What was found
CYLINDERS REMOVED FROM THE ENGINE DUE TO INCREASED OIL CONSUMPTION REPORTS. UPON REMOVAL, AN EXCESSIVE AMOUNT OF ROCKER ARM TO VALVE CLEARANCE WAS NOTICED ON THE NR 1, NR 2, AND NR 6 CYLINDERS. CLOSER EXAMINATION REVEALED TIPS OF THE EXHAUST VALVES HAD EXTREME WEAR. WHEN COMPARED TO A NEW VALVE, WEAR AS MUCH AS .081 INCH ON ONE OF THE TIPS AND APPROXIMATELY .090 INCH AND .095 INCH ON THE OTHER TWO VALVES. CONSTRUCTION OF THE VALVES INVOLVES A PROCESS WHERE A HARDENED TIP IS FRICTION WELDED TO THE VALVE STEM. SUBMITTER BELIEVES THE HARDENED TIP SEPARATED FROM THE VALVE STEM DURING SERVICE.