Clutch slave failures...WTF?
Posted: Thu Jun 02, 2022 11:47 am
Hey all!
Frank has been running great since built but I'm having a very frustrating issue.
Two weeks ago, I attended an AutoX, but at the end of my second run, my clutch slave
failed as I was returning to grid.
I assumed it was something I did when I built the car as I has shortened the nose of the slave a bit, to be just like the LPR slaves.
This allows one to get the slave in and out without fully compressing the clutch. But the failure was with the outer O-Rings, not the inner.
I replaced the slave with a new LUK unit and was a bit surprised that it also went in without compressing the clutch further.
Last weekend at the spring Maryhill Hillclimb, I was returning to grid after my first run and the slave failed again in the same manner.
End of my weekend
Is there something causing the slave to extend too far? A combination of a thinner flywheel (from surfacing) and a thicker friction disc (SPEC Stg 2+)?
The thicker disc appears to make the PP compress further, requiring more throw? The PP is a stock AP unit for a 9000T.
I'm thinking of spacing out the PP by adding a washer between the PP and flywheel.
Also thinking of adding a stop to the pedal to prevent overextension.
Has anyone else had this issue? I have a bag of rebuild kits, so I'll rebuild this slave, but I really need to figure out WTF is going on here.
37 years of 99s/900s and these are my first slave failures.
Frank has been running great since built but I'm having a very frustrating issue.
Two weeks ago, I attended an AutoX, but at the end of my second run, my clutch slave
failed as I was returning to grid.
I assumed it was something I did when I built the car as I has shortened the nose of the slave a bit, to be just like the LPR slaves.
This allows one to get the slave in and out without fully compressing the clutch. But the failure was with the outer O-Rings, not the inner.
I replaced the slave with a new LUK unit and was a bit surprised that it also went in without compressing the clutch further.
Last weekend at the spring Maryhill Hillclimb, I was returning to grid after my first run and the slave failed again in the same manner.
End of my weekend
Is there something causing the slave to extend too far? A combination of a thinner flywheel (from surfacing) and a thicker friction disc (SPEC Stg 2+)?
The thicker disc appears to make the PP compress further, requiring more throw? The PP is a stock AP unit for a 9000T.
I'm thinking of spacing out the PP by adding a washer between the PP and flywheel.
Also thinking of adding a stop to the pedal to prevent overextension.
Has anyone else had this issue? I have a bag of rebuild kits, so I'll rebuild this slave, but I really need to figure out WTF is going on here.
37 years of 99s/900s and these are my first slave failures.