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ENGINE 30 OVERHAUL Valves and guides - inspection NOTE: Two types of exhaust valve may be Carbon break valves may be identified by the 1. Remove carbon deposits from exhaust valve guides using tool LRT-12-149. CAUTION: Tool must be inserted into 2. Remove carbon from inlet valve guides, inlet and exhaust valves and valve seat inserts. NOTE: Carbon break exhaust valve 3. Check and record existing valve stem diameters A , replace any valve with stem 4. Check inlet and exhaust valve guide clearances C using the following procedures: 5. Insert valve into its respective guide. and position a DTI gauge to rear of valve head. 7. Move valve towards front of cylinder head, pre-load gauge to valve head then zero gauge. 8. Move valve towards rear of cylinder head, record gauge reading obtained to give valve 9. Repeat above procedures for remaining valves. Valve stem diameter A: Inlet = 5.952 to 5.967 mm Valve guides: Inside diameter B:= 6.000 to 6.025 mm Valve stem to guide clearance C: Inlet = 0.033 to 0.063 mm 10. Renew valves and guides as necessary. |