Jack W. wrote:
> I drove all day today and not a single slip
I meant to reply a day or so ago but got kinda' busy. I went through a
spell with my Spitfire's clutch slipping once the car got hot. The solution
at the moment was to crack open the nut holding the hydraulic line in the
master cylinder, releasing the pressure. I could usually hear it go
"clunk". Obviously the clutch wasn't releasing fully, so that subsequent
presses would push the slave cylinder further out.
The interesting question was why. The explanation I finally settled on was
that pressing the slave cylinder beyond a certain point caused it to stick.
Maybe it was due to friction inside the slave cylinder, or maybe the spring
inside would hang up on itself somehow.
The curious result was that the obvious long-term fix was the wrong thing to
do. The Spitfire slave cylinder can be moved a little in or out in its
mount. One would think that to prevent clutch slip one should move the
slave cylinder out. But this moved the slave piston's range of motion
further along the cylinder, increasing the tendency to stick. The correct
fix was to move the cylinder in its mount inward toward the clutch, thus
moving the piston's range of motion back toward the open end of the
cylinder. Knock-on-wooden-dash I haven't had a problem since.
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire (Percy)
'70 GT6+ (Nigel)
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