I have a 1976 vette with about 120K miles on it. Owned it since new.
Last year I had to do a fair amount of work on it (spring, shocks, rad
support bracket, new rad, new water pump.).
It seems to have been developing a problem and I am not sure what it
I thought it started about the time I installed the new water pump,
but that could be nothing more than sheer coincidence. It was making a
sort of slight rubbing/banging/knocking noise, and I thought it was
some minor machining discrepency causing a slight rubbing of the water
and main pulleys. There was a rubbing sound that went away after a
Yesterday I had to replace a motor mount and tightened a bit of
exhaust on the manifold.
Today the noise is back. But now It sounds more like a banging/
sound. The frequency increases with engine RPM. If I bring the engine
up to a modest rpm and hold it there , it seems to go away. It seems
worse when I first start it.
Now I am obviously not expecting a thorough diagnostic from this
description, but I am not a very experienced mechanic. Does it sounds
like the symptoms of a main/crank bearing or something terminal of
that nature? If so, I'm afraid old Betsy is doomed because I do not
have the facilities nor the resources to get it repaired ......
FWIW, it still seems to run ok, oil pressure is normal, battery
charging, water temp, shifting etc.... I went around it with a crowbar
and using it on my ear as a poor man's stethoscope and was unable to
pinpoint the source of the problem (so far)... It definitely seems to
be coming from the bottom part of the front/engine somewhere.....
Thanks for any input.