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Diaphragm clutch


Perfect 65

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My 1500 Spit has a diaphragm clutch I believe. The car has been off road for a few years and when I filled and bled out the clutch system using all new parts on the hydraulic side it was stuck. I chocked the pedal overnight and next day it eventually freed up. It now works ok up to a point with gears sliding in and out silently but there seems to be quite short travel from floor to 'bite'. Is this a characteristic of the diaphragm clutch?  - Dave
Ps. just read another thread and there was mention of 2 different piston sizes for the slave cylinder. Could I have received the wrong slave when I purchased my parts?

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Yes got pedal spring in place and had a look for some reference to piston size in the threads, other than there are two different diameters, but no joy. So many threads but no actual piston size. Would like to eliminate this possibility while carrying out the other checks I have read about on this site.  Could also be a small amount of air in the slave after bleeding due to inclination of the engine - will check this also. Regret ditching or mis-laying the old slave to use as a comparison. Thanks for your comments so far.

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4359 wrote:
Yes got pedal spring in place and had a look for some reference to piston size in the threads, other than there are two different diameters, but no joy. So many threads but no actual piston size. Would like to eliminate this possibility while carrying out the other checks I have read about on this site.  Could also be a small amount of air in the slave after bleeding due to inclination of the engine - will check this also. Regret ditching or mis-laying the old slave to use as a comparison. Thanks for your comments so far.


...and make sure the bleed nipple is at the top

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4359 wrote:
My 1500 Spit has a diaphragm clutch I believe. The car has been off road for a few years and when I filled and bled out the clutch system using all new parts on the hydraulic side it was stuck. I chocked the pedal overnight and next day it eventually freed up. It now works ok up to a point with gears sliding in and out silently but there seems to be quite short travel from floor to 'bite'. Is this a characteristic of the diaphragm clutch?  - Dave
Ps. just read another thread and there was mention of 2 different piston sizes for the slave cylinder. Could I have received the wrong slave when I purchased my parts?

Just found the info on slave cylinder piston diameter on Rimmer Bros. parts list - the 1500 with diaphragm clutch has a 7/8" diameter piston. When I next get to the car I will run through all the tips gleaned here and check the slave cylinder piston diameter. However, if I have the wrong slave, ie 3/4" piston, the lift would be greater and not less so I dont think mine is wrong. Also, bleed nipple is at the top.

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