[Fot] Slave cylinder/master cylinder

[McKearn McKearn]

Hey friends.
Just wanted to give an update on the clutch thing.
  I took some wise advice and sucked all the black crap out of the master
cyl. then wiped it clean and ran about a cup of fresh fluid through.  I
opened up the slave cyl. and drained out as much as I could. then refilled
and bled everything.
   Seams perfect  now but then it felt perfect before too.
There was no sign of leakage anywhere so the external seals must be fine.
I'm a bit suspicious of the slave cylinder I replaced last fall as it was a
BP Northwest product. Some sort of Asian knockoff.   I guess we will see
what comes to pass.
               Thanks for the replies.
                                   P.J.
Looking forward to seeing you all at the K cup


On Sat, May 27, 2023 at 6:12 PM Bob Kramer Gmail via Fot <fot at autox.team.net>
wrote:

> I don’t know why the fluid in the clutch master cylinders gets nasty so
> quickly, but it does. I start my CMC bleeding process by sucking out all
> the old fluid from the reservoir, wiping it out and filling with fresh
> fluid. I make sure to use all the first fill in the bleeding process so I
> know all the older fluid has passed out of the slave cylinder.
>
> Sent from my iPhone
>
> > On May 27, 2023, at 1:46 PM, J Wagner via Fot <fot at autox.team.net>
> wrote:
> >
> > 
> >
> > Yes, assuming the seals are sound, as suggested, simple bleeding could
> be the fix.  Water/Air in the system, expanding with heat,  could be taking
> up some of the pressure required to release the clutch.  (Think brake fade.)
> >
> > And how old are the seals in the cylinders?  Maybe the general thermal
> expansion in the cylinders and/or heated fluid and rubber, is just enough
> to cause some failure of aging seals?
> >
> > While it’s messy, and it’s been a while for my 4A, after an initial
> bleed at the slave to just get the system filled with fresh fluid, I used
> to bleed the master before a final bleed of the slave, by loosening the
> line ahead of the slave (with the slave nipple closed) as if it were a
> bleeding nipple.  (loosen, push, hold, tighten, repeat… clean up fluid as
> it’s a blind bleed into a rag)  Then do a final bleed at the slave nipple.
> That always seemed to make it all go faster, relatively effortless.   (I
> always thought to make some sort of custom bleed screw between the master
> and slave, but never did.)
> >
> > Between owning British cars, doing my own plumbing for decades, and
> working water gag special fx in the film buiz, I feel like I should get an
> honorary PhD in general hydraulics, though, I am quite aware, I still only
> know .002% about them.  Ok, even less.
> >
> > —Justin
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >> On May 27, 2023, at 9:36 AM, Philip Gott via Fot <fot at autox.team.net>
> wrote:
> >>
> >> Have you tried bleeding it?
> >>
> >> Sent from my iPhone
> >>
> >>>> On May 27, 2023, at 11:16 AM, McKearn McKearn via Fot <
> fot at autox.team.net> wrote:
> >>>
> >>> 
> >>> Hi all.
> >>> Got the GT6 out a few days ago and remembered that I was going to fix
> the clutch problem I had last fall before I stored it away   but did'nt ..
> >>> So long story short, I don't know if it's the slave cyl or master
> cylinder but it works fine at first few shifts but as you drive it you get
> less and less clutch movement.
> >>> Seems like if you let it set a while it will work  again..
> >>> Any ideas?
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