95 E300D has picked up a noise, and I've been searching noise threads to no avail.

Its a whirring noise, intermittant, coming from either the engine or trans, that follows engine rpm.

Its more noticeable in the car than with the hood up hanging over the engine.

I've checked the usual suspects with a mechanic's stethoscope.. serpentine belt tensioner, shock, bearing, etc. but no go. And as I said, its intermittant.

I haven't tried it up on a lift yet, and that will be the next step.

Any "been there, done thats" would be appreciated.

Many thanks,
Mark

Have you checked all the engine accessories? How many miles on the car? I had a whine only noticeable in the car above 2000rpm that turned out to be a failing vacuum pump. Now I've got a whiny rear end instead... I'm on my second noisy diff now, quite common on these cars.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

Drop the tension on the serpentine belt and fire it up for a couple of minutes. No WP so don't run it too long.

No noise = bad accessory device.
Noise = Look elsewhere.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I was getting a smililar noise at the tensioner pulley, it would come and go and follow engine RPM, but it almost sounded as if it was coming from somewhere else. The pulley was hardly moving when I pulled the tensioner off and replaced everything, I ended up replacing the belt and tensioner shock while I was in there, no more noise.