Hello,

I’m moving ahead slowly. The gearbox is back in, with new hydraulic release bearing.

Now I have an issue with the master cylinder. With help from friends, we tried to bleed the pipes. We got the air out. But it takes a few pumps of the pedal to get the bearing to release. After these few pumps, and the pedal held down, the clutch remains released for at least a minute. To test for release, the prop shaft was tuned by hand while in gear. But then, if the pedal is released from the floor, the next stroke has no pressure. It seems to hold built up pressure, but the pressure instantly disappears on the next stroke.
I hope I’ve explained this okay.
Before ordering a new master CAC8091, I thought I’d see what’s going on inside.
The pictures show the black cast master that was in there, that came with the Keisler kit, and the alloy one is an old Jag one.
I don’t understand how the cast one works. There’s no return spring, and it has a small valve on the tip that seems to vent fluid from the tip to the middle of the piston. The valve seems to be closed under pressure, and open during release stroke.
Reading older posts, folks have said they prefer the Jag type.
I’ll likely buy a new Jag one, but I’d like to know if anyone has a comment.
Thanks,
Rob

 

Hi Robert,

That looks very impressive! Are you turning an automatic into a manual? Is that a V12?

I have a simple 3.6, manual. I changed the original Jag master cylinder a year or so back. It had lasted 30 years and 138,000 miles so pretty good longevity. Not sure what the alternative version is but the Jag one seems to last pretty well and parts are available so I would stick with the original but others may know more that I.

Good luck with it.

Cheers,
LeeP