Torsion bar porkchop

[jerry work]

Thanks, Jerry...

Another Q. If the ride height is set correctly after a drive, is it necessary to drive after a caster/camber/toe adjustment or can we allow the Les
Schwab tech to bounce/pull down the front to correct ride height for measuring and adjustments?
.....:::::

 

[billvv]

How about if I try a test at Les Schwab.... Ask them to measure the current caster/camber/toe without raising the coach. Then have them raise the
coach and bounce/pull it back to the correct front ride height and measure again. If it's not the same or really close, then it needs to be driven
between adjustments. If it is the same, is there any reason why the subsequent adjustments with bounce/pull would not be valid?
--
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid
November 2015.

 

[Jim Hupy]

Bill, listen to Jerry. He and I have aligned too many GMC coaches to
remember counting. We have already learned these lessons the hard ($$$)
way. The coaches absolutely need to be driven between adjustments to insure
accuracy. But, it is your money. Spend it how you wish.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

On Fri, Sep 21, 2018, 8:19 AM Bill Van Vlack
wrote:

> How about if I try a test at Les Schwab.... Ask them to measure the
> current caster/camber/toe without raising the coach. Then have them raise
> the
> coach and bounce/pull it back to the correct front ride height and measure
> again. If it's not the same or really close, then it needs to be driven
> between adjustments. If it is the same, is there any reason why the
> subsequent adjustments with bounce/pull would not be valid?
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[les burt]

I think Bill’s exercise might serve more to convince the techs at Les Schwab of the need to do as y’all suggest.

To those techs, Bill is just a customer and they are the alignment experts. The exercise should serve to prove to them that they are right (or wrong).

Odds are that what ever they do, the results will most likely prove their side of the argument, whether it be real results or tampered results.

Les Burt
Montreal
'75 Eleganza 26'

>
> Bill, listen to Jerry. He and I have aligned too many GMC coaches to
> remember counting. We have already learned these lessons the hard ($$$)
> way. The coaches absolutely need to be driven between adjustments to insure
> accuracy. But, it is your money. Spend it how you wish.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Fri, Sep 21, 2018, 8:19 AM Bill Van Vlack

>
>> How about if I try a test at Les Schwab.... Ask them to measure the
>> current caster/camber/toe without raising the coach. Then have them raise
>> the
>> coach and bounce/pull it back to the correct front ride height and measure
>> again. If it's not the same or really close, then it needs to be driven
>> between adjustments. If it is the same, is there any reason why the
>> subsequent adjustments with bounce/pull would not be valid?
>> --
>> Bill Van Vlack
>> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
>> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
>> mid
>> November 2015.
>>
>> _______________________________________________
>> 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

 

[billvv]

Thank you Les... I do want to have it done correctly. I'll have to negotiate the measure/lift/measure routine with the caveat that when it fails and
if I can't drive it between alignments after that exercise, I'll go somewhere else. Hopefully I can find a shop that agrees.

Curious what components are subject to hysteresis, compliance, etc. ...Bushings, torsion bars, shocks, any/all of these or others?

I assume the upper control arms are 'normalized' when they're loosened to adjust. And if the coach is pulled down to correct ride height and then
adjusted, why won't the adjustments stay the same after a drive (assuming it returns to correct ride height after a drive).
--
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid
November 2015.

 

[Jim Hupy]

Bill. Think "Neoprene in shear" or "Compothane in shear". T
hey are not really bushings that rotate, but are immobile. Suspension
travel on the bushing end of the control arms occurs within the rubber
component, not around the bolts and nuts. They are clamped tightly between
the ears of the locating tabs.
Jim Hupy

On Sun, Sep 23, 2018, 1:46 PM Bill Van Vlack
wrote:

> Thank you Les... I do want to have it done correctly. I'll have to
> negotiate the measure/lift/measure routine with the caveat that when it
> fails and
> if I can't drive it between alignments after that exercise, I'll go
> somewhere else. Hopefully I can find a shop that agrees.
>
> Curious what components are subject to hysteresis, compliance, etc.
> ...Bushings, torsion bars, shocks, any/all of these or others?
>
> I assume the upper control arms are 'normalized' when they're loosened to
> adjust. And if the coach is pulled down to correct ride height and then
> adjusted, why won't the adjustments stay the same after a drive (assuming
> it returns to correct ride height after a drive).
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>