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Re: [GMCnet] Bent bogie arm [message #294793 is a reply to message #294770]

Sun, 31 January 2016 19:51

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma:

Senior Member

Jake,

I agree with JimK that your fundamental problem at the middle right is most
likely camber. I'm sure you're already aware that by far the most common
rear wheel alignment problem on GMCs is that the right middle suspension
arm is bent inward due to striking curbs during right turns. Given the
generally narrower streets in Europe, I'd expect that problem to be even
worse there than here.

When the arm is bent inward, it creates a positive toe-in situation. If
you think about it, when the coach rolls forward, even straight ahead, the
force vector created with positive toe will have a lateral component -- in
the case of the right middle wheel, that force will be inward, pushing the
tire patch to the left and causing a rotation about the suspension arm --
in other words, creating positive camber. The other suspension arms, from
fatigue, wear in their bogie bushings, etc., will tend to "sag", creating
the negative camber you report. In any case, camber is not generally a
large contributor to adverse tire ware (look at all the swing-arm VW's!).

To verify or refute my proposition, jack up the right side of the coach
until the middle wheel clears the ground, then lower it back down. If
there's a lateral force component, it should be relieved and that wheel
should show less positive (probably zero or negative) camber.

As you may have heard, one of our GMC specialists, Sirum, corrects
suspension arm alignment by bolting on a wheel to which has been welded an
8' long large diameter pipe. That lever enables them to bend the arm
"wherever they want it". That may be your best option if camber correction
really is needed. Toe correction doesn't require that extreme a solution.

HTH,

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com

On Sun, Jan 31, 2016 at 1:20 PM, Jarkko Lampinen <
jarkko.lampinen@pp2.inet.fi> wrote:

> We are still having some tire wear in right middle tire.
> It seems that there`s some positive camber in that bogie arm while other
> three are having slight negative camber.
> Is there any other way to adjust camber in rear arms than with jig shown
> on these pics?
>
> Jake
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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[Message index]

