If you having problems with a two piece, check to make sure the thing isn't two big. Have seen instance where when you install the seal into the block, then just lay the other side on the crank, the damn thing is too big. I clip about 1/8 of or what ever it needed to make it seat correctly. I left enough on there so it still did compress. You can, not see it, torque it down and the torque wrench will still click. It gets nice and tight, but doesn't seal.