Subject: [Fot] Slave cylinder/master cylinder

From: McKearn McKearn via Fot <[email-masked]>
Date: Sat, 27 May 2023 10:01:09 -0500

--===============1566407277249789062==

--00000000000053dd2205fcae2070

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?

--00000000000053dd2205fcae2070
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi all.<br><div>=C2=A0 Got the GT6 out a few days ago and =
remembered that I was going to fix the clutch problem I had last fall befor=
e I stored it away=C2=A0 =C2=A0but did&#39;nt=C2=A0..</div><div>=C2=A0So lo=
ng story short, I don&#39;t know if it&#39;s the slave cyl or master cylind=
er but it works fine at first few shifts but as you drive it you get less a=
nd less clutch movement.</div><div>Seems like if you let it set a while it =
will work=C2=A0 again..</div><div>=C2=A0Any ideas?</div></div>

--00000000000053dd2205fcae2070--

--===============1566407277249789062==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

--===============1566407277249789062==--

---

From: J Wagner via Fot <[email-masked]>
Date: Sat, 27 May 2023 11:09:38 -0700

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 <[email-masked]> wrote:
> 
> Have you tried bleeding it?
> 
> Sent from my iPhone
> 
>> On May 27, 2023, at 11:16 AM, McKearn McKearn via Fot <[email-masked]> 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.
>> Donate: http://www.team.net/donate.html
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]
>> 
>> 
> 
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]
> 
> 

Donate: http://www.team.net/donate.html
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]

---

From: Greg Hilyer via Fot <[email-masked]>
Date: Sat, 27 May 2023 13:18:33 -0600

In my never ending quest to overthink things, I’m curious about the symptoms…
Is it losing free-play (engagement at the top of pedal travel) or getting too much (pedal gets lower and lower)? 
Since you say “first few shifts”, it doesn’t sound to be heat related - can you induce the problem by just pushing the clutch a few times while stationary?
If it’s not as simple as bleeding &/or bad seals I’m thinking of other less obvious scenarios I’ve run into. 
Greg “Lunker” Hilyer
Albuquerque NM

> On May 27, 2023, at 9:08 AM, McKearn McKearn via Fot <[email-masked]> wrote:
> 
> 
> Hi all.
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked]

---

From: J Wagner via Fot <[email-masked]>
Date: Sat, 27 May 2023 13:02:26 -0700

--Apple-Mail-611CE5CB-1648-49FB-A6FF-ABB2D0751C29
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

And there=E2=80=99s always=E2=80=A6.

--Apple-Mail-611CE5CB-1648-49FB-A6FF-ABB2D0751C29
	name=IMG_0837.gif;
	x-apple-part-url=157A3191-6CDD-4DD7-8CB1-D92EDB587DD0
Content-Disposition: inline;
	filename=IMG_0837.gif
Content-Transfer-Encoding: base64

--Apple-Mail-611CE5CB-1648-49FB-A6FF-ABB2D0751C29
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

> On May 27, 2023, at 12:57 PM, Greg Hilyer via Fot <[email-masked]> wro=
te:
>=20
> =EF=BB=BFIn my never ending quest to overthink things, I=E2=80=99m curious=
 about the symptoms=E2=80=A6
> Is it losing free-play (engagement at the top of pedal travel) or getting t=
oo much (pedal gets lower and lower)?=20
> Since you say =E2=80=9Cfirst few shifts=E2=80=9D, it doesn=E2=80=99t sound=
 to be heat related - can you induce the problem by just pushing the clutch a=
 few times while stationary?
> If it=E2=80=99s not as simple as bleeding &/or bad seals I=E2=80=99m think=
ing of other less obvious scenarios I=E2=80=99ve run into.=20
> Greg =E2=80=9CLunker=E2=80=9D Hilyer
> Albuquerque NM
>=20
>> On May 27, 2023, at 9:08 AM, McKearn McKearn via Fot <[email-masked]>=
 wrote:
>>=20
>> =EF=BB=BF
>> Hi all.
>> Got the GT6 out a few days ago and remembered that I was going to fix the=
>> So long story short, I don't know if it's the slave cyl or master cylinde=
r but it works fine at first few shifts but as you drive it you get less and=
 less clutch movement.
>>=20
>>=20
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/lunkercars@=
yahoo.com
>=20
>=20
>=20
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/4msonset@gma=
il.com
>=20
>=20

--Apple-Mail-611CE5CB-1648-49FB-A6FF-ABB2D0751C29
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

--Apple-Mail-611CE5CB-1648-49FB-A6FF-ABB2D0751C29--

---

From: Greg Hilyer via Fot <[email-masked]>
Date: Sat, 27 May 2023 14:09:59 -0600

Yep… That was definitely on my list of possibilities.
Seems we (over) think in similar ways Justin.
Greg “Lunker” Hilyer
Albuquerque NM

> On May 27, 2023, at 2:02 PM, J Wagner <[email-masked]> wrote:
> 
> And there’s always….
> 
> 
> 
>> On May 27, 2023, at 12:57 PM, Greg Hilyer via Fot <[email-masked]> wrote:
>>