Valve Clearance Adjustment
- Engine must be cold for correct valve clearance adjustment. Remove valve covers. Turn engine until intake valve of No. 5 cylinder just starts to move into open position. Adjust both valves for No. 1 cylinder (See Fig 1 ).
- Intake valve clearance is correct when .014" (.36 mm) feeler gauge is snug or drags lightly while .015" (.38 mm) gauge is very tight. Exhaust valve clearance is correct when .016" (.41 mm) feeler gauge is snug or drags lightly while .017" (.43 mm) gauge is very tight, refer to VALVE CLEARANCE ADJUSTMENT table. See Fig 1 .
- To adjust valves in cylinder firing order (1-4-2-5-3-6), rotate engine so that intake valve is just opening on cylinders in order 5-3-6-1-4-2. Adjusting screws are self-locking type. Turn screw clockwise to reduce clearance or counterclockwise to increase clearance. (See Fig 1 ).
- Use (1) feeler of each size to adjust clearances rather than stepped "go/no-go" gauge. When checking clearances, feeler gauge must enter gap from leading or trailing side of rocker arm pad. Gauge must be moved to opposite side of pad in motion parallel to centerline of crankshaft.CAUTION: DO NOT use a step-type "go/no-go" feeler gauge. Measuring valve clearance in direction perpendicular to crankshaft will result in poor feel. Valves measured in this incorrect manner will be adjusted too tightly. Damage to valves or valve seats will result.
- Install valve covers (be sure to use new valve cover gaskets and reinstall cover reinforcement plates). Start engine and check for oil and vacuum leaks.
VALVE CLEARANCE ADJUSTMENT
| Application | In. (mm) |
|---|---|
| Intake | .014 (.36) |
| Exhaust | .016 (.41) |