As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE VIBRATED 5-10 SECONDS BEFORE SEIZING, NO OTHER INDICATIONS OF PENDING FAILURE WERE NOTED. AT ENGINE TEARDOWN, THE CRANKSHAFT WAS FOUND BROKEN AT THE FORWARD END OF THE NR 4 CONNECTING ROD JOURNAL. MAINTENANCE RECORDS ONLY WENT BACK TO LAST OVERHAUL AND NO RECORD OF PREVIOUS PROPELLER STRIKES OR SUDDEN ENGINE STOPPAGE COULD BE FOUND.