[DeTomaso] Clutch help

John Taphorn jtaphorn at kingwoodcable.com
Fri Jun 25 19:47:44 EDT 2010


Tom

You require more clearance.  A long throw covers up a lot of adjustment 
problems.  If you would like, send me a pic of the slave attachment to the 
fulcrum on the clutch lever and I'll offer an opinion on the setup.

JT
----- Original Message ----- 
From: <tmshinro at aol.com>
To: <detomaso at realbig.com>
Sent: Friday, June 25, 2010 6:24 PM
Subject: [DeTomaso] Clutch help


>
> First I want to thank everyone that sent me suggestions.   I'm still 
> trying to figure it out but I have a couple more questions.
>
> I started the car the next morning to move the car forward in my garage 
> after I experienced clutch drag the night before when I pulled the car in 
> the garage .  Everything worked fine; I was able to shift into all gears 
> while stationary with the engine running.  When I depressed the clutch 
> pedal I could "feel" the clutch disengage well before the bottom of the 
> stroke.  The clutch engaged about half way up when I pulled the car 
> forward and totally disengaged when I pushed the clutch in when I stopped. 
> I didn't take in out because I know I would see clutch drag after 10 to 15 
> minutes of driving based on numerous prior test runs.
>
> Here's my question - I measure 0.020 inches of clearance between the 
> clutch disk and pressure plate.  I don't see any separation between the 
> clutch disk and the flywheel, but when I move the car by hand with the 
> clutch pedal depressed I can see the clutch disk move between the flywheel 
> and pressure plate.  Should I be seeing measurable separation at the 
> flywheel as well as the pressure plate?   From what I have been told I'm 
> don't have as much separation as I should (0.020 vs 0.030), so I'm 
> wondering if things are expanding when hot and consuming what little 
> clearance I have.  Unfortunately, I can't get anymore clearance unless I 
> use up all my free play (which I've cut down to about 0.060 inches).   Is 
> there enough heat/expansion between the flywheel/clutch/pressure plate to 
> make a difference?
>
> Also I should mention that the clutch master I installed was one I bought 
> 10 years ago from Collectors Choice.  The MC sat in my tool chest with the 
> outlet plugged the whole time time.  I live in Iowa so there were plenty 
> of humid days that the MC would have seen in my garage.  I disassembled it 
> prior to assembly and the bore and seals looked good and I could tell that 
> the seals were tighter that my old one when I manually pushed the push rod 
> into the bore. I took the MC out a second time to measure the pushrod and 
> did not see any fluid leaks in the rubber boot.  However, when I bled the 
> system, the fluid that came out of the bleeder looked clear through the 
> plastic tube I used but was dark once it was collected in a plastic 
> bottle.  Is it possible that the seals could have deteriorated causing 
> blow by?  Would it make sense that blow by would get worse after cycling 
> the clutch for 10 to 15 minutes?  The fluid in the reservoir is clear.
>
> Unfortunately I didn't think about measuring the bore of the new MC and 
> comparing it to the old.  I'm assuming they are the same, which if they 
> are, baffles me because I never had clutch problems before this.
>
> The battle goes on.
>
> Tom
> #5186
>
>
>
>
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