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austin9888 10-09-2012 01:14 PM

engine techs please help
Hi i purchased a m54 3.0 rebuilt motor for my 330ci and waiting to hear back from the builder, but for the mean time... indy mechanic installed the motor and put everything together car fires right up and idles fine. But their is a very loud squeal like a belt or bad bearing coming from the front of the motor. we removed both belts and the sound is still there. He drained the oil pan to find no metal shavings and he took off the valve cover , and no marks on the timing chain or cams.

clutch pedal pushed in or out it still makes the noise i think that takes the throw out bearing out of play

ANY input would greatly be appreciated

Thanks Austin

F1004fun 10-12-2012 09:51 PM

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.

austin9888 10-23-2012 02:49 PM

update! it turns out not to be the motor :) the mechanic that installed the motor, im thinking did not install the pilot bearing or the TOB correctly because if i start it in gear, hold the clutch in, the noise is gone. But it wont come out of gear and if the car is on, in neutral it cant shift into gear. so something in the transmission is making the noise. i took the car back and im pulling the trans out on thursday

austin9888 10-23-2012 02:51 PM

F1004fun thank you for replying!

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