Timing Belt - Type 44 100Q

[isham-research.freeserve.co.uk at pop.pol.net.uk]

> The belt on the '89 100 Q  seems excessively loose, good thing I checked it.
> the belt twists easily to more than 90 degrees, and can readily slide back
> and fourth on the sprockets.  I can deflect the belt about 3/4" with light
> finger pressure.

That sounds pretty loose.  I think it's probably loose enough for me
to go in there and find out why.  I suspect the water pump wasn't
properly tightened.

> I was going to replace the belt, water pump, etc.  when I install a cam for
> the new owner, but this wouldn't be right away.  So I need to tighten it a
> little.  There are about 40K on the belt, and it shows no significant wear.

> I just want to confirm that I can tighten this by turning the water pump.
> Loosten three bolts and turn by hand counter-clockwise?  Is one of the bolts
> a tensioner?  I hadn't done any I5 timing belts yet, and the Bently isn't
> entirely clear, so any helpful tips are appreciated, especially since I'll
> have four belts to check/replace by next Spring.

There are three bolts.  One is a pivot and the other two are in slots.

Your problem will be that residue from the old sealing ring will stick
to the block and prevent you from getting a good seal with the pump
in it's (slightly shifted) new position.

You need to remove the water pump completely (a bit fiddly, but it does
come out) and clean the face of the block behind it.  Then fit a new
sealing ring (035 133 557), reassemble with the bolts loose, fit the
belt and tighten it up, holding it tight with the bolts.

Probably the most important piece of advice is to make sure you have
very good purchase on the 6mm Allen screws that hold the belt cover
on.  It sounds like you've had that off already, though.

--
 Phil Payne
 UK Audi quattro Owners Club
 http://www.isham-research.freeserve.co.uk/quattro
 Phone +44 7785 302803   Fax: +44 7785 309674