Clutch Slave cylinder modification to stop leaks.
This is clearly bad design. Master has a joint to allow rod cocking. Slave has none, so those "2 degrees allowance" may be too much (and it is in my car - or, maybe there is something else wrong, I don't know).
But. In power hydraulics world this is unacceptable at all, to tilt the piston and seals!
How can it seal when you cock it? Who designed this?
By the way, the boot should have a vent, check this when you buy a new cylinder...
Now. Modifications. Idea 1 - not tested. Just add an o-ring (brake fluid compatible).
Idea 2 - not tested. Stack the original seals (if you have 2 slaves).
Idea 3 - not tested. Extra piston. Diameter is the same as brake cylinders = 20,6 (or 20,64 mm). But they take too much stroke. And metal can be too hard on the plastic body, bore.
Idea 4 - done, testing (for almost a year now), works great. Custom made piston, plastic (PA - polyamide), plus seal from brake system (drum brake cylinders, from Punto 1). Of course, it takes a stroke space, but there is still plenty of it available for future wear compensation (but it must be checked periodically).
Diameters are maximum. If anyone will ever make this mod, do it a bit smaller (all diameters smaller by 0,05-0,10 mm). It works great, but feels a bit on the tight side. Important thing is, it should push on the center of the original push rod, not crushing the seal.
Animated GIF (click).
There is a grease compatible with brake fluids. Use this during assembly.
- Previous page: New cylinder leaks. Installing tips.
