Unsolvable Clutch Problem?

[Ferdzz]

This is a continuation from my ongoing problem with my clutch.
Here is some history:

Drive about 100-120 miles and clutch starts to become at a lower engagement point, finally after 150 miles clutch pedal is nearly to to floor and can not engage into a gear.
Bleed the clutch with very little air in line and it goes back to normal, until I drive as above.


No fluid leaks
Changed the following parts already:
Clutch Slave x2
Clutch Master
Clutch (rubber) soft line going into slave

I do have a issue with the clutch release bearing, since I can feel a vibration in the clutch when slightly depressed.
The clutch has only 9K on it, which was switched to a stage 2 clutch and lightweight flywheel.

During my bleed operation with the motive power bleeder charged up and clutch pedal all the way down with a piece of wood hold it down.

When I turn the bleed screw, a little bit of air (air bubbles large 4-5 ) can be seen in the clear hose going into my catch basin.

At the same time when I turn the bleeder screw, I can hear the clutch release and it seems that the slave has pushed back to its full retracted position.

What seems to happen is that when I drive the 100-150 miles the clutch slave piston is increasingly becoming extended out, and not returning to it's full retracted position (clutch pedal all the way up). But when I bleed the clutch it goes back to normal position/travel.



Any thoughts?

[Uwon]

Try posting on Renntech. More geared to serious 996/997 issues.
Johan

[Dmitry at Pelican Parts]

Hey Ferdzz,

Sorry that you're having so much issue with your clutch. I've attached a link to our tech articles on the 996/997 Transmission. Hopefully the guides will give you a better shot at diagnoising the issue. If you have further questions, feel free to post a Comment just below the article and someone will get back to you with some info.

Porsche 911 Trans Tech Articles - Porsche 911 (1998-2012) Technical Articles - Porsche 996 & Porsche 997 - Pelican Parts


-Dmitry