Hey all, installing a new clutch with the engine re-build. Have been having trouble with slipping the clutch in the past so I opted for the slightly larger 9.25 inch flywheel and clutch kit instead of the stock 8 7/8". I bought a brand new LuK flywheel and the Aisin Clutch kit.

When I get the clutch installed on the engine, the pressure plate fingers go almost all the way flat, much flatter than the stock clutches I have seen. Is this normal? I've found differing opinions online.

This discussion came to light when I had installed everything back in the truck and was going to tighten the crank pulley bolt, at around 50 ft lbs, I was spinning the crank and the transmission wouldn't hold. My deduction is that the clutch isn't holding, and so now I'm trying to understand why. I don't suspect pressure from theslave cylinder/throwout bearing, since when I pushed the fork as to completely remove the throwout bearing from the diaphragm springs the issue persisted.

Pics below are either from the new clutch pack, or form the old clutch (wrecked and overheated) but reassembled to the old flywheel.

New 9.25 inch clutch and flywheel, very flat fingers when installed. When the bolts aren't screwed in, the springs stick out more.

Old clutch, fingers stick out a lot more, and don't change position when installed.

What is it I'm not understanding about this system?

 

Hah,... as with all things, I got moving too fast.

Nothing wrong with the clutch at all (so far as I can tell) However, when you try and torque down your Crank Pulley bolt, make sure the Truck is in a HIGH gear, not first or reverse..... Oh well, at least we're moving forward again