As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ENGINE START, AFTER SEVERAL ROTATIONS, PROP STOPPED AND WOULD NOT TURN. MECHANIC FOUND CRANKSHAFT LARGE GEAR ATTACH BOLTS SHEARED AND GEAR DISLODGED FROM CRANKSHAFT. MECHANIC REMOVED AND REPLACED ENGINE AND RETURNED AIRCRAFT TO SERVICE. (NE01200502601) (K)