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      01-18-2013, 09:07 AM   #11
cposk
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Drives: 08 IB M3 (E90)
Join Date: May 2012
Location: Annapolis - Maryland

Posts: 153
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Quote:
Originally Posted by philom5 View Post
Wanted to revive this thread and see how everyone's car is doing with the trans rattle. I just picked up an 08 with 12k miles and was very surprised to hear the trans rattle that everyone is reporting as "normal." What concerns me is this sound is identical to the trans rattle I get in my 88M5 that has a sport trans (G280). This sound among early model M5 guys is infamous and well documented. The rolling noise is from the input shaft bearing failing.., and the clacking noise is from the lay-shaft for 5th gear. I've heard the e90 6 speed trans has a similar layout.

So, what concerns me is that over time, say after 80-100k miles, this noise starts to get really bad. Bad enough to be heard by the car next to you while in stop and go traffic. If I can hear this noise at 12k.., what's it gonna sound like at 50k ?

I wonder if I sat in a new e90 would i still hear the trans noise ?
I get two noises, both considered "normal"

The first is flywheel chatter. This is more common in 08's because of the lighter flywheel. You will notice it when in neutral with the clutch out. It sounds like rocks grinding around in the tranny, gets worse as the fluid warms up. This noise is completely normal.


The second is the rattling noise when engaging and disengaging the clutch in 1st gear at lower speeds. I notice it most when going up the curb into my driveway. It really doesn't sound good but it is noted in the owners manual so I guess we have to live with it...
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