[Vwdiesel] '85 Jetta eating belts - solution
swright at zuiko.sls.bc.ca
Wed Feb 2 10:44:35 EST 2005
I hope this is the solution...
After checking my '85 Jetta NA's alt belt last night, I noticed it was nearly
gone again, this is about 6 months and 10-15k kms. Time to check if my
eyes were correct in telling me that the pulleys were out of whack.
Using an 18" straight edge across the flat of crank pulley and extending
over water pump to alternator, I found this:
-water pump pulley inset approx 1.5 - 2.0mm from crank
-alt pulley was projecting past the crank pulley by 2-4mm
I don't think the alt pulley was the problem, but with the water pump so
close to the crank, having the belt pushed 1.5 - 2 mm sideways was
definitely a problem!
I shimmed the wp pulley by 1.5mm or so, and then ground the top left side
of the alt mount down about 2-3mm, and shimmed the lower alt mount
bolt. The effect of grinding the alernator mount seems to allow a bit of
movement to finetune the alignment when the top bolt is loose, which is a
good thing. I think I will use a straight edge (18" stainless ruler) from now
on when installing this belt. I can now get the straight edge within .5mm
across all 3 pulleys.
So if your engine is eating belts, grab a straight edge and take a look! It is
not normal - my previous Jetta used to go 3-4 years on a single belt.
Shawnigan Lake School
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