The original clutch mechanism was simply a bar joining the pedal to the release lever and was fiendishly heavy: you had to brace yourself against the seatback to move it. I picked up a new air servo on ebay some time ago; I think it's a Man Diesel part
This servo is operated by hydraulics so the pedal needs to activate a master cylinder instead of the old push rod.
I picked up a master cylinder and clevis from these people carbuildersolutions.com
This has (I think) a bore and stroke that will match the servo.
The original clutch pedal needed bending slightly in the vise and thinning down to accept the clevis. I reamed the hole out to 7/16"
and made a brass bushing for the clevis pin
Quite a milestone actually because it is just about the first successful thing I have made on my lathe!
The spring loaded 'captive' pin for the clevis is a really neat idea: mush easier than messing about with split pins.
So flushed with success I made a steel pushrod complete with 5/16" UNF thread cut on the lathe (woohoo!)
The whole thing sits on the truck like this
I'm not sure that I have the pedal stroke correct but it will be good enough to get started. It's difficult to tell without the cab on and the other pedal fitted and so on.
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