[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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