[Healeys] Clutch Master Cylinder/Clutch Slip Saga

[Bob Spidell]

Both the clutch and brake master cylinder--Moss, at least, sells the 
same part for both, and they're on sale--is just a piston that pushes 
fluid to the slave cylinder. It has a rubber seal that eventually wears 
and can be replaced. That's it; pressure is relieved when you lift your 
fit and the piston retracts. Both the brake and clutch MCs have a 
spring-loaded non-return valve--sometimes called a 'foot valve'--at the 
end of the pushrod which is essentially a small piston; it opens when 
the pedal is lifted and allows the reservoir to replenish fluid as the 
clutch or brake wears and closes as soon as the pushrod moves inward. It 
it wears or gets damaged the clutch/brakes will not function properly. 
See part# 79 here:

https://mossmotors.com/ahy-035-clutch-100-6-3000

Soooooooo ... what's the story: "(Non-standard rod. Long story)." Were 
you involved?


Bob

On 6/23/2024 5:52 AM, Simon Lachlan via Healeys wrote:
>
> With reference to the slipping clutch &/or overdrive, I do believe 
> thatitis fixed. Said that before and it let me down again. But, this 
> time, I had it done professionally by a local team that I’d never used 
> before.
>
> Anyhow, after my wasting a lot of time and some money checking 
> everything and getting nowhere, these guys said thatthe rod in the 
> clutch master cylinder was too long and they’d had to reduce it’s 
> length. (Non-standard rod. Long story). So,apparently the pressure 
> wasn’t being allowedto bleed back/out and the slave cylinder remained 
> pressurized etcetc.
>
> Now, if that sounds like amuddle, it is and that’s because I’ve never 
> delved into or fully understood the workings of the clutch master 
> cylinder.(Which is why I never thought of it during the whole affair. 
> But nor did anyone else).I know it’s not just a simple pusher, like a 
> bicycle pump, but that’s really all. I googled it and looked into my 
> years’worth ofcollected files of advice and wisdom. But nothing found.
>
> Can someone just explain how the thing works so I can understand what 
> was going on?I should like to close the whole chapter and move on………..
>
> Thanks,
>
> Simon
>
>
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