C 2500 Truck 2WD V8-5.7L VIN R (1997)
4. Adjust the valve rocker arm nuts until all of the lash is gone.
a. Turn the crankshaft until the cast arrow on the crankshaft balancer hub is at 12 o'clock and the number 1 cylinder is in the firing position (top
dead center).
b. Watch the number 1 cylinder valves as the crankshaft balancer hub approaches 12 o'clock. If a valve moves as the arrow moves into position,
the engine is in the number 6 firing position. If this happens, turn the crankshaft one more revolution in order to reach the number 1 cylinder
firing position.
c. With the engine in the number 1 firing position, adjust the exhaust valves 1,3,4,8 and the intake valves 1,2,5,7.
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Back off the valve rocker arm nut until the lash is felt in the valve pushrod.
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Tighten the valve rocker arm nut until all the lash is removed.
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Zero lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more movement.
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When all free play is gone, tighten the valve rocker arm nut 1 additional turn (360 degrees).
d. Turn the crankshaft 1 revolution until the hub arrow is at 12 o'clock. This is the number 6 firing position.
e. Adjust the exhaust valves 2,5,6,7 and the intake valves 3,4,6,8.
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Back off the valve rocker arm nut until the lash is felt in the valve pushrod.
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Tighten the valve rocker arm nut until all the lash is removed.
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Zero lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more movement.
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When all free play is gone, tighten the valve rocker arm nut 1 additional turn (360 degrees).
