To verify the correctness of the camshaft timing, proceed as follows:
Adjust the tappet clearance on the exhaust and intake valve on No. 1 cylinder (see chart).
Turn the crankshaft in the direction of normal rotation until No.1 piston is started up on the exhaust stroke.
Hold the No. 1 intake tappet on an "L" head engine or the push rod on an overhead engine, turn it and continue to turn the crankshaft slowly. The instant the tappet or push rod tightens up, stop turning the crank and check the markings on the fly-wheel against the chart. On the HD260, for example, the indicator should point to 6 degrees before top dead center.
The exhaust valve is still open so transfer to the No.1 exhaust tappet or push rod, trying to turn it as the crank is turned. Stop turning the crank immediately when the tappet or push rod breaks free, indicating that the valve is closed. On the HD260 this should be 20 degrees after top dead center.
When making these checks some variation will exist due to manufacturing tolerances as well as variations in setting the tappet clearance and in determining when the valves open or close. Five degrees either way from the specifications is an indication that the camshaft timing is correct, twelve degrees early or late indicates that the timing is one tooth off.
Tappet Clearance for Valve Timing
Prior to 2478
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