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EM-208 < ON-VEHICLE REPAIR > [VQ40DE] CYLINDER HEAD 2. Ream cylinder head recess diameter for service valve seat. • Be sure to ream in circles concentric to valve guide center. This will enable valve 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. Finish seat to the specified dimensions using suitable tool. Refer . CAUTION: When using valve seat cutter, firmly grip cutter handle with 6. Using compound, grind to adjust valve fitting. 7. Check again for normal contact. VALVE SPRING SQUARENESS • Set try square along the side of valve spring and rotate spring. Measure the maximum clearance between the top face of spring • If it exceeds the limit, replace valve spring. VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD Oversize [0.5 mm (0.020 in)] Intake : 38.500 - 38.516 mm (1.5157 - 1.5164 in) Exhaust : 32.700 - 32.716 mm (1.2874 - 1.2880 in) SEM795A SEM008A SEM934C Limit : 2.1 mm (0.083 in) PBIC0080E |