4kq engine/clutch noises help needed

Huw Powell human747 at attbi.com
Tue Dec 10 17:31:34 EST 2002

> On my 4kq there is a noise i cannot figure out anyone's help would be great.
> When I let out on my clutch in 1st gear from a stop and let the engine rpm
> fall below 800 rpm i get a "pebbles in a tin can" rattle.  At first I thought
> replacing the water pump would get rid of this because at normal idle i could
> hear the sound constantly.  After replacing the water pump the sound went
> away at normal idle and found that the water pump had bad bearings. I did
> overtighten the new water pump tension were the belt could only twist just 45
> degrees instead of 90 degrees. I went about 250 miles on the tension until i
> slacked the belt to the approved 90 degrees.  Did the tension kill the water
> pump bearing?    However the sound now only occurs now when you let out on
> the clutch in 1st gear still.
> What else could be?  Clutch?  Another Water Pump bearing shot?  Engine knock?

sure sounds like knocking, which I guess would be nice to fix, but then
again you shouldn't be letting the rpms drop like that when you are
taking off anyway, right?

Although, on my coupe (and my 90, too?) the water pumps is noisy at idle
and not above, so maybe your water pump is just noisy below idle.

I still think it's your engine knocking when you lug it like that.

Huw Powell



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