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Old 02-27-2009, 05:54 PM   #1 (permalink)
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Question Alignment Issues (Caster)

99 Forester S

So I went to Sears a few weeks ago to get a four wheel alignment. Since the roads were covered in snow, I really couldn't test it out immediately. After a few days, I feel it pull to the left harder than it should. I take it back to sears with the alignment sheet where they guy tells me that the reason it pulls is because I have non-adjustable caster bolts. (I've never heard of such a thing)

Caster is 2.4 FR, 2.6 FL which it says is in range but I have my doubts.

Are these caster bolts something I could replace in my garage? Oh BTW part number is 20540FC140

The guy told me to put 10psi more in the front left so the lower pressure in the right would automatically correct it.......I laughed. He also told me that caster will not affect tire wear and after 3-4k miles in 2 months I cannot tell any difference.

Any tips or advice on replacing caster bolts or should I take it back to Sears and tell them to fix it.

Thanks in advance.

-John
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Old 03-01-2009, 08:52 PM   #2 (permalink)
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Any input anyone?
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Old 03-01-2009, 10:43 PM   #3 (permalink)
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I would take it to another place and get their input. Cars are made so you can run the same psi in both tires. You should have to have a 10 psi difference to drive straight.
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Old 03-02-2009, 12:09 AM   #4 (permalink)
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Castor bolts, what planet is he on, Castor isn't adjustable on a Subaru without adjustable top mounts AFAIK.

Even then .2 degrees castor isn't going to cause that much pull, so I suspect something else isn't right, you may be able to get the castor level by loosening the rear arm mount on the right and knocking it out before retorquing, opposite on the left.

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Old 03-02-2009, 02:00 AM   #5 (permalink)
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He means camber, for sure.

Castor is actually supposed to be different side-to-side. It has a little to do with the amount of weight the vehicle is typically going to carry, and a lot to do with the crown of your average 2-lane US road.

Funny thing, with the wheels dead straight, castor won't effect steering wheel pull at all. Castor really only plays a role in dynamic camber gain, and the tendency to return to straight.

Un-even camber, however, will contribute to steering wheel pull.
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Old 03-03-2009, 01:17 AM   #6 (permalink)
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Well I thought of that, but I don't have that PN for camber bolts (I have 20540AA090) , which are fitted as stock anyway (well on all EU models anyway!), not sure what part that PN is!

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