Hayk928

Hi guys,

Just a quick question: I do know the advice to not start while pushing the clutch due to the thrust bearing which that time hasn't got enough oil on it.

Being on the way to chose a new clutch for my SE, I'm in doubt wich clutch kit I should take. If the spring of a GTS clutch is stronger, does that probably harm the TB more than standard? What are the pro's and con's of both clutches? Are the SPEC kits an option? Most important for me is, that it treats the engine as careful as possible - pedal force don't matter at all.

Thanks for your help.

Marc

Rob Edwards

Huh, I have never heard this- where'd you hear that advice? Hope I haven't unknowingly been killing my thrust bearing...

RE: clutch kits, I think it's a moot point, as I think only the GTS pressure plate 928 116 004 16 is still available, while the GT PP (928 116 004 12) is NLA. But Roger would know for sure what's available.

dprantl

It's the opposite. Starting the car without pushing the clutch pedal will wear the thrust bearing more because the pressure plate is pressing the discs against the flywheel and putting load on the crank. When you push the clutch pedal, you are using hydraulic pressure to push the pressure plate away from the discs and the flywheel. So instead of pushing on the flywheel, the force is now on the clutch slave cylinder and the bell housing it is attached to.

However, I wouldn't worry about whether a GTS clutch puts more pressure on the thrust bearing than a GT clutch, the wear is probably not very much. And anyway, if you start the car with the clutch pushed in every time, it won't matter at all.

Dan
'91 928GT S/C 475hp/460lb.ft

Hayk928

I red it here on RL, in another clutch thread...

I still have a GT PP, so I could decide whether to use it or get an entire GTS kit.

Hayk928

Dan,

Doesn't the hydraulic pressure from the cylinder that pulls the plate apart need a counter bearing from the crank? I thought, the force on the TB of a manual car comes from the opposite direction (front, instead of back in an auto)?

dprantl

Hmm, now that I think about it more, you may be right. Since the PP is bolted to the flywheel, when you are not pushing the clutch pedal, the force is only on the flywheel and there is no push on the crank at all. When you push the clutch in, you are forcing the clutch springs backwards, and since the PP is bolted to the flywheel, it is trying to pull the crank back with it.

Dan
'91 928GT S/C 475hp/460lb.ft