What was found
ENGINE DISASSEMBLY REVEALED THE CRANKSHAFT HAD FAILED THROUGH THE NR 3 CRANK CHEEK. THE FRACTURE FACE WAS EXAMINED BY THE TCM METALLURGIST WHO CONFORMED THE FAILURE WAS IN BENDING OVERLAOD. THE NR 1 AND NR 2 MAIN BEARINGS WERE HAMMERED OUT TO EXTRUDE THE BEARINGS. THE CRANKCASE PARTING SURFACE WAS SEVERELY FRETTED AT THE NR 2 MAIN BEARING SUPPORT. FRETTING WAS ALSO PRESENT, BUT TO A LESSER DEGREE, ON THE NR 1 AND NR 3 MAIN BEARING SUPPORTS. BEARING AND ALUMINUM DEBRIS WAS PRESENT IN THE OIL SUMP.