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EM-68 [QG] CYLINDER HEAD 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 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 CAUTION: ● Avoid directly to touching cold valve seats. ● Cylinder head contains heat. When working, wear protec- 5. Using valve seat cutter set (commercial service tool) or valve CAUTION: When using valve seat cutter, firmly grip the cutter handle Oversize [0.5 mm (0.020 in)]: Intake: 31.5 mm (1.240 in) Exhaust: 26.5 mm (1.043 in) SEM795A SEM008A PBIC0579E SEM934C |