creating the holes in the gasket. The perimeter cut can be completed after installation, with a razor blade.

Tooling marks are considerable in these valves. You want to leave some "tooth" in the surface to assist in keeping the gasket in place. But mine were excessively scored. Light sanding may be advisable. Optionally, lightly grease both sealing surfaces with Permatex 51813 Anaerobic Gasket Maker.

Torque Torx-head bolts joining the two sides of the valve snug but don't go nuts (remember, you're holding 120 PSI).

Note: Several openings in the downloadable gasket template are intentionally undersized to help the gasket retain shape and remain in place over the sealing surfaces; these openings are still larger than inside diameter of airlines, and therefore do not add any restriction.

'''Additionally ...'''

I replaced the lines between the Power Level valves and the butt connectors in the engine compartment, cutting an additional two inches or so -- carefully, with a tool specially made for cutting airlines -- from the old lines to create a new sealing surface for the O-rings in the Prestoloks. New Parker Prestolok butt connectors (32PLP-4) along with a Y-connector (362PLP-4) for the main air supply located immediately behind the valves were purchased, along with new color-coded 1120-series airline tubing from the valves to the butt connectors. [https://www.partsgopher.com/products?Filter=3312.1120-series-tubing/department.hose-fittings/product-type.tubing/outer-diameter.1-4-inch PartsGopher.com] was the best vendor I was able to find for this tubing in short lengths. I went with 4 feet per line, but 3 would be fine. I also changed the tubing connectors on the valve bodies themselves to Parker Prestolok, purchased at my local Parker Store; I'll edit this to include the model number.

Power Level Valve Rebuild

2022-09-07T23:20:42Z

Bob Crisler:

[[File:DIY Power Level Valve Gasket.pdf|thumb|Printable template to aid in cutting new valve gaskets]]
When I bought my GMC, a 1975 Palm Beach, the Power Level system was not working. The PO had installed cutoff ball valves at each rear wheel set, and leveling was achieved with an air compressor through Schrader valves located at each airbag. It was adequate for a temporary solution, but hardly ideal.

So I decided to take things on, starting at known failure points, focusing on the compressor -- the Dana was shot -- and replacing it with a Viair 480c (that's a different story and a different post), and the Power Level valves. I used Applied GMC's rebuild kit for those valves first, and had partial success. The new O-rings did their job of sealing, as did the valve gaskets, but the Viair is a beast, and after a few days the cork-composite valve body gaskets blew out. IMO that material is just not tough enough, resilient enough, for 120 PSI.

I looked at JR Slaten's Power Level II valves, but before spending $500 I thought I'd take another shot at those Power Level valves, as I could easily make my own valve gaskets out of some 1/8" sheet EPDM rubber I had left over from a roofing project.

The system has now held with no discernible leakdown for weeks; the compressor rarely runs.

To create the valve gaskets, download the [[:File:DIY Power Level Valve Gasket.pdf|DIY Power Level Gasket PDF]] to use as a guide.

Leather punches from [https://www.harborfreight.com/9-piece-hollow-punch-set-3838.html?utm_source=google&utm_medium=cpc&utm_campaign=17890471891&campaignid=17890471891&utm_content=146321458304&adsetid=146321458304&product=3838&store=&gclid=Cj0KCQjwguGYBhDRARIsAHgRm4-5ja62tu1i3AGsLQwuAAdnTG744KC87LEqjvk9vtIM5DdpJnlIlc4aAtaKEALw_wcB Harbor Freight] provided clean results in the process of creating the holes in the gasket. The perimeter cut can be completed after installation, with a razor blade.

Tooling marks are considerable in these valves. You want to leave some "tooth" in the surface to assist in keeping the gasket in place. But mine were excessively scored. Light sanding may be advisable. Optionally, lightly grease both sealing surfaces with Permatex 51813 Anaerobic Gasket Maker.

Torque Torx-head bolts joining the two sides of the valve snug but don't go nuts (remember, you're holding up 120 PSI).

