broken alternator belt

Peter Schulz pcschulz at
Tue Feb 24 09:36:56 EST 2004

Scott/ Mark:

Some tips when adjusting the Alternator and AC compressor.

Loosen all the pivot bolts ( 13mm and 15mm on the Alternator, 17 MM on the 
AC compressor.
Follow the Bentley tips on loosening the support bracketry that goes 
between the alternator and the AC compressor (Bentley describes the order - 
A, B, C)

The Star Bolt is actually a 22MM,  loosen the captive 13mm about a turn, 
use the 22mm start bolt ( the "pinion" to adjust the the alternator or 
compressor against the "rack" the toothed plate, and retighten the 13mm 
bolt while holding 22mm star bolt in position.

THEN tighten the pivot bolts and the other remaining ones.

Again, you will need 13, 15, 17 wrenches/sockets and a 22mm open end or box 



At 02:17 AM 2/24/2004, SuffolkD at wrote:

>Mark: You can do this your self.
>You can drive for a while without the belt.
>Make sure the replacement is a Conti belt profiled for the Audi Alt pulley.
>If you use electrical items with no alt belt your battery will discharge in a
>few minutes of driving................I've made 40 miles after one broke, but
>that was with no lights, radio, heat etc....................
>Replacing it yourself: Crawl under and check out the assembly.
>There is a bolt on the back of the alt that seems like its an adjustment for
>tensioning the belt.  It runs through the center of a (star wheel that moves)
>in the teethed channel of a bracket.
>The BENTLEY is very vague here.
>that 13?mm bolt is supposed to have a tension of like 22 ft lbs. (someone
>with the correct spec please chime in) all it does is snug the star wheel 
>to the
>alt casting.
>A larger mm box wrench is used on the outside edges of the star wheel (look
>close the edges are flattened to accept a open ended box wrench) to make the
>tension (to the belt) adjustment.  The smaller bolt through the center of the
>wheel just holds the star wheel in place.......... to keep it from slipping
>loose and putting slack back into the belt.
>To "pry" or move the alt back and forth I found a large 3/4" extension 18"
>long or so, worked for leverage.  This was placed carefully against the block.
>The Bentley mentions loosening the top pivot bolt on top of the alt which
>seems to go the engine block.  I found that bolt inaccessible.
>This is not the preferred Bentley method.  It worked for me.  It may not for
>This just swings the alt a bit so you can get a new belt on.
>Remember touching the battery cables on the back of the alt will give you a
>nice shock and sparks show.....................................
>I can post photos  I just did this.
>HTH - Scott by BOSTON
> > Dear list members:
> > Driving home from work last night, the alternator belt snapped.  The car
> > still ran and I made it home no problem.  A few basic questions:  Is there
> > any problem driving it a couple of miles down the road to my mechanic?  How
> > difficult a job is it to replace the belt?  Should I replace all v-belts at
> > the same time?
> > Many thanks,
> > Mark
> >
>200q20v mailing list
>200q20v at

Peter Schulz
1990 CQ (perpetually awaiting S2 3b engine transplant)
1991 200 20v TQW indigo mica
1991 200 20v TQW titanium grey
Chelmsford, MA USA
peter at  

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