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Old 10-12-2012, 09:51 PM   #2
Registered User
Join Date: Mar 2008
Location: Northern CA
Posts: 172
My Ride: '02 330Ci
That's a good one. You took both belts out and the noise is still there, ehh? You could spray a little WD-40 onto the rubber lip on the front crank seal, I have personally had rear crank seals make noise on the older M30 engines. Other wise.... I take it you have oil pressure. Does the squeal go up with RPM's when you rev the motor or stay constant sound when the motor revs. I have seen crankcase vent systems go full vacuum and make the main seals sing like a whistle. You can just pull the oil cap with the engine running and it should have just a LITTLE bit of suction to it.
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