Valve Clearance: Adjustments
ADJUST VALVE CLEARANCENOTE: (If air cleaner is removed) Before starting the engine, plug the air suction (AS) hose to prevent leakage of exhaust gas and the HIC hose to prevent rough idling.
1. Warm up the engine to normal operating temperature.
2. Stop the engine and remove the valve cover.
3. Set No. 1 cylinder to TDC/compression.
^ Turn the crankshaft with a wrench to align the timing marks at TDC. Set the groove on the pulley to the 0 position.
^ Check that the rocker arms on No.1 cylinder are loose and rockers on No.4 are tight.
If not, turn the crankshaft one complete revolution and align marks as above.
4. Adjust the clearance of half of the valves.
^ Adjust only those valves indicated by arrows.
Valve clearance:
Intake 0.20 mm (0.008 in.)
Exhaust 0.30 mm (0.012 in.)
^ Use a feeler gauge to measure between the valve stem and rocker arm. Loosen the lock nut and turn the adjusting screw to set the proper clearance. Hold the adjusting screw in position and tighten the lock nut.
^ Recheck the clearance. The feeler gauge should move with a very slight drag.
5. Turn the crankshaft one complete revolution (360°) and align timing marks in the manner mentioned above.
Adjust only the valves indicated by arrows.
6. Reinstall the valve cover.
7. Reinstall the air cleaner.