Quote:
Originally Posted by Jim Coleman
I just ordered another clutch master cylinder in 7/8" to match the 7/8" slave.
Thought the one I have was 3/4" -- it is 5/8".
Sure hope this fixes it...….
Thanks,
Jim
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Jim
I recently did what you are doing. My clutch is a 12” McLeod Super Steet Pro, 75236 I think and the actuating slave is 1” bore. It’s operated via a conventional external Ford (FE) Fork, which is around 2:1 ratio. The clutch fingers need, upon contact 0.500” movement to release the clutch. You want some free play finger/bearing for clearance and to accommodate wear over time, you should bank on 0.625 travel at the clutch bearing end. That means 1.25” travel at the slave due to the ratio. My master cyl in the pedal box gives 1.25” max, so I couldn’t use a smaller master than slave. Hence both my masters and slave are 1” bore, which I was pretty unhappy about. When I first pressed the clutch, I thought I had damaged my back, but now the car is in the road it’s not problem at all. There’s a lot of drama in driving a Cobra and a hard clutch you get used to quick.
To test the clutch works, as others have doubltless said, first check the fork is moving when you depress the clutch. Then put the car in top gear with the rear wheels raised. Remove the plugs, drop a little
oil in the bores if you like, a tablespoon max and turn the motor in the right direction with a wrench on the crank pulley nut. If the wheels turn, clutch is engaged. Then do same with somebody depressing the clutch pedal all the way down.The rear wheels should not turn. If they do clutch isn’t releasing. Whether it’s external fork or internal HTOB it either isn’t near enough to the clutch fingers of something has failed.
In that case make it easy on yourself. Drill a 5/8” inspection hole in the bellhousing that you can plug with a plastic grommet. Then you can shine a torch and see what’s happening. You should do this in line with the flywheel face. Then you can alternatively insert a feeler gauge to check the clutch release. You should have a measurement in the instruction for this. I think mine was .050”