Home » Public Forums » GMCnet » Cab support failure
| Cab support failure [message #328748] |
Thu, 01 February 2018 14:10  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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One of my cab supports has a broken leg.
Those of us that have spent a lot of time in the "engine room" of GMC know of the three legged support that goes from the cab floor to an isolator on the frame. I had never noticed any problem here, but when pulling the front frame yesterday, I have found a problem. At that time the assembly was rolling nicely, when I noticed something wrong. The A/C clutch had carried along an unrecognized piece of aluminum.
That piece was discovered to be one of the legs of the right side cab support. Quite specifically the one the leans into the engine space. It appears to be a part of the welded aluminum structure. It also shows a lot of wear on the surface that was supposed to be a part of the cab floor structure.
Plan to repair is undetermined at this time, but if anybody has any experience here, I would love to hear about it.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Cab support failure [message #328755 is a reply to message #328748] |
Thu, 01 February 2018 17:30  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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With that repaired and a new body mount in place she should have that new car feel restored.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Cab support failure [message #328760 is a reply to message #328759] |
Thu, 01 February 2018 22:39 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Jim,
I'm at the re-hab hospital twiddling my thumbs in between sessions with the physio terrorists working on my shoulder so I figgered
I'd give Matt a hand.
Reference Parts Book 78Z / Section 23 - Body / Page 23-2 / Figure 23-005 - Front Body, Cowl and Dash / Key 17 & 18.
Key: 17
P/N: 2001709
Description: SUPPORT ASSY - floor to body mounting RH (prior to Serial No. 6V100878) (repl. 698131)
Key: 18
P/N; 2001708
Description: SUPPORT ASSY - floor to body mounting LH (prior to Serial No. 6V100878) (repl. 698132)
Reference Maintenance Manual X-7525 / Section 2 - General Information / Page 1 / Figure 2 - Vehicle Identification Number
6 = 1976
V = Assembly Plant - Pontiac
100878 = Sequential Number
Therefore the "tripod" support was replaced with the formed support in 1976 starting with GMC S/N 100878.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Jim Kanomata
Sent: Friday, February 2, 2018 3:00 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Cab support failure
Matt,
Please explain what years this support design is on. There are lot of people that will be looking for this when they have a newer
units. It is a good idea to inspect the newer ones with the formed Aluminum mount.
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Cab support failure [message #328761 is a reply to message #328759] |
Thu, 01 February 2018 22:46 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Rob,
Hope your going to be able to esape from there.
Take care, and thank you for your complete explanaton.
On Thu, Feb 1, 2018 at 8:39 PM, Rob Mueller wrote:
> Jim,
>
> I'm at the re-hab hospital twiddling my thumbs in between sessions with
> the physio terrorists working on my shoulder so I figgered
> I'd give Matt a hand.
>
> Reference Parts Book 78Z / Section 23 - Body / Page 23-2 / Figure 23-005 -
> Front Body, Cowl and Dash / Key 17 & 18.
>
> Key: 17
> P/N: 2001709
> Description: SUPPORT ASSY - floor to body mounting RH (prior to Serial No.
> 6V100878) (repl. 698131)
>
> Key: 18
> P/N; 2001708
> Description: SUPPORT ASSY - floor to body mounting LH (prior to Serial No.
> 6V100878) (repl. 698132)
>
> Reference Maintenance Manual X-7525 / Section 2 - General Information /
> Page 1 / Figure 2 - Vehicle Identification Number
>
> 6 = 1976
> V = Assembly Plant - Pontiac
> 100878 = Sequential Number
>
> Therefore the "tripod" support was replaced with the formed support in
> 1976 starting with GMC S/N 100878.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Jim
> Kanomata
> Sent: Friday, February 2, 2018 3:00 PM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Cab support failure
>
> Matt,
> Please explain what years this support design is on. There are lot of
> people that will be looking for this when they have a newer
> units. It is a good idea to inspect the newer ones with the formed
> Aluminum mount.
>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Cab support failure [message #328762 is a reply to message #328751] |
Fri, 02 February 2018 09:33 |
Justin Brady
Messages: 769
Registered: April 2015
Location: Bell Buckle, TN
Karma: 11
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Senior Member |
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Gotcha,
If that were the case (having not seen the break) I would probably use a structural epoxy (jb weld or better) and then attach a spanner plate across the repair and rivet or bolt it in place.
No risk of burning down he coach and it would be plenty strong.
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455
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| Re: [GMCnet] Cab support failure [message #328763 is a reply to message #328751] |
Fri, 02 February 2018 10:42 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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Matt, I would consider welding a properly shaped gusset to the bar while
off the coach, and the fastening the gusset to the aluminum cockpit frame
with screws. I used splice plates held with high-strength self-driving
screws to attach the rear body tub when I replaced the Adobe Posterior.
Then you can weld the lower point, which would be harder to fasten with
screwed connections.
Rick “who usually seeks the no-welding solution” Denney
On Thu, Feb 1, 2018 at 4:03 PM Matt Colie wrote:
> Justin Brady wrote on Thu, 01 February 2018 15:49
>> If It's a clean break I would just TIG it back in and maybe add a gusset
> while I was there welding.
>
>
> Justin,
>
> As good an idea as that is, The coach is in my barn and I sold off the
> SigmArk years ago.
> I could weld the bottom with my torch (yes, I did used to weld Al with an
> O2-C2H2 torch) but up against the plywood floor might not have a good
> result. I know what I would have charged to do this as a traveling welder
> and that is why I am evaluating cold repairs intently.
>
> Matt
>
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: [GMCnet] Cab support failure [message #328769 is a reply to message #328763] |
Fri, 02 February 2018 16:10 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Drive it to a welder and spend the money to have it welded with an aluminum
wire feed. Probably charge you the minimum labor charge of $50-$100. Tig
welding probably not the best platform considering access/ cleanliness.
Sully
77 eleganza 2
Bellevue
On Fri, Feb 2, 2018 at 8:42 AM Richard Denney wrote:
> Matt, I would consider welding a properly shaped gusset to the bar while
> off the coach, and the fastening the gusset to the aluminum cockpit frame
> with screws. I used splice plates held with high-strength self-driving
> screws to attach the rear body tub when I replaced the Adobe Posterior.
>
> Then you can weld the lower point, which would be harder to fasten with
> screwed connections.
>
> Rick “who usually seeks the no-welding solution” Denney
>
> On Thu, Feb 1, 2018 at 4:03 PM Matt Colie wrote:
>
>> Justin Brady wrote on Thu, 01 February 2018 15:49
>>> If It's a clean break I would just TIG it back in and maybe add a
> gusset
>> while I was there welding.
>>
>>
>> Justin,
>>
>> As good an idea as that is, The coach is in my barn and I sold off the
>> SigmArk years ago.
>> I could weld the bottom with my torch (yes, I did used to weld Al with an
>> O2-C2H2 torch) but up against the plywood floor might not have a good
>> result. I know what I would have charged to do this as a traveling
> welder
>> and that is why I am evaluating cold repairs intently.
>>
>> Matt
>>
>> --
>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>> Electronically Controlled Quiet Engine Cooling Fan
>> OE Rear Drum Brakes with Applied Control Arms
>> SE Michigan - Twixt A2 and Detroit
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Rick Denney
> 73 x-Glacier 230 "Jaws"
> Off-list email to rick at rickdenney dot com
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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