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Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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c. Rotate the crankshaft, till the top dead center (TDC) line of crankshaft damping pulley is aligned with the timing pointer. In such case, either 1 st cylinder piston or 4 th cylinder piston is at top dead center (TDC) of compression stroke.
d. Check the clearance of push rod for the intake valve and exhaust valve of 1 st cylinder. If there is a clearance between 1 st cylinder intake valve and valve push rod, the 1 st cylinder piston is at top dead center of compression stroke (1236). If the 1 st cylinder intake valve is pressed tightly by exhaust valve push rod, the 4 th cylinder piston is at top dead center of compression stroke (4578).
e. Valve clearance (under cold state): 0.3-0.4 mm f. Loosen the clearance adjustment screws for the valves, as shown in the figure. g. Insert the feeler gauge with appropriate thickness between rocker arm and valve rod end.
h. Rotate the valve clearance adjustment screw, till a light resistance is felt on the feeler gauge. i. Securely tighten the lock nut.
j. Rotate the crankshaft for 360º. k. Align the TDC marking of crankshaft damping pulley with the timing pointer. l. Adjust the clearance for other valves, as shown in the figure.
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