[DeTomaso] Clutch woes in Asa's garage

David & Marilyn Bell davidabell at worldnet.att.net
Mon Sep 7 02:04:55 EDT 2009


At the risk of stating the obvious, why not just yank the spring out of the
inside of the slave cylinder.  Mine doesn't have one and doesn't need one.

Dave Bell

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Asa Jay Laughton
Sent: Sunday, September 06, 2009 9:36 PM
To: detomaso at realbig.com
Subject: Re: [DeTomaso] Clutch woes in Asa's garage


Mike,

I love you man... but it feels like I'm beating a dead horse.

First, the obvious.  I can't get a power bleeder on it.  So first, I
used a vacuum system to pull fluid through, then Shelley and I bled the
system by foot/hand to the point we'd sent the -same- fluid through
twice with no bubbles.  Pumping up the clutch has no affect, i.e.
several pumps gets me the same travel as one.

As for the piston being almost completely withdrawn... no chance in
hell.  The internal spring pressure (inside the slave cylinder) is
enough to keep the piston at the very outboard end of the cylinder, with
nothing else assembled.  When everything is assembled, the external
spring is fighting the internal spring and in most cases, the internal
spring wins.

Chuck's video of the slave movement is -nothing- like what I am able to
get, especially with the external spring removed.  If I remove the
external spring, I can't seem to get nearly any movement of the piston
back into the cylinder.  I honestly am beginning to believe this is why
my clutch was burned up to begin with.

Lord I sure could use another expert on site with me to validate my
insanity.  It's not rocket science, I've done this before on other
cars.  Yes, I'm feeling really stupid at the moment because I can't get
it to work, and I've gone through step by step, again and again.  It's
like I'm missing something obvious, but can't see it.  But then, I can't
be sure because my clutch was toast when I took it apart.  So maybe it
never -was- working quite right.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1971 Mach I Mustang  [ASA JAY]
1973 Pantera L 5533  [ASASCAT]

******************************
http://www.asajay.com
http://www.teampanteraracing.com




MikeLDrew at aol.com wrote:
> In a message dated 9/6/09 18 41 1, asajay at asajay.com writes:
>
>
>
>> Well, that's two people who have said the same thing.  So then my CNC
>> replacement should give me the same amount of throw as a stock unit.
>> What gives.
>>
>>
>
> At the risk of suggesting the obvious, I've seen exactly this type of
> scenario in action before.   The cause was a bunch of air in the clutch
line due
> to improper/inadequate bleeding.   I bled my clutch with a pressure
bleeder,
> and found that I had to depress the pedal about halfway in order to get
> fluid to flow.
>
> FWIW....
>
> You should set up your system so that the piston inside the slave is
almost
> completely withdrawn into the slave, and the fingers on the clutch fork
are
> almost but not quite touching the throwout bearing.   This will give you
> the maximum effective stroke for a given amount of pedal travel, while
> preserving the free space necessary between the clutch fork and throwout
bearing.
>
> Mike
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