Has anyone heard of this one??...

It sounds like the master cyl is by-passing.

A one way valve would not allow the fluid in the slave cyl to return to the master cyl, which would keep the clutch disengaged.

John

Thanks John, Can you translate "by-passing"...

quote:

Can you translate "by-passing"...

Not keeping the fluid in front of the rubber piston cup, but allowing it to bypass the cup.

Like what was happening with my clutch MC just this week -

Larry

The odd thing is... it seems to be related to the RPM... I can sit here w/the engine at idle a pump the clutch pedal many times w/no issue??... I really, really don't want to pull this gearbox. I'm just starting to enjoy the car. First the vibration now this. I better wrap my mind around the idea of pulling it out... not my mind, the gearbox...

quote:

I can sit here w/the engine at idle a pump the clutch pedal many times w/no issue??

What happens when you do this at 3k rpm?

Did you ever solve your vibration problem?

John

The vibration is still there, although lately it seems to lesson at 3400 and up, the car just runs awesome at 35 or 3600. The reasons to pull the tranny are stacking up. I'm going to mess w/it a bit more in the morning, see what I can learn.

Well, I just did an hour run with about five miles at 4K. This baby humms right along at 4K so nice!! I tried kicking it neutral about 50mph and hold the revs at about 35, 3800 and I cannot replicate the clutch issue. When the clutch spins up the car vibrates alittle, when the clutch spins up the pedal goes whacky... I guess I'm pullin' the tranny. I will limp around on it until I get a clutch budget...

PLT-1 Did the half - shafts come assembled?
The first [ 2 ] things i would check would be:
[Both very easy [ 5 ] minutes to check both.
1] "U' Joints [obviously].
Check for any looseness in the joint and or
rust around the cups.
2]Phase on the 1/2 shafts.
[on the slip yolk end look for arrows [or some other type of marking] and make sure they are aligned on the shaft side AND the slip yolk side.
JOHN

After checking the halfshaft issues that John suggests, try tightening ALL 16 halfshaft bolts! We've found that even one bolt only partially tightened can cause a severe vibration around 3500. So far, three owners have found and cured a vibration by simply tightening the bolts. And I don't mean 300 ft-lbs; just tighten them all to the same torque. One car developed such a vibration without any work having been done on it. I found a cracked lock-washer (over half was gone). Adding a new washer to that one bolt, retightened, and magically, the vibes went away!

Thank you guys very much for your learned advice ... I purged the hyd clutch system of all the silicone fluid, I marked, then increased the clutch throw by one spline. I was not able to lean on the car hard enough during a quick ops check but, the clutch feels better and shifting seems to feel better also... Stay tuned...

Thanks to all for their help and advice... Many thanks to Dennis Quella who advised against the silicone fluid in my hyd clutch system. I have ops checked the system thoroughly and the whacky progressive clutch pedal issue was apparently due to the silicone fluid. Thank you Dennis Quella