| Re: [GMCnet] Alignment-Height Setting [message #78766] |
Wed, 31 March 2010 16:21  |
Gary Casey
Messages: 448
Registered: September 2009
Karma:
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Senior Member |
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Ken,
I think leaving the rears in "automatic" will complicate the issue. If you change one torsion bar to tweak the front, the rear valves will attempt to bring it back the way it was (level or not). So I think the way to do it is to jack the front in the center, adjust the bag pressure to get the coach level (side to side) and then lock the rears in the hold position. Now when you adjust the fronts you can tilt the coach side to side, allowing you to get it back level again. Then both fronts will have the same weight - close anyway. Now put it back in automatic and if the coach tilts, one or the other control valves will have to be adjusted.
Gary (going over this in my head for when I do it)
Paul,
I thought about lifting the coach under the center rear for front alignment,
as you suggest. Then someone reminded me that doing that would allow any
rear weight imbalance to bias the front ride heights. By setting the rear
ride height first and then keeping it in Auto during the front alignment,
the rear suspension compensates for any weight imbalance, leaving the front
free to compensate only for front imbalances not cancelled out through the
body stiffness.
Ken H.
Americus, GA
'76 X-Birchaven
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