Valve Clearance: Adjustments

Fig. 11 Adjusting Valve Clearance:

1. With engine at operating temperature, remove rocker arm cover.
2. Disconnect high tension lead from ignition coil.
3. While observing rocker arms on No. 4 cylinder, rotate crankshaft clockwise until the exhaust valve is closing and the intake valve has just to open. Ensure timing mark on crankshaft pulley is aligned with ``T'' mark on lower timing cover case. At this position the No. 1 cylinder is at top dead center compression stroke. Check and adjust valve clearance for both intake and exhaust valves of No. 1 cylinder, intake valve of No. 2 cylinder and exhaust valve of No. 3 cylinder. If valve clearance is not as specified, adjust valves as follows:
a. Loosen rocker arm locknut.
b. Turn adjusting screw while measuring clearance with a feeler gauge, Fig. 11, until screw contacts feeler gauge.
c. Intake valve clearance should be .006 inch (.15mm) and exhaust valve clearance should be .010 inch (.25mm) with engine hot.
d. Hold adjusting screw in place and tighten locknut to specifications.
4. Rotate crankshaft clockwise 360 degrees then check and adjust valve clearance for exhaust valve of No. 2 cylinder, intake valve of No. 3 cylinder and intake and exhaust valves of No. 4 cylinder.
5. After completing adjustment, install rocker arm cover and connect ignition coil high tension lead.
6. Tighten rocker arm cover bolts to specifications.