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Clutch Clunk. Me or it?


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#1 doublesnaggle

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Posted June 09, 2012 - 11:47 PM

I just bought a 99 996 C2. 140k on it. New clutch at 70k. Im not familiar with the new noises... When I shift in any gear, I let out the clutch and mix some gas pedal and I hear and feel a low thunk or clunk coming from the rear. Like I am picking up slack in a bad u-joint. (in a car with a driveline) Am I shifting or using the clutch improperly? If I let out very smooth and slowly, it wont clunk. Ive driven many many standard transmissions. I think Ive heard this before, not sure though... Any advice?


Edited by doublesnaggle, June 09, 2012 - 11:48 PM.

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2000 996 C4 "Seinfeld" owned. 85000 Miles
1999 996 C2 145000 Miles
2006 Cayenne S 45000 Miles
2007 Caterham CSR260

#2 logray

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Posted June 10, 2012 - 07:01 AM

Sounds like it could be the DMF spring action. Did they replace the flywheel when the clutch job was done?


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#3 doublesnaggle

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Posted June 10, 2012 - 01:41 PM

Don't know cause the last owner doesn't know. I wonder if I called the shop if they could tell me from a record of repair from years ago...


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2000 996 C4 "Seinfeld" owned. 85000 Miles
1999 996 C2 145000 Miles
2006 Cayenne S 45000 Miles
2007 Caterham CSR260

#4 logray

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Posted June 10, 2012 - 06:00 PM

If the dual mass flywheel is toast, you can get all sorts of strange noises and clunks, thuds, etc. Unfortunately typically if it is anything more than the flywheel causing these problems you are looking at big $$$$ for motor or transmission repair. It might be possible your slave cylinder is slow or needs to be bled. But my guess would be flywheel. There is a flywheel inspection procedure when the clutch is replaced, and in addition, it is usually customary to replace the flywheel when the clutch is done at such high mileage and under "spirited" driving conditions. These are just guesses though, and in the hands of an experienced mechanic who is actually looking at or experiencing the problem might provide an alternate diagnosis.


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#5 fpb111

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Posted June 10, 2012 - 06:20 PM

Also check the rubber in your transmission mount. When they start to deteriorate they will clunk.
Does it also clunk when you step on the gas, let off, and step on the gas again? check the trans mount.

http://www.autoparts...ngs Best Seller


Do you often hear a rattle/clunk when you shut the car off? Check the DMF

TSB 911 (996) 8/02 1360 Dual Mass Flywheel Check procedure

http://www.renntech.....-procedurepdf/

Can the dual Mass Flywheel be twisted approx. 15mm in each direction, left/right, and does it return to approximately its initial position? If so it is good.

Can the DMF be twisted beyond dim stated above without a noticeable increase in the spring force? Or is it fixed (no rotation?) if so bad


Edited by fpb111, June 10, 2012 - 06:26 PM.

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#6 porsche34

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Posted June 12, 2012 - 10:10 AM

Probably the CV joint...cheap and easy DIY. Good luck Robert


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#7 doublesnaggle

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Posted June 12, 2012 - 11:29 PM

It only does it when letting my foot off the clutch. In any gear. It comes from the rear of the car. It sounds low and deep, like a thud more than like a clunk. It feels like slop in the drivetrain. I don't know what a CV joint sounds like when its sloppy, but I have a feeling thats it. Ill find out how to check it. I just drove the car from SF to Seattle. The MAF went out the day after I got in Seattle. It knew to make sure to get me home first. :notworthy:


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2000 996 C4 "Seinfeld" owned. 85000 Miles
1999 996 C2 145000 Miles
2006 Cayenne S 45000 Miles
2007 Caterham CSR260




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