I have a noise then the clutch is fully released, engine running and the transmission is in neutral. After reading several post on this exact issue I think i have it pinpointed to the clutch fork and and pivot ball as the issue. The throw out bearing is still in contact with the clutch fingers.
My truck is missing the clutch cover plate so it was easy to see. The fork pulls away from the ball pivot easily. I looked in the service manual and one of the inspections for the clutch for is to check that the ball is snug and has no endplay. I’m thinking that no endplay means it can’t pull out of the socket.
Does this sound like the problem? Can the fork be pulled without pulling the transmission?
1952 Chevrolet 3100 w/59’ 235 & hydraulic lifters Original “Three on the Tree” & 4:11 torque tube 12v w/ Alternator
There is supposed to be a C-shaped retaining spring that fits into a groove in the throwout fork where it pivots on the ball. If it's missing, the ball can be pulled forward by the return spring, which, I believe, was also missing on your truck. Unfortunately, it's difficult, if not impossible to remove the throwout fork with the transmission in place. Some ball pivots screw into the bellhousing and have an Allen wrench socket to install them from the back side, but the head of the pivot bolt is usually covered by the front of the transmission. Jerry
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