What was found
EXHAUST VALVE STICKING AND MATERIAL TRANSFER DUE TO MATERIAL INCOMPATIBILITY. EXHAUST VALVE (P/N SA643873), STEM IS CHROME PLATED AND VALVE GUIDE (P/N SA631496), IS ALUMINUM BRONZE AND THE 2 MATERIALS ARE NOT COMPATIBLE. NI-RESIST VALVE GUIDE (P/N 643767) SHOULD BE USED IAW TCM SB M85-18. ALL CYLINDERS REPAIRED BY USING (P/N 652956) EXHAUST VALVE AND (P/N 643767) EXHAUST GUIDE.