HELP! Clutch problem

[axl911]

Hi all,

This problem is frustrating me. Any reason why my 92 C2 (G50) clutch would be light sometimes and heavy other? When it's heavy, it feels gritty and does not want to return when fully depressed.

It feels light if the car sits for several days, but will feel heavy again after a short drive.

I've replace the master and slave cylinder and the flexible hydralic line. Bled the clutch carefully with a power bleeder. There is no binding on the pedal cluster, and there is no play on the roll pin?

The clutch was replaced by the previous owner last year along /w the pressure plate and throwout bearing.

Any idea why this is hapenning besides spending $1K to check the clutch.

If the fork or guide tube is seizing up, then it should be heavy all the time right?

Pls help.

thanks,
anthony

[Britwrench]

This is when you fnd out the previous owner didn't replace all the clutch parts like he told you.

Take it out and carefully check the release linkage. The shaft, bearings and lever must be in perfect condition. After cleaning them lube all the parts with the correct PORSCHE grease.

There must NOT be any grease on the guide tube/release bearing. See the tech bulletin that applies.
I would suspect that the guide tube and release bearing were greased and are seizing up due to dirt accumulation.

[axl911]

Hmmm.

My research shows that half the people suggested greasing the guide tube & release bearing, the other half said not to.

The car is a 92 C2. What's the clear answer?

thanks,
anthony

[Britwrench]

My research is based on reading the relevant technical bulletin for your Porsche. The later release bearing and guide tube should not be greased. The bearing has a plastic-type insert that is self lubricating. These parts were introduced in the late 80s for the Carrera 3.2 with the G50. Susequent to that nothing has changed. You have to lubricate the end of the clutch release fork where it engages on the bearing and the other end of the fork where the slave cylinder rod is. If there is the Sachs bearing in there then NO lube is required on the guide tube.