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Old 10-10-2012, 07:03 PM   #14
Registered User
Join Date: Jul 2012
Location: 757 VA & 732 NJ
Posts: 90
My Ride: 2001 Hellrot 330Ci
Originally Posted by Wh33lhop View Post
The noise you are experiencing is affectionately referred to as "Getrag rattle" in older BMWs. Basically the input shaft/layshaft bearings of your transmission have wear in them and when unloaded and spinning slowly (idle) they will rattle around a bit. The problem is exacerbated by a lightweight flywheel in that it provides less of a "damping" effect that would attenuate the noise.

When you press in the clutch it goes away, because the input shaft and layshaft are no longer connected to the engine and no longer spinning. It is NOT the throwout bearing as the TO bearing is only in action when you are pressing IN the clutch.

It happens on most old(ish) manual transmissioned BMWs. My 330 6 speed does the exact same thing, as well as my E30 and most other BMWs I've driven although some are louder and some are quieter. My suggestion would be to learn to live with it, unless you want to tear your trans apart and replace the bearings. A heavier flywheel would also help quiet it down a bit.
Wow thanks a lot that was some great info! Are these bearings that hard to replace if the trans is dropped? Harder then the throw out I suppose but is it a serious task? This is my first bmw and idk if I can live with it, at drive throws and parking lots people just look at me like what the hell is wrong with your car lol
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