Hello folks,

I have been thinking about a comment made in a recent thread about adjusting a clutch fork pivot ball so that the fork did not go "past" maximim leverage. With time over Christmas I took a spare 833OD bellhousing and mounted it to a spare 833OD case, then inserted an input shaft and input bearing, an input bearing retainer, and slid on a new conventional (right one) throwout bearing. Then then got a depth micrometer out and measured fork movement towards the driver (as the fork would move on the vehicle) from a known base, the face of the bellhousing as it would contact the block. I adjusted the ball pivot all the way in, then moved it out two turns at a time and measured fork movement and fork centerline angle from perpendicular as the ball was moved out (higher).

I gained an appreciation of the realtionship between ball stud height and fork angle, of course, but my question still relates to the statement made in the thread: that there is an angle past which maximum mechanical advantage is lost. While it seems intuitive that the fork should not pass perpendicular, is this really so? Such a limitation means the ball stud has to be out about 1/2 of its threaded length on my setup, yet the fork will release the clutch even if the pivot is screwed all the way in forcing the fork to move past perpendicular towards the driver.

The range of motion needed to move the throwout bearing 1/2 inch and 3/4 inch into the clutch is less than 1.3 inches, max. (I measured at both depths into the clutch because my fingers are moved at 1/2 inch and clutch release is obvious at 3.4 inch.)

Has anyone else worried over such trivia?
rock
'64d100

The people that designed the linkage knew what they were doing. Use the right parts in good condition and don't worry about it.