hacker-pschorr

Well, like I mentioned in the links listed above. My clutch would work off / on with temperature too. It was not a hydraulic issue.

Could it be an issue with your fluid system? Sure. But changing out the master is the single hardest job on these cars (I'd rather pull the heads again). Just my $.02

hupp

nosnow,

Check your pedal adjustment before you decide to do anything major!

My 5-spd was doing the exact thing your shark is doing and every part in the clutch is new (mechanical and hydraulic). I finally determined that my master was not backfilling properly. My original thinking was that the drag was due to fluid temp for some reason, but it was basically related to clutch useage -- you've cycled the clutch enough to pump some air in the master by the time the car is warm.

My WSM stated that the pedal rod should have one turn of pre load. For kicks (after trying everything else), I adjusted adjusted for .5mm "slack" as per WSM for other 5-spd models. Bled the system again and she has worked perfectly for weeks now. My only guess is that the aftermarket FTE master I installed differs slightly from OEM and requires the slack adjustment.

It would also be worth while to check your blue hose installation. Make sure everything is moving "downhill" and you did not accidentally create any "P-Traps" that would hamper the gravity flow of fluid.

Dennis Wilson

Scott,

Good point about the aftermarket master cylinder. Did the FTE come with a rod or did you need to use the old one?

Dennis

hupp

Dennis,

My memory could be wrong but: The FTE master came with a rod, but without the lock nut and end piece that connects to the pedal. These had to be re-used.

Dennis Wilson

Scott,

Slight differences at the end of the rod mating to the MC would account for the different preload adjustment. The reason I ask is that my 931 (same clutch hydraulics as the 928) feels as if it has too much preload since it disengages about 1.5" front the top. My 928 is set at 1 revolution preload and the clutch is great. Guess I need to back the 931 off a bit.

Dennis

hupp

Dennis,

My thinking is that the FTE master piston must be allowed to rest against the washer/circlip when the pedal is up to allow for proper backfill. When applying one turn of pre-load the piston is hald off of the washer when at rest, which I believe may restricting the clutch fluid port.

Does the 931 have a single disc, or is it double like the 928? If single, this may be why it releases near the top of the pedal travel. From what I have gathered, the double disc set-ups catch right off the floor due to the very small clearances when released. No amount of preload can change this in my opinion.

Here is my observation. (1.) When the clutch is released, the IP can only move as much as the "T's" allow it to. (2.) the PP friction disc will only move toward the rear of the car a small amount due to thicker liner springs bouncing it off of the IP. (3.) Any additional travel only creats a larger gap between the PP and PP friction disc, which is not by much. Moral of the story, 3 of the four clearances remain very small and constant even with additional travel. The PP gap gets chewed up very quickly once the release arm starts to engage and clutch will always feel like its grabbing close to the floor --- until the discs begin to wear and all of the clearances begin to open up.

Dennis Wilson

Scott,

Not sure what the 931 has since it was changed before I bought it. The 81 931's did come from the factory with the 928 part number. I've changed the slave and it is OEM.

Good reasoning on the mechanics.

Dennis