Valve Clearance: Adjustments

1. Remove valve cover and turn engine to firing position for No. 1 cylinder. Flywheel timing mark should be at 0 and No. 1 cylinder cam lobes should point up at equal angles.

Fig. 3 Checking valve clearance:

2. Check valve clearance by placing feeler gauge between cam and tappet, Fig. 3. Refer to ``Valve Specifications.''
3. If clearances are not within specifications, turn engine approximately 1/4 turn to allow adequate clearance for depressing valves.

Fig. 4 Aligning valve tappets:

Fig. 5 Depressing valve tappets:

4. Turn valve tappets until notches point slightly inward, Fig. 4. Use tool 5196 or equivalent to depress valve tappets, Fig. 5. Tappet grooves must point so that disc can be gripped with pliers 5195 or equivalent.
5. Remove disc and use micrometer to measure disc thickness. Determine disc thickness necessary to obtain correct clearance. Discs are available in thicknesses of 0.1299 inch (3.30 mm) to 0.1673 inch (4.25 mm) in increments of 0.002 inch (0.05 mm). Use only new discs.
6. Oil disc and position with numbers facing down.
7. Check remaining cylinders in 1-5-3-6-2-4 sequence. Always check valve clearance with cylinder at TDC. Always turn engine 1/4 turn after TDC to set valve clearance.
8. Rotate engine several turns and check clearances. Adjust if necessary. Install valve cover using new gasket if necessary.