[DeTomaso] Shifting

[Larry - Ohio Time]

Ok Mike the rest of the story:

 

I installed a dial indicator on the slave to determine the travel during
different times and temperatures. Wanted to make sure it was not a problem
after the slave. It was not the slave travel would decrease.

 

I started by bleeding, pressure, vacuum, and pumping. Worked great till hot.

 

I replaced the red plastic line. Worked great till hot.

 

I rebuilt the slave. Work great till hot.

 

I replaced the clutch Master. Worked hot and cold.

 

 

Larry (anal) - Cleveland

 

 

 

 

From: MikeLDrew at aol.com [mailto:MikeLDrew at aol.com] 
Sent: Monday, February 03, 2014 10:18 PM
To: Larry at ohiotimecorp.com; pcajthaml at gmail.com; detomaso at poca.com
Subject: Re: [DeTomaso] Shifting

 


In a message dated 2/3/14 11 59 1, Larry at ohiotimecorp.com writes:






I had a friends 72 that would loose slave travel when it warmed up. It got
so bad you had to double pump the clutch to shift when hot.
 
It turned out to be the clutch master, I did not think it would get that hot
in there.



>>>As to your friend, I would guess, right cause, wrong conclusion.

I would say the problem your friend had was simply air in the lines.  As the
car heated up, the air expanded and the hydraulics lost effectiveness.

When you change the master cylinder, you necessarily purge and bleed the
system.  Hey presto, it works now!  However, I suspect that purging it with
the old components in place would likely have had the same effect.

When a clutch master fails, it's not temperature-dependent.  Often the pedal
will feel fine one time, and the next time you step on it, it just plunges
to the floor with no clutch actuation, and then the next time, it works.
The symptoms you describe (heat-related failure) where there is a clear
relationship between temperature of the components, and their effectiveness,
almost always points to simple air in the system.

Getting all that air out can be a PIA.  One thing some people forget is that
the bleeder has to be at the high end of the system.  I've seen a clutch
slave installed inverted, so that the line came in the top and the bleeder
was beneath it.  Yes, he had problems too, until we flipped it around....

Mike

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