What was found
AIRCRAFT WRITTEN UP BY PIC FOR LARGE OIL LEAK, NR 2 ENGINE. INSPECTION REVEALED NR 3 CYLINDER (P/N LW-12966) HAD A GASKET (P/N 66732) INSTALLED INCORRECTLY UNDER ROCKER SHAFT COVER (P/N 72710). COVER IS SECURED WITH 2 SCREWS (P/N 72709). THIS ENGINE WAS RECEIVED FROM LYCOMING AS A FACTORY REMANUFACTURED UNIT AND ACCUMULATED ONLY 44.7 HRS TIS UNTIL LEAK WAS DISCOVERED. AFFECTED PARTS WERE INSTALLED BY MANUFACTURER AND NOT DISTURBED BY COMPANY PERSONNEL UNTIL DEFECT WAS DISCOVERED.