| Re: Bent bogie arm [message #294792 is a reply to message #245367] |
Sun, 31 January 2016 19:54   |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Camber should not cause fast wear, just where it wears on the contact patch. It still must be toe.
John Lebetski
Woodstock, IL
77 Eleganza II
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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: 9
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Senior Member |
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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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| Re: [GMCnet] Bent bogie arm [message #294797 is a reply to message #294794] |
Sun, 31 January 2016 21:25 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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JR,
We also utilize that type of tool to bend the arm.
It really helps when with the tension or compression, one takes a heavy
ball peen hammer and beat on the member as the molecules will tend to take
that setting.
On Sun, Jan 31, 2016 at 6:36 PM, John Wright wrote:
> Jim B used used to have a device to bend and straighten the bogy arms. It
> was a 10’ piece of 2” shed. 80 pipe welded to a flange that had the bolt
> pattern of the axle. Would get on the pipe with one or more people and
> rebend the arm carefully. You get enough leverage to get the axle pretty
> close. I had a picture and I think that it was on his old web site too.
>
> J.R. Wright
> GMC GreatLaker
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI
> 78 Buskirk 30' Stretch
> 1975 Avion (Under Reconstruction)
> Michigan, On Location in Tucson
>
>> On Jan 31, 2016, at 6:54 PM, John R. Lebetski
> wrote:
>>
>> Camber should not cause fast wear, just where it wears on the contact
> patch. It still must be toe.
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>> Source America First
>>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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