As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TEAR DOWN INSPECTION OF ENGINE AFTER PROP STRIKE, THICK OIL SLUDGE DEPOSITS WERE FOUND IN THE CRANKSHAFT AND THE OIL PAN. TWO ACCESSORY HOUSING GEARS HAD TO BE REPLACED DUE TO PITTING AND WEAR. RECORDS SHOW THE ENGINE HAD BEEN RUN USING MOBILE AV-1 OIL FROM 05-02-88 THROUGH 03-25-93 FOR A TOTAL OF 592.6 HOURS. THE SOLID FILM IN THE CRANKSHAFT AND OIL PAN MEASURED .1250 INCH THICK.