What was found
THIRTY MINUTES INTO LOCAL FLIGHT, ENGINE FAILED. PILOT MADE A FORCED LANDING IN A PLOWED FARM FIELD. NO VISIBLE DAMAGE INCURRED TO AIRPLANE. ON TEARDOWN, DEEP SCORING WAS FOUND IN THE OIL PUMP GEAR HOUSING. ALUMINUM AND PISTON RING PIECES WERE FOUND IN THE SUMP. A 2 INCH CRACK WAS FOUND IN CASE HALF. NR 4 PISTON DISINTEGRATED FROM CYLINDER. THREE LIFTERS HAD MISSING PIECES. THE CAMSHAFT HAD IMPACT DAMAGE ON ALL LOBES. ALL RODS HAVE IMPACT DAMAGE. NR 4 CYLINDER IS UNSERVICEABLE.