What was found
OWNER COMPLAINED OF PROPELLER VIBRATIONS. THE PROPELLER WAS REMOVED AND SENT TO OUR FACILITY FOR TRACK AND BALANCE CHECK. FOUND BLADE ANGLE SPREAD .4 DEGREES. REMOVED CYLINDER TO INVESTIGATE AND FOUND OIL QUANTITY VERY LOW. REMOVED OIL AND FOUND PROPELLER ACTUATING PIN HOLES IMPROPERLY DRILLED. PISTON NOT MODIFIED PER SERVICE LETTER. EXPANSION LOCK PLUGS DRILLED INCORRECTLY AND TWO RETENSION NUTS UNSERVICEABLE. THIS PROPELLER WAS RECENTLY OVERHAULED ACCORDING TO CUSTOMER.