New problem - the crankshaft pulley that drives the fan and generator is loose - rotates about 15 degrees to and fro. The big bolt in the center of it is hard to get to, but I managed about 1/4 turn on it, it was looser than a bolt that big should be, still probably looser than spec. Pulley still loose, rotates by hand.

I suspect is keyed and key slot in pulley worn out? Or worse crank keyway bad. Any suggestions? Looks like have to pull radiator to get to this area with any ease.

BTW it was a Clark carloader 4000 lb, 1954 model. Has a Continental F-163 motor, not the original per the spec sheet Clark sent me.