|
|
CYLINDER HEAD EM-95 < REMOVAL AND INSTALLATION > C D E F G H I J K L M A EM N P O Check along six positions as shown. If it exceeds the limit, replace the cylinder head. The limit for cylinder head resurfacing is determined by the cyl- inder block resurfacing. After resurfacing cylinder head, check that camshaft rotates freely by hand. If resistance is felt, cylinder head must be replaced. VALVE GUIDE CLEARANCE 1. Measure valve deflection as shown. (Valve and valve guide mostly wear in this direction.) 2. If it exceeds the limit, check valve to valve guide clearance. b. Check that clearance is within specification. (Valve guide clearance) = (Valve guide inner diameter) - (Valve stem diameter) c. If it exceeds the limit, replace valve or valve guide. VALVE GUIDE REPLACEMENT When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide. Head surface distortion : 0.1 mm (0.004 in) Standard : Less than 0.03 mm Resurfacing Limit : A + B = 0.2 mm (0.008 in) Nominal cylinder head height : 126.3 - 126.5 mm (4.972 - 4.980 in) SEM861E Valve deflection limit (dial gauge reading) : 0.24 mm (0.0094 in) Exhaust : 0.28 mm (0.0110 in) SEM178F Valve to valve guide clearance standard : 0.020 - 0.053 mm (0.0008 - 0.0021 in) Exhaust : 0.040 - 0.073 mm (0.0016 - 0.0029 in) Valve to valve guide clearance limit : 0.08 mm (0.0031 in) Exhaust : 0.1 mm (0.004 in) SEM938C |