What was found
IN FLIGHT ENG SHUTDOWN, DUE TO SEPARATION OF CRANKSHAFT COUNTERWEIGHT. THIS CAUSED BOTH LWR ENGINE MOUNTS TO FAIL AS WELL AS SUBSTANTIAL DAMAGE TO CRANKSHAFT AS WELL AS CAMSHAFT, CYLINDERS, CASE, LIFTERS, RODS, ETC. THIS OCCURRED IN FLIGHT, PILOT EXPERIENCED EXTREME SHAKING FOLLOWED BY THE ENGINE "SEIZING UP". HE WAS ABLE TO FEATHER THE PROP AND LAND UNEVENTFULLY AT AIRPORT UNDER AN EMERGENCY SITUATION.