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4kq - water pump noises
Greetings Listers,
I just installed a new water pump, idler pulley and timing belt on my '84
4000s Quattro. After having it all back together, I'm a little disappointed
that I'm still getting noise from the front end of the motor.
**Q1: Are some noises to be expected even with new parts?
With my mechanics stethoscope I think that I have pinpointed origin of the
noises to be the water pump. Unfortunately I don't have the resources to
record an audio stream for you all, so I'll have to do my best to describe
the sounds:
>From the pump, I get a random, intermittent soft "clack ----- clack
clack ---" (one to three or so "clacks") and an intermittent "click click
click" (two to five or so "clicks"). There does not seem to be any
relation between the "clicks" and "clacks" (except the Tappet Brothers on
NPR:-)) I can also pick up the clicks in the idler pulley but not as
strong as the pump.
There is a tiny bit of play in the water pump pulley and a little more in
the idler pulley. Both turn smoothly.
Another thing to note is that the pulley on the new water pump sticks out
about 2mm further than my old one, causing the pump to rub on the inside of
the timing belt cover. I drove the car this way about 150mi before adding a
washer to the lower cover stud.
**Q2: Could the heat generated by the water pump rubbing the timing belt
cover fry the bearings of the pump? Seems those bearings would get pretty
hot under normal conditions anyhow.
**Q3: Should the sleeves that go on the timing belt cover studs be oriented
with the "flange" side toward the motor?
**Q4 The final question: Could I have damaged these parts by
over-tightening the timing belt? I tightened it to the 90deg twist spec in
the Bentley. Does this type of damage occur quickly, or over a period of
time?
Thanks in advance,
Chuck
Seattle, Washington
1984 4000s Quattro