Alternator Belt Adjustment on Audi 100 1990

[Cody Forbes]

The toothed nut is hardly ever in good condition, I think the teeth and made of play-doh. You may need to loose the bolt that holds the arm to the oil pump as well as re-adjust the reinforcement link that goes over to the A/C compressor. The alternator adjustment arm needs to be able to swivel during adjustment because the alternator swings on an arc.

-Cody Forbes (mobile)

On Jan 30, 2013, at 11:04 PM, "mboucher70 hotmail.com" <mboucher70 at hotmail.com> wrote:

> Fan belt for the alternator is supposedly tightened by an inner toothed nut which engages with teeth in the adjustment arm.  Tightening should be a matter of slackening the central bolt then adjusting the bolt to get the right tension, and finally, tightening back the bolt.
> 
> As best I can tell the teeth on the nut are stripped.  Hard to get a good look but they seem worn, and aren’t tightening anything when turned.  Any ideas where I might get a replacement?
> 
> More immediately, I’m counting on the brute force method of finding a long enough crowbar-like tool to just pry the alternator and then lock the bolts into position.  It will move...up...if I press in the middle of the belt it will move the alternator towards the slacken position, further up the adjustment arm.    But so far I haven’t been able to pry it enough in the opposite direction to get it to move further down the adjustment arm. 
> 
> Thanks for any suggestions,
> 
> MC
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