[DeTomaso] Clutch Master Cylinder and Shackle

Art Stephens artstephens at charter.net
Mon Jun 9 18:48:05 EDT 2008


Dan,
     Using a hole saw to make an access hole in the passenger side of the 
pedal box,  makes clutch master linkage work much easier.  I made mine 
either 2 or 2.25 inches,  if I was to do it again,  I would make it 2.5"

Art


----- Original Message ----- 
From: "Daniel C Jones To: detomaso at realbig.com List-Subscribe:" 
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Sent: Monday, June 09, 2008 9:18 AM
Subject: [DeTomaso] Clutch Master Cylinder and Shackle


>I had finished setting timing and installing the wide-band O2 last night 
>and
> wanted to take the Pantera for a drive to get some baseline air-fuel 
> mixture
> readings.  I'd made it to the interstate when the clutch got very stiff at
> the top of it's travel (engaged, foot off the pedal).  I gave it a strong 
> push
> and suddenly I had no pedal.  I was maybe 20 miles from home with a
> bunch of lights and stop signs along the way.  30 years ago when I was
> learning to drive, my dad had the foresight to not only teach me how to
> drive a manual transmission but also how to shift without using clutch.
> That came in handy last night.  I managed to make it home only once having
> to start the car in gear at a light.  They've started to install walk/no 
> walk
> lights with timers that count down to when the lights change which was 
> nice
> for timing the lights.
>
> When I got it home, I crawled under the dash and found out what went 
> wrong.
> The previous owner had installed a CNC clutch master.  It had a fair bit 
> of
> free play before any resistance was felt and I found out why.  It appears
> the shackle was only threaded one or two turns (threading it all the way
> down would have taken up the free play) and it stripped out.
>
> Several questions:
>
> 1. Is the CNC clutch master metric or SAE?  It appears the fitting on
>    the hydraulic line was replaced so I wonder if that was to convert
>    from metric to SAE and a second 90 degree fitting added.  If the 
> fitting
>    on the CNC is SAE, then is the stud also SAE?  Perhaps a thread
>    mis-match was why the shackle was only retained by a thread?  If I
>    re-flare the line to install an original clutch master, what
> fitting do I need
>    and what is the flare angle?
>
> 2. What is the thread size of the shackle (would be the same as the
>    stud on the back of the original clutch master)?  I can thread a
>    7x100 metric bolt several turns but the threads in the shackle
>    appear more coarse.  Perhaps the previous owner ran an SAE tap
>    through the shackle?
>
> Getting the clevis back in looks like it's going to be treat.
> Does anything keep the stud from rotating on the clutch master
> (maybe just friction from the piston)?
>
> Dan Jones
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