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SEM178F VALVE GUIDE CLEARANCE NHEM0019S08 1. Measure valve deflection as shown in the figure. (Valve and Valve deflection limit (Dial gauge reading): Intake 0.24 mm (0.0094 in) SEM938C 2. If it exceeds the limit, check valve to valve guide clearance. a. Measure valve stem diameter and valve guide inner diameter. b. Check that clearance is within specification. Valve to valve guide clearance limit: Intake 0.08 mm (0.0031 in) c. If it exceeds the limit, replace valve or valve guide. SEM008A VALVE GUIDE REPLACEMENT NHEM0019S09 1. To remove valve guide, heat cylinder head to 110 to 130°C SEM931C 2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 SEM932C 3. Ream cylinder head valve guide hole. Valve guide hole diameter (for service parts): 10.185 - 10.196 mm (0.4010 - 0.4014 in) GI MA LC EC FE AT AX SU BR ST RS BT HA SC EL IDX CYLINDER HEAD Inspection (Cont’d) EM-43 |