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    Clutch Vibration Problem

    My 07 C4S has a clutch vibration problem that the dealer is having difficulty solving. Slight shudder when you first release the clutch at low RPM. As car warms up becomes extremely difficult to drive without stalling. Car was delivered with this problem but I was told to put a few km. on car to see if it goes away. Dealer replaced clutch and pressure plate at 800km and problem creased for a short time before coming back at 1500km. Dealer has had car apart in shop for two days and can not find problem. Shop foreman tells me that everything measures correctly and clutch/pressure plate not showing any unususal wear. Has anyone experienced this problem and if so, did you/your dealer identify the problem? Btw, I'm told by the dealer that they have another car in inventory doing exactly the same thing. Porsche has no answers.

    Re: Clutch Vibration Problem

    Tell them to get a NEW pressure plate and a NEW clutch plate and a NEW release bearing, a new whatever... .

    If it were my problem at this point you describe, instead of being cheap, I would start throwing money at it with all new parts until I got results.

    "Shop foreman tells me that everything measures correctly and clutch/pressure plate not showing any unusual wear."

    These are candidates for a catalog of "Famous Last Words."

    Just my two cents.

    Either the shop guy is missing something or the car is haunted.

    Re: Clutch Vibration Problem

    Quick update: Dealer now tells me that the problem is due to the type of material that the clutch plate is made from. He went on to say that 2 months prior to my car being produced, Porsche changed the material that they used to manufacture the 997 clutch plates. This material is supposedly "more grappy" (his words not mine) then previous material used. Went on to say that more aggressive drivers would not experience this problem because they rev the engine higher when starting off. Anyway, new clutch kit on it's way from Alanta so I should get the car back late afternoon. What do you think, should I get the shovel out??

    Re: Clutch Vibration Problem

    Clutch vibration is similar to disk brake vibration. A warped disk brake rotor will start 'shuddering' after a few hundred miles no matter how many times you replace the brake pads. You have got to replace the rotor (or figure out why the rotor is running out-of-true with respect to the pads).

    In your case, one or more of the flywheel, clutch disk, and pressure plate has not been manufactured or installed correctly. Since the clutch disk and pressure plate have been replaced, that leaves the flywheel (or figure out why the flywheel is running out-of-true with respect to the clutch disk).

    Re: Clutch Vibration Problem

    That is BS I think. test drive another car and see if you will have the same complaint.

    Re: Clutch Vibration Problem

    Update : Picked up the car with the new clutch kit installed Friday. Feels great so far, clutch release feels totally different. Much smoother action than previous two clutches and the release action begins when the pedal is much closer to the floor. Shop Tech tells me that he had to dig for this solution. It appears that this is an issue Porsche has not informed dealers about but they have developed this alternative "clutch kit" to address the problem. Anyway, I mentioned to the Tech that I had heard from a couple of other people regarding this problem and he told me to give them this part number (997-116-913-13)for the clutch kit. The release bearing number is 997-116-080-01. On a side note, he said that this is the strangest part number he has ever seen. Apparently it is not listed in the offical Porsche parts inventory lists and he got it from a Porsche Tech engineer in New York. I hope this works but I'm cautiously optimistic because the last time they changed the clutch disc and pressure plate everything was good for the first couple of hundred Kms. Hope this helps anyone suffering from the same issue.

     
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