What was found
TRANSIT ACFT LANDED EN ROUTE WITH LT ENGINE SHUT DOWN DUE IN-FLIGHT OIL LEAK. CLEANED ENG AND DID A SHORT RUN AND FOUND OIL COMING FROM PROP SHAFT AREA. REMOVED PROP AND CHECKED O-RING AND IT CHECKED OK. UPON FURTHER INVEST, APPEARED TO BE A CRACK BEHIND PROP FLANGE OF CRANKSHAFT. A SMALL CHIP WAS FOUND INSIDE CRANKSHAFT WITH POSSIBLE CRACK. DYE CHECK ON OUTSIDE INDICATED CRACK APPROX ONE-FOURTH OF THE WAY AROUND. PAINT CLEANED OFF AND SECOND DYE CHK INDICATED CRACK. ENG 27.7 HRS OUT OF REPAIR FOR PROP STRIKE AND CRANKSHAFT INSPECTED AT THAT TIME PER LOG ENTRY. ENG O/H 4-2-93, 864.2 HRS.