What was found
(CAN) ENGINE ORIGINALLY OVERHAULED IN 2002, FIRST RUN. AT THAT TIME, A PROCESS TO CLEAN OIL JET NOZZLE 3 AND 4 WAS UTILIZED AS PER OEM MANUAL. OTHER OPERATORS HAD EXPERIENCED DIFFICULTY WITH THE 3/4 OIL NOZZLE AND IT WAS FOUND THAT PROPER AND THOROUGH CLEANING OF THE NOZZLE WAS NOT ASSURED AT THE OVERHAUL LEVEL. IT WOULD APPEAR THAT THE 3/4 NOZZLE PLUGGED UP AND STARVED THE NR 3 BEARING TO THE POINT OF FAILURE. OVERHAULS WHERE MANDATED WITH A MANDATORY REPLACEMENT OF THE 3/4 NOZZLE FOR ALL OUR ENGINES. HAVE SEVERAL THAT AS A PRECAUTION, GOING BACK IN, TO SIMPLY REPLACE 3/4 NOZZLE AS A RESULT OF FAILURE. THIS IS THE 1ST FAILURE. FLEET EXPERIENCED FAILURES IN THE NR 2 BEARING CAVITY.