What was found
WHILE IN CRUISE FLIGHT THE PILOT NOTICED OIL STREAMING FROM THE TOP OF THE LT ENGINE COWL. THE OIL PRESSURE WAS STILL IN THE NORMAL OPERATING RANGE AND THE ENGINE APPEARED TO BE OPERATING NORMALLY. AS A PRECAUTION, THE LT ENGINE WAS SHUTDOWN AND SECURED. THE PILOT DEVIATED TO THE NEAREST AIRPORT WHERE HE MADE AN UNEVENTFUL LANDING. UPON INVESTIGATION BY MAINTENANCE, IT WAS DISCOVERED THAT THE WET SYSTEM VACUUM PUMP DRIVE HAD SHEARED AND CAUSED THE GARLOCK SEAL TO DISINTEGRATE, ALLOWING OIL TO SEEP PAST.