What was found
PROPELLER HAD AN INTERNAL LEAK AFTER 250 HRS OPERATION SINCE LAST OVERHAUL. THE ROD HAD BEEN RUBBING ON THE BUSHING IN THE BACK OF THE HUB WHICH IS A REPAIR FROM ORIGINAL MANUFACTURER OF ALL ALUMINUM HUBS. THE BUSHING INSTALLED FOR REPAIR IS MADE OF STEEL. MAXIMUM REPAIR DIMENSION FOR HUB OR REPLACEMENT OF BUSHING IS .754 INCH. THE BUSHING MEASURED .762 INCH AND THE ROD HAD WORN TO MINIMUM DIMENSION OF .748 INCH. THIS CAUSED LARGE TOLERANCE AND ALLOWED OIL INTO THE CAVITY OF HUB. ROD WAS REPLACED AND BUSHING WAS REPLACED WITH NEW AND RETURNED TO SERVICE.