[SILVY968]

My clutch has been acting up over the last 3 or 4 weeks. The clutch seems to grab really hard at the end of the travel. It causes chatter, like a glazed flywheel or clutch plate.

I had it by my PM today and he says that the stock dual mass flywheels can get worn internally so that when you put the flywheel under load, the internal mechanism gets to the end of it's flex and grabs hard. He tells me that there is a rebound test to see if the inner guts of the flywheel assembly are in working order.

Anyone heard of this?

Anyone changed to a solid flywheel and still has a good OEM dual mass?

Sounds like I'm in for a new dual mass flywheel that I could buy?

I hear that they are in dwindling supply.

This failure will not leave me stranded, so I guess it's time to start putting away some nickels and dimes.

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[Anchorman]

I have heard - and done - the rebound test. I did it with the flywheel out of the car, and with another (used) flywheel to compare to. The one that had been in my car rebounded much more slowly, and not quite completely, in comparison to the other one. So, the "other" one is what went back into the car. I don't remember what the bad flywheel felt like, other than that I was surprised when my OPC told me it was bad. The comparison, though, showed them to be right.

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[RS Barn]

I'm starting to see a bunch of flywheels go away. The DMF"s purpose is to absorb the firing pulse common with large pistons. Also used exclusivly with modern diesel engines. They fail there as well. The amount of times the pulse squishes the rubber and the amount of heat cycles the rubber endures both have an effect. The rubber cushion shrinks with heat and ozone.

I use more of a compression test to see the condition of the DMF. In a car I can separate the two portions only about 1/2" on a new unit. I've seen up to 1 1/2" + on a worn out FW's. At that time they either knock, vibrate or have grabby feel.

I"m working on a replacement steel flywheel with a spring centered disc. This would act very similar to stock. You could then replace discs when needed and machine flywheel surface. It would also be a bit lighter without the downside of aluminum pieces.

Pete

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[tebogaard]

[quote name='SILVY968' date='Aug 3 2006, 06:35 PM']My clutch has been acting up over the last 3 or 4 weeks. The clutch seems to grab really hard at the end of the travel. It causes chatter, like a glazed flywheel or clutch plate.

I had it by my PM today and he says that the stock dual mass flywheels can get worn internally so that when you put the flywheel under load, the internal mechanism gets to the end of it's flex and grabs hard. He tells me that there is a rebound test to see if the inner guts of the flywheel assembly are in working order.

Anyone heard of this?

Anyone changed to a solid flywheel and still has a good OEM dual mass?

Sounds like I'm in for a new dual mass flywheel that I could buy?

I hear that they are in dwindling supply.

This failure will not leave me stranded, so I guess it's time to start putting away some nickels and dimes.

[right][post="24961"]<{POST_SNAPBACK}>[/post][/right][/quote]

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[tebogaard]

Sorry 'bout the last post, punched the wrong button. If you"re in the Seattle area you might check with Leif Johnson at Autoworks North-West 425 788 3476. His background with the 944 series is extensive. I've had a 968 for 10 years and used him for the last five for general maintenance. Any questions contact me at 206 498 1223

tom bogaard

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[whakiewes]

Thats my next task. Mine does the same thing. Under visual inspection, it doesn't appear that anything is wrong, but it chatters if you ride the clutch any and grabs hard at the end...often causing very jerky starts and jerky shifts. If it helps any, mine temp. went away when a did a couple of 5-6k rpm launches. Its back now though <img src="/forum/images/smilies/968/sad.gif" class="smilie" alt="" /> . I am going to pull my parts and play around...I have a 951 flywheel, another 968, both clutches, and a few more spare 'other' Porsche clutches. I am going to see how it goes, otherwise I am just going to order the Fidanza.



Wes

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[Rude944]

I thought I was the only one with this issue. I replaced my clutch last summer, and it was great for 8 months, only to recently have some chatter. I did not test my flywheel when I did the clutch job, so now I am going to have to do the same job twice. This time, I am going to reuse the clutch, however.

I know the factory replacement flywheel is extremely expensive and I am not exactly interested in buying a used one to allow this to happen again.





RS Barn, save us!!!

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[rhudeboye]

When I got the car the clutch was just replaced. So for a while I thought it was a characteristic of the 968. It's not my daily so when I get it done I want it done right. Whats the ETA on the RS Barns release?

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[SILVY968]

[quote name='RS Barn' date='Aug 4 2006, 07:04 AM']I'm starting to see a bunch of flywheels go away. The DMF"s purpose is to absorb the  firing pulse common with large pistons. Also used exclusivly with modern diesel engines. They fail there as well. The amount of times the pulse squishes the rubber and the amount of heat cycles the rubber endures both have an effect. The rubber cushion shrinks with heat and ozone.

I use more of a compression test to see the condition of the DMF. In a car I can separate the two portions only about 1/2" on a new unit. I've seen up to 1 1/2" + on a worn out FW's. At that time they either knock, vibrate or have grabby feel.

I"m working on a replacement steel flywheel with a spring centered disc. This would act very similar to stock. You could then replace discs when needed and machine flywheel surface. It would also be a bit lighter without the downside of aluminum pieces.

Pete

[right][post="24973"]<{POST_SNAPBACK}>[/post][/right][/quote]



Pete



I can wait for your flywheel. Price and time until available estimates?



Brian

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[Rude944]

No-one has done any research into finding an existing replacement that meets the hall senders needs and is a factory part? Seems with all the model years and various cars out there, this should be available.

I worked at a tuner shop for a while and I can't remember for the life of me what we used when we did the 968 turbo conversions. I know it was not the dual mass. Turbo has two pickups, so that won't work. Perhaps we could have a few of those pickups removed? Just trying to instigate some thoughts.

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