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N54_ABQ N54_ABQ is offline
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Car: 2007 BMW E92 335i
Default Clutch rattle/chatter - Failing DMFW? - 08-09-2019, 08:28 AM

The other day I started my car and as the RPMs dropped it developed a horrible rattling sound coming from the transmission/clutch.

The rattling only occurs at low idle(600rpm) in neutral, clutch pedal out. If I push the pedal in it gets much quieter. With the pedal out if I rev to 1000+RPM rattle goes away completely. Once the car is moving and going through gears there is no noise and no signs of slipping under full power.

I’m pretty sure the Dual Mass Flywheel is on its way out but was hoping to get some confirmation from other drivers that this is what is causing the noise. 96,000mi on factory DMFW. 28,000mi on 335is clutch/pressure plate.
Other posts have mentioned the possibility of the throw-out bearing failing but the intensity of the rattle seems to be something bigger.

As of yesterday the noise has completely stopped and everything sounds normal. I have a feeling it will return soon…

Has anyone experienced this and found it to be a roasted DMFW?


2007 335i E92 6MT FBO, Stock Turbos
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TimboBlackkers TimboBlackkers is offline
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Car: '08 135i MT
Default 08-09-2019, 04:22 PM

I'm about to pull the trans out to check out a similar issue. However my rattling noise is consistent, doesn't come and go.

I'm at 128,000kms and I'm sure it's the original clutch assembly.

It rattles a bit like a smfw but no where near as severe, as you press the clutch pedal it goes quiet.
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N54_ABQ N54_ABQ is offline
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Car: 2007 BMW E92 335i
Default 08-11-2019, 03:59 PM

Two days now and the sound has not returned. I've given it a pretty tough time too. Some 1st - 4th gear pulls and a few fast mid RPM downshifts to get torque going in both directions through the flywheel and it sounds as normal as the day I put in the 335is clutch. I have decided to upgrade the clutch/flywheel anyway. Over the winter I will be installing a set of hybrid turbos and port injection. So doing the clutch upgrade now will ensure the power handling of the driveline I will need as torque levels increase.

A Turner single mass flywheel and an ACT HDSS clutch/pressure plate is on the way from ECS.
All the other goods from FCP;
Clutch fork/throw-out bearing
Pilot bearing
Bass pivot ball
Input, output and shift shaft seals
Rear main seal
Flex Disc (guibo)
Flywheel bolts
Bellhousing bolts
Exhaust gaskets and hardware

Also upgrading the shifter while I'm up there;
UUC EVO 3 short shifter
UUC Billet shift rod
Polyurethane/Teflon shift bushing kit from ECS


Anything else that should be changed during the job?


2007 335i E92 6MT FBO, Stock Turbos
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DeepEddy DeepEddy is offline
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Car: E92
Default 08-12-2019, 06:46 PM

Stifer transmission moint bushings,
Short throw shifter,
New gear oil
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