Several openings in the downloadable gasket template are intentionally undersized to help the gasket retain shape and remain in place over the sealing surfaces; these openings are still larger than inside diameter of airlines, and therefore do not add any restriction.

'''Additionally ...'''

I replaced the lines between the Power Level valves and the butt connectors in the engine compartment, cutting an additional two inches or so -- carefully, with a tool specially made for cutting airlines -- from the old lines to create a new sealing surface for the O-rings in the Prestoloks. New Parker Prestolok butt connectors (32PLP-4) along with a Y-connector (362PLP-4) for the main air supply located immediately behind the valves were purchased, along with new color-coded 1120-series airline tubing from the valves to the butt connectors. [https://www.partsgopher.com/products?Filter=3312.1120-series-tubing/department.hose-fittings/product-type.tubing/outer-diameter.1-4-inch PartsGopher.com] was the best vendor I was able to find for this tubing in short lengths. I went with 4 feet per line, but 3 would be fine. I also changed the tubing connectors on the valve bodies themselves to Parker Prestolok, purchased at my local Parker Store; I'll edit this to include the model number.

Power Level Valve Rebuild

2022-09-07T23:19:23Z

Bob Crisler:

[[File:DIY Power Level Valve Gasket.pdf|thumb|Printable template to aid in cutting new valve gaskets]]
When I bought my GMC, a 1975 Palm Beach, the Power Level system was not working. The PO had installed cutoff ball valves at each rear wheel set, and leveling was achieved with an air compressor through Schrader valves located at each airbag. It was adequate for a temporary solution, but hardly ideal.

So I decided to take things on, starting at known failure points, focusing on the compressor -- the Dana was shot -- and replacing it with a Viair 480c (that's a different story and a different post), and the Power Level valves. I used Applied GMC's rebuild kit for those valves first, and had partial success. The new O-rings did their job of sealing, as did the valve gaskets, but the Viair is a beast, and after a few days the cork-composite valve body gaskets blew out. IMO that material is just not tough enough, resilient enough, for 120 PSI.

I looked at JR Slaten's Power Level II valves, but before spending $500 I thought I'd take another shot at those Power Level valves, as I could easily make my own valve gaskets out of some 1/8" sheet EPDM rubber I had left over from a roofing project.

The system has now held with no discernible leakdown for weeks; the compressor rarely runs.

To create the valve gaskets, download the [[Index.php?title=File:DIY Power Level Gasket PDF|DIY Power Level Gasket PDF]] to use as a guide.

Leather punches from [https://www.harborfreight.com/9-piece-hollow-punch-set-3838.html?utm_source=google&utm_medium=cpc&utm_campaign=17890471891&campaignid=17890471891&utm_content=146321458304&adsetid=146321458304&product=3838&store=&gclid=Cj0KCQjwguGYBhDRARIsAHgRm4-5ja62tu1i3AGsLQwuAAdnTG744KC87LEqjvk9vtIM5DdpJnlIlc4aAtaKEALw_wcB Harbor Freight] provided clean results in the process of creating the holes in the gasket. The perimeter cut can be completed after installation, with a razor blade.

Tooling marks are considerable in these valves. You want to leave some "tooth" in the surface to assist in keeping the gasket in place. But mine were excessively scored. Light sanding may be advisable. Optionally, lightly grease both sealing surfaces with Permatex 51813 Anaerobic Gasket Maker.

Torque Torx-head bolts joining the two sides of the valve snug but don't go nuts (remember, you're holding up 120 PSI).

Several openings in the downloadable gasket template are intentionally undersized to help the gasket retain shape and remain in place over the sealing surfaces; these openings are still larger than inside diameter of airlines, and therefore do not add any restriction.

'''Additionally ...'''

