Changing Belts

Alan Streicher streichea001 at
Fri Aug 15 14:13:14 PDT 2014

The proper way is to loosen the four nuts inside the outer most pulley. 
Remove the belt. Watch for any shims up against the back of that 
pulley.Now you will see the A/C pulley fall apart revealing the two 
halves, plus a number of shims. Pay attention to how many shims are 
between the two halves. Remove the two halves and shims. If you were 
going to replace the inner most belt, you will be able to.

Now, here is how you put the divided pulley back together. Place the 
extra shim(s), the on the heavy full pulley, followed by the outer half 
of pulley, shims that were between the two shim halves, and the back 
side of the half
of the pulley. Now slide that assembly into the vibration damper. Attach 
the four nuts loosely.  Place A/C belt over pulley.

Place a socket over the large nut that connects to the crankshaft. 
Slowly turn the crankshaft clockwise while tightening the four nuts in a 
cross pattern. You will see the A/C split pulley coming together and 
squeezing the V-belt.
Repeat until  you can't tighten anymore and the belt is sufficiently 
tight.  If not tight or too tight, then add or remove spacers

I hope this helps.

1990 80 non-Q

> On 8/14/2014 8:57 PM, mboucher70 wrote:
>> Almost embarrassed to ask such a basic question...but here goes...
>> What’s the trick to getting a belt onto and off of the 
>> air-conditioner compressor?  Car is 1990 Audi 100, NF, Non-Turbo, 
>> Non-Quattro
>> I recently set out to change all three belts, and for the ac belt, 
>> the correct one was listed as 13x915.
>> With both the hydraulic pump, and the alternator, I was able to 
>> loosen them enough that the belts easily slipped on and off.
>> With the A/C, it was a different story.  The compressor adjusting 
>> bolts were loosened and the compressor moved as close to the 
>> crankshaft pulley as possible.  It simply couldn’t move any closer as 
>> it was up against the oil pan.
>> If I wrestle with it hard and long enough, I can get it on and off, 
>> but can’t help thinking that there must be an easier way.
>> As an alternative, could I look at a slightly longer belt? 13x920 or 
>> 13x925?
>> Thanks for any suggestions,
>> MC
>> 1990 Audi 100, NF, Non-Turbo, Non-Quattro
> Worldpac lists the 9x125 as an option.  I'd use it.
> John
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