Home » Public Forums » GMCnet » Upper control arm bolts
| Upper control arm bolts [message #207110] |
Tue, 07 May 2013 22:30  |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Anyone know of a real reason to install the offset bolts on the upper control arms in the same direction they were installed from the factory? The front bolt was installed from the rear with the nut toward the bumper Its a real pain to install the front ones from the rear rather than just installing them from the front with the nut toward the shock mount. Any thoughts? Thanks,Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: Upper control arm bolts [message #207117 is a reply to message #207110] |
Wed, 08 May 2013 05:57  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Sir: what part of the world are you in?
| Hal StClair wrote on Tue, 07 May 2013 23:30 |
Anyone know of a real reason to install the offset bolts on the upper control arms in the same direction they were installed from the factory? The front bolt was installed from the rear with the nut toward the bumper Its a real pain to install the front ones from the rear rather than just installing them from the front with the nut toward the shock mount. Any thoughts? Thanks,Hal
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Upper control arm bolts [message #207127 is a reply to message #207122] |
Wed, 08 May 2013 08:40 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
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Steve, Forgot to add engineers design it, and bean counters make it cheap. Cost of labor and part design is a major consideration. Sometimes easy to build equals hard to repair. Just my drift.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Upper control arm bolts [message #207170 is a reply to message #207110] |
Wed, 08 May 2013 14:35 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Thanks for the replies Guy's, it pretty much followed my thinking but sometimes I overlook the obvious.
I officially live in Rio Rancho,NM but also have a place in Henderson, NV so split a lot of my time between them. We also do a lot of traveling in our converted bus since retiring 4 years ago.
I looked for a way to edit my signature but haven't figured it out yet-not too computer literate I'm afraid.
I do enjoy reading this forum and do appreciate the responces from everyone.
Thanks again, Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] Upper control arm bolts [message #207240 is a reply to message #207122] |
Thu, 09 May 2013 11:03 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| Steven Ferguson wrote on Wed, 08 May 2013 05:41 |
One thing you can always rely on Hal is that the factory only did things the quickest way possible, which, was usually the easiest.
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When applying this line of thought, keep in mind some of the assemblies were a LOT more assessable at the factory during the assembly.
IE: The frame, suspension and drive train assembled and THEN mated to the body. Or the dash was completed before the windshields were installed.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: Upper control arm bolts [message #207256 is a reply to message #207110] |
Thu, 09 May 2013 13:49 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
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Rob,
Not sure what was done in the GMC days, but nowadays (and probably back then as well) alignment isn't really "set" unless something goes wrong in the process. They get "net build" and use quality checks to make sure things stay where they belong. Through either brute force, or careful measuring and engineering, correlation tables are set up that might translate to something like, assemble the left and right torsion bar screws to 6 turns or whatever in. Put the front alignment cam at 2 o'clock and the rear one at 3 o'clock. Then, at the end of the line, while moving over a pit, the alignment is checked to be sure it is in spec. On a slow moving motorhome line, they might have time to adjust it, but often if it's wrong, they will pull the vehicle off-line to the repair area to adjust. That's expensive, so if more than a vehicle or two is off, statistical process control is used to find out why, and if necessary, fixtures are adjusted, or the correlation tables are changed to bring things back in line. This is a marketing guys description of the process, our Wentzville, MO GMC member could fill in lots more details.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Upper control arm bolts [message #207263 is a reply to message #207256] |
Thu, 09 May 2013 15:33 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Craig,
What you note makes sense, however, as you noted; "Then, at the end of the line, while moving over a pit, the alignment is checked
to be sure it is in spec."
At that point it would make sense to check the ride height before checking the alignment would it not?
Regards,
Rob M.
-----Original Message-----
From: Craig Lechowicz
Rob,
Not sure what was done in the GMC days, but nowadays (and probably back then as well) alignment isn't really "set" unless something
goes wrong in the process. They get "net build" and use quality checks to make sure things stay where they belong. Through either
brute force, or careful measuring and engineering, correlation tables are set up that might translate to something like, assemble
the left and right torsion bar screws to 6 turns or whatever in. Put the front alignment cam at 2 o'clock and the rear one at 3
o'clock. Then, at the end of the line, while moving over a pit, the alignment is checked to be sure it is in spec. On a slow
moving motorhome line, they might have time to adjust it, but often if it's wrong, they will pull the vehicle off-line to the repair
area to adjust. That's expensive, so if more than a vehicle or two is off, statistical process control is used to find out why, and
if necessary, fixtures are adjusted, or the correlation tables are changed
to bring things back in line. This is a marketing guys description of the process, our Wentzville, MO GMC member could fill in
lots more details.
--
Craig
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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: Upper control arm bolts [message #207265 is a reply to message #207110] |
Thu, 09 May 2013 16:05 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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Rob,
It does make sense, and because of the GMC's air suspension system, they may even have done it. I do remember when the "pre-production" S10 Blazers and S-Jimmy's came out in 1995, the only person who notice they were close to 2" too high in the back was our chief designer, who knew from working the styling models they just didn't look "right". The leaf spring supplier wasn't initially very good at getting the arch right in the rear leafs, and apparently it never got checked anywhere. Paul Winger who does all the alignment stuff at Wentzville will know the real story on how that works, but I haven't seen him post in a while.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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