Installing and Adjusting Push Rods

1. Before installing or adjusting push rods, remove and clean all hydraulic tappets. Make sure each tappet is clean and free from oil before installing it in the guide. See "Valve Tappets and Guides."

2. See Figure 3-7. Remove the spark plugs and turn the engine until the front piston is at the top of its compression stroke. With front piston in this position the advance timing mark (1) will align with the timing inspection hole.

RETARD MARK FRONT CYLINDER

ADVANCE MARK FRONT CYLINDER

RETARD MARK FRONT CYLINDER

Advance timing mark Retard position of piston top center mark on flywheel

Timing inspection hole

Figure 3-7. Timing Marks

3. Install front cylinder push rods and covers (6, 7 Figure 3-3). Always use new push rod cover gaskets or O-rings when re-assembling. Clean sealing surfaces with greaseless solvent. Greasy joint surfaces will make it difficult to remove gaskets or O-rings during next disassembly.

4. See Figure 3-7A. Turn one push rod adjusting screw (2) downward until the ball end of rod is seated in hydraulic lifter and has just no noticeable shake. Hold the push rod flats (3) with one wrench to keep rod from turning and with a second wrench turn the adjusting screw down slowly until all noticeable shake is taken up. Turn it downward until push rod bottoms then turn it up exactly VA turns. Lock the adjustment by turning locknut (1) against push rod and tightening the locknut to 10 ft-lbs torque. Repeat for the other front cylinder push rod.

5. See Figure 3-7. Now turn the engine over until the rear piston is at the top of its compression stroke. With the rear cylinder in this position the front cylinder retard mark (2) will align with the timing inspection hole.

6. Repeat the procedure for the with the rear cylinder push rods.

7. Re-install the spark plugs.

1. Locknut

2. Adjusting screw

3. Push rod

Figure 3-7A. Push Rod Adjustment

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