by Norton » Wed Jul 20, 2022 1:21 pm
Finally solved clutch problem on the -64 "S" type. We like to blame Previous Mechanics, here I have to admit Present Mechanic also was a little out. When I dismantled the slave cylinder I noticed the return spring was missing and ordered that together with a new slave. Putting all back together I adjusted pushrod to same lenght as the one I removed. Also readjusted pushrod BEFORE fitting return spring. It is there to ensure the thrust bearing is not riding on pressure plate. The thing is the piston in slave cylinder was starting to operate the clutch from about midposition. And with no return spring, clutch springs returned piston to that position. With return spring now added that one continued to push piston into cylinder, but at a SLOW rate. Next time piston had to travel a longer distance to release clutch - push twice. ( first push spongy, as it did no real work ). This dawned on me standing under the car while an assistent operated clutcpedal at my command. And thinking throug what I had done and more specific, what I had done differently. ( Return spring ). Pushrod have to be adjusted while piston is at bottom of cylinder with spring off!
I could and can observe that a small amount of fluid is pushed back into reservoir at initial travel of clutch pedal. But I think this is normal. It will happen until the valve ( 42 & 41 on parts list ) closes. Think it need to be open to allow fluid into operating cylinder to keep it topped up.
A lot of unnecesarry work, maybe. But now the whole system is overhauled, cleaned and flushed. Was a lot of dirt in there, and I have a totally overhauled clutch hydraulic!
Harald.
Finally solved clutch problem on the -64 "S" type. We like to blame Previous Mechanics, here I have to admit Present Mechanic also was a little out. When I dismantled the slave cylinder I noticed the return spring was missing and ordered that together with a new slave. Putting all back together I adjusted pushrod to same lenght as the one I removed. Also readjusted pushrod BEFORE fitting return spring. It is there to ensure the thrust bearing is not riding on pressure plate. The thing is the piston in slave cylinder was starting to operate the clutch from about midposition. And with no return spring, clutch springs returned piston to that position. With return spring now added that one continued to push piston into cylinder, but at a SLOW rate. Next time piston had to travel a longer distance to release clutch - push twice. ( first push spongy, as it did no real work ). This dawned on me standing under the car while an assistent operated clutcpedal at my command. And thinking throug what I had done and more specific, what I had done differently. ( Return spring ). Pushrod have to be adjusted while piston is at bottom of cylinder with spring off!
I could and can observe that a small amount of fluid is pushed back into reservoir at initial travel of clutch pedal. But I think this is normal. It will happen until the valve ( 42 & 41 on parts list ) closes. Think it need to be open to allow fluid into operating cylinder to keep it topped up.
A lot of unnecesarry work, maybe. But now the whole system is overhauled, cleaned and flushed. Was a lot of dirt in there, and I have a totally overhauled clutch hydraulic!
Harald.