		Bent bogie arm By: 77PBFinland on Thu, 27 March 2014 16:33
		Re: Bent bogie arm By: appie on Thu, 27 March 2014 16:41
		Re: Bent bogie arm By: GMC Cruse on Thu, 27 March 2014 17:04
		Re: Bent bogie arm By: C Boyd on Thu, 27 March 2014 17:14
		Re: Bent bogie arm By: Loffen on Thu, 27 March 2014 18:14
		Re: Bent bogie arm By: Ken Burton on Thu, 27 March 2014 18:38
		Re: [GMCnet] Bent bogie arm By: k2gkk on Fri, 28 March 2014 09:59
		Re: [GMCnet] Bent bogie arm By: Little Yimmy on Fri, 28 March 2014 10:08
		Re: [GMCnet] Bent bogie arm By: james Ernst on Fri, 28 March 2014 10:48
		Re: [GMCnet] Bent bogie arm By: Billy Massey on Thu, 27 March 2014 19:49
		Re: [GMCnet] Bent bogie arm By: USAussie on Thu, 27 March 2014 19:59
		Re: Bent bogie arm By: Bob de Kruyff on Thu, 27 March 2014 19:56
		Re: [GMCnet] Bent bogie arm By: Kingsley Coach on Thu, 27 March 2014 20:21
		Re: [GMCnet] Bent bogie arm By: corleyw on Thu, 27 March 2014 21:24
		Re: [GMCnet] Bent bogie arm By: USAussie on Thu, 27 March 2014 22:35
		Re: [GMCnet] Bent bogie arm By: Bob de Kruyff on Thu, 27 March 2014 22:56
		Re: [GMCnet] Bent bogie arm By: corleyw on Fri, 28 March 2014 11:37
		Re: [GMCnet] Bent bogie arm By: USAussie on Fri, 28 March 2014 17:45
		Re: Bent bogie arm By: kerry pinkerton on Fri, 28 March 2014 07:27
		Re: [GMCnet] Bent bogie arm By: Ken Henderson on Thu, 27 March 2014 22:49
		Re: [GMCnet] Bent bogie arm By: gbarrow2 on Fri, 28 March 2014 11:35
		Re: [GMCnet] Bent bogie arm By: roy1 on Fri, 28 March 2014 11:45
		Re: [GMCnet] Bent bogie arm By: dwayne jacobson[1] on Fri, 28 March 2014 12:04
		Re: [GMCnet] Bent bogie arm By: gbarrow2 on Fri, 28 March 2014 12:08
		Re: [GMCnet] Bent bogie arm By: Mr ERFisher on Fri, 28 March 2014 12:05
		Re: [GMCnet] Bent bogie arm By: Ken Henderson on Fri, 28 March 2014 12:13
		Re: [GMCnet] Bent bogie arm By: A Hamilto on Fri, 28 March 2014 12:27
		Re: [GMCnet] Bent bogie arm By: roy1 on Fri, 28 March 2014 14:48
		Re: [GMCnet] Bent bogie arm By: gbarrow2 on Fri, 28 March 2014 14:29
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sat, 29 March 2014 00:47
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sat, 29 March 2014 01:13
		Re: [GMCnet] Bent bogie arm By: gbarrow2 on Sat, 29 March 2014 08:11
		Re: [GMCnet] Bent bogie arm By: John Olson on Sat, 29 March 2014 10:55
		Re: [GMCnet] Bent bogie arm By: A Hamilto on Sat, 29 March 2014 11:29
		Re: [GMCnet] Bent bogie arm By: 77PBFinland on Sun, 31 January 2016 12:20
		Re: [GMCnet] Bent bogie arm By: roy1 on Sun, 31 January 2016 12:32
		Re: [GMCnet] Bent bogie arm By: jimk on Sun, 31 January 2016 18:32
		Re: [GMCnet] Bent bogie arm By: Ken Henderson on Sun, 31 January 2016 19:51
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sat, 29 March 2014 11:41
		Re: [GMCnet] Bent bogie arm By: James Hupy on Sat, 29 March 2014 11:52
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sat, 29 March 2014 17:04
		Re: [GMCnet] Bent bogie arm By: James Hupy on Sat, 29 March 2014 18:00
		Re: [GMCnet] Bent bogie arm By: Ken Henderson on Sat, 29 March 2014 18:49
		Re: Bent bogie arm By: 77PBFinland on Fri, 28 March 2014 15:33
		Re: [GMCnet] Bent bogie arm By: USAussie on Fri, 28 March 2014 17:50
		Re: [GMCnet] Bent bogie arm By: corleyw on Fri, 28 March 2014 22:18
		Re: [GMCnet] Bent bogie arm By: Guy Lopes on Sat, 29 March 2014 13:26
		Re: Bent bogie arm By: Loffen on Fri, 28 March 2014 18:23
		Re: Bent bogie arm By: 77PBFinland on Sat, 29 March 2014 12:17
		Re: [GMCnet] Bent bogie arm By: USAussie on Sat, 29 March 2014 19:08
		Re: Bent bogie arm By: Ken Burton on Sat, 29 March 2014 19:42
		Re: [GMCnet] Bent bogie arm By: USAussie on Sat, 29 March 2014 21:31
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sat, 29 March 2014 22:52
		Re: [GMCnet] Bent bogie arm By: USAussie on Sat, 29 March 2014 23:30
		Re: [GMCnet] Bent bogie arm By: mickeysss on Sat, 29 March 2014 23:57
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sun, 30 March 2014 00:51
		Re: Bent bogie arm By: 77PBFinland on Sun, 30 March 2014 04:09
		Re: [GMCnet] Bent bogie arm By: Olly Schmidt on Sun, 30 March 2014 04:18
		Re: [GMCnet] Bent bogie arm By: Jerry Wheeler on Sun, 30 March 2014 07:31
		Re: [GMCnet] Bent bogie arm By: Ken Burton on Sun, 30 March 2014 08:43
		Re: Bent bogie arm By: JohnL455 on Sun, 31 January 2016 19:44
		Re: Bent bogie arm By: JohnL455 on Sun, 31 January 2016 19:54
		Re: [GMCnet] Bent bogie arm By: powwerjon on Sun, 31 January 2016 20:36
		Re: [GMCnet] Bent bogie arm By: jimk on Sun, 31 January 2016 21:25

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