I replaced the lines between the Power Level valves and the butt connectors in the engine compartment, cutting an additional two inches or so -- carefully, with a tool specially made for cutting airlines -- from the old lines to create a new sealing surface for the O-rings in the Prestoloks. New Parker Prestolok butt connectors (32PLP-4) along with a Y-connector (362PLP-4) for the main air supply located immediately behind the valves were purchased, along with new color-coded 1120-series airline tubing from the valves to the butt connectors. [https://www.partsgopher.com/products?Filter=3312.1120-series-tubing/department.hose-fittings/product-type.tubing/outer-diameter.1-4-inch PartsGopher.com] was the best vendor I was able to find for this tubing in short lengths. I went with 4 feet per line, but 3 would be fine. I also changed the tubing connectors on the valve bodies themselves to Parker Prestolok, purchased at my local Parker Store; I'll edit this to include the model number.

Power Level Valve Rebuild

2022-09-07T23:18:21Z

Bob Crisler: Added a link to the PDF

[[File:DIY Power Level Valve Gasket.pdf|thumb|Printable template to aid in cutting new valve gaskets]]
When I bought my GMC, a 1975 Palm Beach, the Power Level system was not working. The PO had installed cutoff ball valves at each rear wheel set, and leveling was achieved with an air compressor through Schrader valves located at each airbag. It was adequate for a temporary solution, but hardly ideal.

So I decided to take things on, starting at known failure points, focusing on the compressor -- the Dana was shot -- and replacing it with a Viair 480c (that's a different story and a different post), and the Power Level valves. I used Applied GMC's rebuild kit for those valves first, and had partial success. The new O-rings did their job of sealing, as did the valve gaskets, but the Viair is a beast, and after a few days the cork-composite valve body gaskets blew out. IMO that material is just not tough enough, resilient enough, for 120 PSI.

I looked at JR Slaten's Power Level II valves, but before spending $500 I thought I'd take another shot at those Power Level valves, as I could easily make my own valve gaskets out of some 1/8" sheet EPDM rubber I had left over from a roofing project.

The system has now held with no discernible leakdown for weeks; the compressor rarely runs.

To create the valve gaskets, download the [[DIY Power Level Gasket PDF]] to use as a guide.

Leather punches from [https://www.harborfreight.com/9-piece-hollow-punch-set-3838.html?utm_source=google&utm_medium=cpc&utm_campaign=17890471891&campaignid=17890471891&utm_content=146321458304&adsetid=146321458304&product=3838&store=&gclid=Cj0KCQjwguGYBhDRARIsAHgRm4-5ja62tu1i3AGsLQwuAAdnTG744KC87LEqjvk9vtIM5DdpJnlIlc4aAtaKEALw_wcB Harbor Freight] provided clean results in the process of creating the holes in the gasket. The perimeter cut can be completed after installation, with a razor blade.

Tooling marks are considerable in these valves. You want to leave some "tooth" in the surface to assist in keeping the gasket in place. But mine were excessively scored. Light sanding may be advisable. Optionally, lightly grease both sealing surfaces with Permatex 51813 Anaerobic Gasket Maker.

Torque Torx-head bolts joining the two sides of the valve snug but don't go nuts (remember, you're holding up 120 PSI).

Several openings in the downloadable gasket template are intentionally undersized to help the gasket retain shape and remain in place over the sealing surfaces; these openings are still larger than inside diameter of airlines, and therefore do not add any restriction.

'''Additionally ...'''

I replaced the lines between the Power Level valves and the butt connectors in the engine compartment, cutting an additional two inches or so -- carefully, with a tool specially made for cutting airlines -- from the old lines to create a new sealing surface for the O-rings in the Prestoloks. New Parker Prestolok butt connectors (32PLP-4) along with a Y-connector (362PLP-4) for the main air supply located immediately behind the valves were purchased, along with new color-coded 1120-series airline tubing from the valves to the butt connectors. [https://www.partsgopher.com/products?Filter=3312.1120-series-tubing/department.hose-fittings/product-type.tubing/outer-diameter.1-4-inch PartsGopher.com] was the best vendor I was able to find for this tubing in short lengths. I went with 4 feet per line, but 3 would be fine. I also changed the tubing connectors on the valve bodies themselves to Parker Prestolok, purchased at my local Parker Store; I'll edit this to include the model number.