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Old 09-07-2011, 02:16 PM
pburnett pburnett is offline
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Location: Severna Park, MD
Join Date: Jan 2011
Posts: 30
Mein Auto: 2006 BMW X3, Lexus IS300
Originally Posted by timfitz63 View Post
OK. Engineer here. Not quite following your description of the gear reversal and how that 'fixes' the problem, so maybe I'm missing something critical, but:

I don't think reversing (or simply rotating, if that's what you're suggesting) the exposed white gear 180 degrees will correct the problem. Yes, that could re-position a 'good' portion of the black gear onto the worm gear, but regardless of how the gears are positioned, as all of them turn, the black gear will rotate until its worn portion reaches the worm gear, then it stops turning again. This will happen within one rotation of the black gear.

Based on the wear that you highlighted on the black gear, I think it would have to be replaced -- if one can find the part...
It looked to me that the black gear doesn't turn the whole way around, only really over that worn area. I believe BMW used a full gear as to ease the installation (not having to worry about the position you put it in)

If it continuously rotated around, woundn't the gear wear more evenly and not in a single spot about the length of the worm gear?

Again, I guess it might not be a fix per say, but it could seriously delay the need to spend 900 bucks.

Just a thought.

Last edited by pburnett; 09-07-2011 at 02:17 PM.
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