What was found
OIL LEAK WAS DISCOVERED AT MAGNETO MOUNTING FLANGE GASKET. UPON REMOVAL OF UPPER AND LOWER MAGNETO MOUNT CLAMPS (P/N 66M19385), WEAR AND FRETTING OF THE MAGNETO MOUNTING FLANGE WAS DISCOVERED. WHEN CHECKED, THE MAGNETO WAS STILL CORRECTLY TIMED TO THE ENGINE AND NO EXPLANATION CAN BE OFFERED AS TO WHY THE MAGNETO DID NOT PARTIALLY ROTATE AND AFFECT IGNITION TIMING. IN ADDITION, THE NUT AND LOCKWASHER WAS STILL HOLDING THE CLAMP TIGHT TO THE ENGINE. THE SUBMITTER HAS NEVER SEEN A SIMILAR PROBLEM ON MAGNETOS ATTACHED WITH OLDER STYLE (P/N 75965) MOUNT CLAMPS.