[Healeys] Clutch slave cylinder

Randy Alkins r.alkins001 at comcast.net
Tue Feb 11 15:13:46 MST 2020


Spring keeps piston and cup level in and out of motion.


> On February 11, 2020 at 2:46 PM simon.lachlan at alexarevel.plus.com wrote:
> 
> 
>     I am trying to get my head around the workings of the clutch slave cylinder in my MkII BT7.
> 
>     Plainly the fluid comes in the back, underneath and pushes the rod outwards ie towards the rear of the car.
> 
>        1. So, what is the purpose of the spring behind the piston/rubber?
>        2. Is that (silly little) spring supposed to do anything? It certainly doesn’t seem want to push the piston anywhere……
>        3. With the slave cylinder on the bench, I can push the piston in with my thumb. Bit stiff, but I suppose that’s to be expected. How easy should it be and should it spring back?
>        4. I’ve used a rebuild kit from one of our better suppliers……are these kits problematical? I recall that, for example, the servo rebuild kits were/are notorious.
> 
>     I rebuilt it, reinstalled it and the whole issue was solid as a rock. No movement of the rod at all…..
> 
>     I’m going wrong somewhere. Surprise, surprise! But it seemed like a straightforward task and, barring some access issues, the spanner work is simple enough.
> 
>     Any clues?
> 
>     Simon
> 
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