Knocking Noise, Transmission?

thekurgan · 11-18-2015, 08:33 AM

Quote:

Originally Posted by Mattgfx

Good to know, I guess it does sound like a helicopter.

It does have that rhythmic sound. My E36M3 had it, E46M3, E86M, E90M3 and my E39M5 has it to some degree, but much softer.

Others can chime in as well, but it's not the clutch release bearing, as you're (used correctly) releasing the clutch for the sound to appear.

XxMerlinxX · 11-18-2015, 05:53 PM

Can you feel a tapping in the shifter as well?

SukSqueezeBangBlo · 11-19-2015, 09:34 AM

Quote:

Originally Posted by XxMerlinxX

Can you feel a tapping in the shifter as well?

Nope, i cant feel it while holding the shift knob.

tlrid3r · 11-19-2015, 08:34 PM

It's the springs in the dual mass fly wheel. They get old and weak allowing the mass weight to move too much and rattle.

thekurgan · 11-20-2015, 12:35 AM

Quote:

Originally Posted by tlrid3r

It's the springs in the dual mass fly wheel. They get old and weak allowing the mass weight to move too much and rattle.

No. The noise is from the transmission itself. DFM springs aren't under tension when stationary.

tlrid3r · 11-20-2015, 09:18 AM

Quote:

Originally Posted by thekurgan

Quote:

Originally Posted by tlrid3r

It's the springs in the dual mass fly wheel. They get old and weak allowing the mass weight to move too much and rattle.

No. The noise is from the transmission itself. DFM springs aren't under tension when stationary.

I think you are mistaken how a DMF works. It oscillates on idle due to engine power pulse causing noise of spring or weak. I have replaced one and problem solved.

This is loud one but here is a small video
Not Bmw tho.

thekurgan · 11-20-2015, 09:40 AM

I'm aware of how it works, I'm on my 8th.

It's the lash from the input shaft; some have gone to thicker fluids to dampen it, but that doesn't help in the cold weather. Either way, the DMF, on a stationary car, has no load upon it.

fikemurst · 06-03-2023, 09:54 PM

Did this ever get an answer? I have the same thing.

11-18-2015, 05:53 PM	#24
XxMerlinxX Private First Class 31 Rep 187 Posts Drives: '08 E92 M3 Join Date: Aug 2015 Location: Greenville, S.C. iTrader: (0)	Can you feel a tapping in the shifter as well?
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11-19-2015, 08:34 PM	#26
tlrid3r just another M3 514 Rep 1,150 Posts Drives: e92 M3 Join Date: Dec 2007 Location: San Jose, ca iTrader: (6)	It's the springs in the dual mass fly wheel. They get old and weak allowing the mass weight to move too much and rattle. __________________ ///M3... Don't want more power, Just want it to turn sharper one step closer each time. -Ohlins TTX Raceline, PolePostions seats, Akrapovic EVO, ARC-8, 1/2 Cage, Seat Delete, Stoptech BBK, solid Subframe and diff bushing, spherical bearing on everything.
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11-20-2015, 09:40 AM	#29
thekurgan Bad Lieutenant 232 Rep 3,517 Posts Drives: E90M3 Join Date: Aug 2007 Location: Sacramento iTrader: (0) Garage List 2008 BMW M3 [0.00]	I'm aware of how it works, I'm on my 8th. It's the lash from the input shaft; some have gone to thicker fluids to dampen it, but that doesn't help in the cold weather. Either way, the DMF, on a stationary car, has no load upon it. __________________ 02 E39M5 \| TiAg/Schwartz \| Tubi Rumore \| Ultimate Ti Pedals \| E60 SSK \| Jim Blanton 3.45 40/100% \| Coby Alcantara \| StrongStrut STB
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06-03-2023, 09:54 PM	#30
fikemurst New Member 14 Rep 26 Posts Drives: bmw 128i Join Date: Aug 2021 Location: brooklyn iTrader: (0)	Did this ever get an answer? I have the same thing.
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