While you are looking around the crankshaft, check the pilot bushing for wear. The inner bore should be smooth, like the bearing surface on the transmission clutch shaft.
Harvester
I watched a fella take a pilot bushing out of a crankshaft once.
He squirted a bunch of grease into the pilot bearing, filling the crevice behind the bushing. He found a 3/8" extension that just fit inside the bushing. Wrapping a rag around the extension and holding it close to the flywheel, he gave the end of the extension a good whack with a hammer. The hydraulic pressure popped the pilot bushing out slicker than snot.
Chris