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CYLINDER HEAD EM-73 C D E F G H I J K L M A EM 6. Using the valve guide reamer (commercial service tool), apply VALVE SEAT CONTACT ● After confirming that the dimensions of valve guides and valves ● Apply prussian blue (or white lead) onto contacting surface of ● Check if the contact area band is continuous all around the cir- ● If not, grind to adjust valve fitting and check again. If the contact- VALVE SEAT REPLACEMENT When valve seat is removed, replace with oversized (0.5 mm, 0.020 in) valve seat. 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. CAUTION: ● Avoid directly touching cold valve seats. ● Cylinder head contains heat, when working, wear protective equipment to avoid getting burned. Standard Intake and exhaust : 6.000 - 6.018 mm(0.2362- 0.2369in) SEM932C SBIA0322E 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 |