Question about SX clutch torque capacity

[harringtondav]

A few years ago I bought a prop with a RubX and was using a 1/2" drive ratchet with the drive in gear to set the hub. I was surprised when I turned the prop shaft in either F or R. The plate clutch was slipping. I know my 250 hp 4.3 produces well over 300 ft/lb torque and I didn't come close to that with my ratchet.
The drive holds full power hole shot torque w/o any slippage. I have the DX service manual and see an eccentric cam forces the plate clutches to engagement.
My question is if the clutch engagement gets self actuating assist from the input pinion torque or elsewhere?

 

[Scott06]

A few years ago I bought a prop with a RubX and was using a 1/2" drive ratchet with the drive in gear to set the hub. I was surprised when I turned the prop shaft in either F or R. The plate clutch was slipping. I know my 250 hp 4.3 produces well over 300 ft/lb torque and I didn't come close to that with my ratchet.
The drive holds full power hole shot torque w/o any slippage. I have the DX service manual and see an eccentric cam forces the plate clutches to engagement.
My question is if the clutch engagement gets self actuating assist from the input pinion torque or elsewhere?

the cones are drawn together when running so not running that wont happen and lock tight. The same things happen when they get worn and the groves/surface finish on the clutch cones gets worn they either take a while to lock in gear or they slip .