Rattling when clutching in

vasaline · 04-16-2010, 05:18 PM

I have a z4m and ever since I purchased the car I noticed that when driving slowly in 1st or 2nd when I clutch in I hear this rattling sound. Wanted to see if it is a problem before I bring it in to the dealer.

inTgr8r · 04-16-2010, 05:27 PM

that's normal

vasaline · 04-16-2010, 05:46 PM

Is there a certain way that I have to shift to not have that rattle? I tried to pinpoint where the rattle is coming from and it doesn't seem like it is from the front.

Blind32 · 04-16-2010, 06:00 PM

Hahah, this was on my list of things to search about but I was thinking it was normal. Glad to hear it is. I heard this on an M3 I test drove and asked my BMW tech buddy and he said this was normal for the M3 differential cause of the clutches in the diff. At first I thought my motor mounts were about to break

One less thing to worry about.

Z3Z4MC · 04-16-2010, 07:34 PM

It normal. If you don't want to hear it, keep the rpm up.

vasaline · 04-16-2010, 09:19 PM

Thanks for letting me know guys. Saved me a trip to the dealership.

inTgr8r · 04-16-2010, 09:34 PM

Quote:

Originally Posted by vasaline

Thanks for letting me know guys. Saved me a trip to the dealership.

Basically when clutch is in, the pressure plate is pressed back from the flywheel,
and the pressure plate springs have little to no tension on them.
As a result they will rattle at low rpms.

vasaline · 04-16-2010, 10:54 PM

But why doesn't it rattle when I'm shifting from say 3rd or 4th gear at low rpms? Something to do with gear ratios?

jragan · 04-17-2010, 12:29 PM

This is a "feature" of the dual mass clutch in the ///Ms. It's normal and standard and nothing you can do (short of never releasing the clutch when slow and under any load) will quiet it.

Irish1 · 04-20-2010, 09:47 PM

It's the throw-out bearing rattling/moving a bit when the car's not in gear or the throw-out bearing isn't depressed by the clutch fork. I actually LIKE the sound. It's very typical of older lightweight Bimmers and Porsches, and it reminds me of how cars that have soul SHOULD sound.

04-16-2010, 05:18 PM	#1
vasaline Private First Class 7 Rep 167 Posts Drives: 06 M Roadster Join Date: May 2009 Location: So. Cal iTrader: (0)	Rattling when clutching in I have a z4m and ever since I purchased the car I noticed that when driving slowly in 1st or 2nd when I clutch in I hear this rattling sound. Wanted to see if it is a problem before I bring it in to the dealer.
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04-16-2010, 05:27 PM	#2
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	that's normal
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04-16-2010, 05:46 PM	#3
vasaline Private First Class 7 Rep 167 Posts Drives: 06 M Roadster Join Date: May 2009 Location: So. Cal iTrader: (0)	Is there a certain way that I have to shift to not have that rattle? I tried to pinpoint where the rattle is coming from and it doesn't seem like it is from the front. Last edited by vasaline; 04-16-2010 at 05:51 PM..
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04-16-2010, 06:00 PM	#4
Blind32 Certified Adrenaline Junkie 42 Rep 1,325 Posts Drives: '07 Z4MC Join Date: Sep 2009 Location: Dallas TX iTrader: (2)	Hahah, this was on my list of things to search about but I was thinking it was normal. Glad to hear it is. I heard this on an M3 I test drove and asked my BMW tech buddy and he said this was normal for the M3 differential cause of the clutches in the diff. At first I thought my motor mounts were about to break One less thing to worry about.
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04-16-2010, 07:34 PM	#5
Z3Z4MC Private 0 Rep 80 Posts Drives: Z4MC Join Date: Jul 2009 Location: usa iTrader: (0)	It normal. If you don't want to hear it, keep the rpm up. __________________
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04-16-2010, 09:19 PM	#6
vasaline Private First Class 7 Rep 167 Posts Drives: 06 M Roadster Join Date: May 2009 Location: So. Cal iTrader: (0)	Thanks for letting me know guys. Saved me a trip to the dealership.
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04-16-2010, 10:54 PM	#8
vasaline Private First Class 7 Rep 167 Posts Drives: 06 M Roadster Join Date: May 2009 Location: So. Cal iTrader: (0)	But why doesn't it rattle when I'm shifting from say 3rd or 4th gear at low rpms? Something to do with gear ratios?
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04-17-2010, 12:29 PM	#9
jragan Imola Lover 26 Rep 749 Posts Drives: 2007 Imola Red M Coupe Join Date: Jul 2008 Location: Fort Worth, Texas iTrader: (0)	This is a "feature" of the dual mass clutch in the ///Ms. It's normal and standard and nothing you can do (short of never releasing the clutch when slow and under any load) will quiet it. __________________ His: RIP-"Ruby" *E86 ///M Coupe: Pics Track Pics Short Vids Long Vids Hers: 997-1 C4S*: Pics
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04-20-2010, 09:47 PM	#10
Irish1 New Member 1 Rep 20 Posts Drives: 2008 Z4 3.0Si Coupe Join Date: Aug 2008 Location: Monterey,CA iTrader: (0)	It's the throw-out bearing rattling/moving a bit when the car's not in gear or the throw-out bearing isn't depressed by the clutch fork. I actually LIKE the sound. It's very typical of older lightweight Bimmers and Porsches, and it reminds me of how cars that have soul SHOULD sound.
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