Me, again ...
I got rid of part of the noise from my 603.970 engine ... replaced A/C compressor and clutch (bearings bad in clutch) ... still have an odd sound that is at about 1/4 the rotation of the engine ...
If the vacuum pump is going bad does it make any noise ... I have a leak that appears to start with drips at the bottom of the (pressed on) access plate on the front of the pump?
My noise is sort of a light, near front of engine, "thud ..tick.. tick" and repeating ... squealing went away with A/C clutch replacement ... does not appear to be coming from other accessories on the belt, like the generator (coming from center or driver side ... listened carefully) or waterpump (relatively new) ... I also replaced the tensioner shock and the tensioner itself about 6 months ago ... all was utterly silent for a month or two, then started getting noises ... approaching 150K so some failures are normal, I guess.
Help!
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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
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