What was found
NEW CRANKSHAFT GEAR P/N 653580 INSTALLED AT TIME OF ENGINE OVERHAUL IN CONJUNCTION WITH TCM SB CSB 94-4 IN KIT EQ6642. ENGINE FAILED APROXIMATELY 400.0 HOURS LATER. ENGINE DISASSEMBLY REVEALED THE POSSIBILITY THE GEAR BROKE FIRST CAUSING DAMAGE TO VALVE TRAIN, STARTER ADAPTER GEAR, AND IDLER GEAR.