Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
51
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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