Valve Clearance: Adjustments

Fig. 5 Rocker Arm:

Fig. 6 Valve Clearance Adjustment:

To eliminate the need of adjusting valve lash, a positive stop fulcrum bolt and seat is used, Fig. 5.
It is very important that the correct pushrod be used and all components be installed and torqued as follows:
1. Position piston of cylinder being worked on at TDC of its compression stroke.
2. Install rocker arm, fulcrum seat and oil deflector. Install fulcrum bolt and torque to specification.
A .060 inch shorter pushrod or a .060 inch longer rod are available for service to provide a means of compensating for dimensional changes in valve mechanism. Valve stem-to-rocker arm clearance should be .096-.146 inch, with hydraulic lifter completely collapsed, Fig. 6. Repeated valve grind jobs will decrease this clearance to the point that if not compensated for the lifters will cease to function.
When checking valve clearance, if clearance is less than the minimum, the .060 inch shorter pushrod should be used. If clearance is more than maximum, the .060 inch longer pushrod should be used. To check valve clearance, proceed as follows:

1. With No. 1 piston at TDC at end of compression stroke, check following valves:
a. Intake Nos. 1, 4 and 8; exhaust Nos. 1, 3 and 7.
2. Rotate crankshaft 360°. Check following valves:
a. Intake Nos. 3 and 7; exhaust Nos. 2 and 6.
3. Rotate crankshaft 90°. Check following valves:
a. Intake Nos. 2, 5 and 6; exhaust Nos. 4, 5 and 8.
4. If clearance is less than specified, install a shorter push rod.
5. If clearance is greater than specified, install a longer push rod.