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CYLINDER HEAD EM-109 < SERVICE INFORMATION > [VQ35DE] C D E F G H I J K L M A EM N P O 4. Heat cylinder head to 110 to 130 ° C (230 to 266 ° F) by soaking in heated oil. 5. Using the valve guide drift (commercial service tool), press valve WARNING: Cylinder head contains heat. When working, wear protec- 6. Using the valve guide reamer (commercial service tool), apply VALVE SEAT CONTACT • After confirming that the dimensions of valve guides and valves are within the specifications, perform this procedure. • Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve contact on the surface. • Check if the contact area band is continuous all around the circum- ference. • If not, grind to adjust valve fitting and check again. If the contacting surface still has “NG” conditions even after the re-check, replace 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. SEM008A Projection “L” Intake and exhaust : 12.6 - 12.8 mm (0.496 - 0.504 in) SEM950E Standard: Intake and exhaust : 6.000 - 6.018 mm (0.2362 - 0.2369 in) SEM932C SBIA0322E |