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CYLINDER HEAD EM-77 C D E F G H I J K L M A EM ● If not, grind to adjust valve fitting and check again. If the contacting surface still has NG conditions even EM-77, "VALVE SEAT REPLACEMENT" VALVE SEAT REPLACEMENT When valve seat is removed, replace with oversized (0.5 mm, 0.020 in) valve seat. 1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess CAUTION: Prevent to scratch cylinder head by excessive boring. 2. Ream cylinder head recess diameter for service valve seat. ● Be sure to ream in circles concentric to the valve guide center. ● This will enable valve seat to fit correctly. 3. Heat cylinder head to 110 to 130 ° C (230 to 266 ° F) by soaking in heated oil. 4. Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head. WARNING: Cylinder head contains heat, when working wear protective equipment to avoid getting burned. CAUTION: Avoid directly touching cold valve seats. 5. Using the valve seat cutter set (commercial service tool) and CAUTION: When using the valve seat cutter, firmly grip the cutter han- 6. Using compound, grind to adjust valve fitting. 7. Check again for normal contact. Refer to Oversize [0.5 mm (0.020 in)] Intake : 37.500 - 37.516 mm (1.4764 - 1.4770 in) Exhaust : 32.700 - 32.716 mm (1.2874 - 1.2880 in) SEM795A SEM008A SEM934C |