[DeTomaso] Clutch woes in Asa's garage
Asa Jay Laughton
asajay at asajay.com
Sun Sep 6 22:35:50 EDT 2009
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As for the piston being almost completely withdrawn...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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