Engine JAC HFC4DA1-2C. Service manual — part 13
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.
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
52
9. Install other peripheral accessories.
a. In turn install the fuel injection assembly with sealing
gasket onto the cylinder head.
b. Install the fuel injector fixing pressure plate and
install and tighten the fuel injector pressure plate
bolts to 8±2N.m+40~45°.
c. Install the 1
st
cylinder high pressure fuel pipe
assembly, 2
nd
cylinder high pressure fuel pipe
assembly, fuel injection pump high pressure fuel
pipe, 3
rd
cylinder high pressure fuel pipe assembly,
and 4
th
cylinder high pressure fuel pipe assembly and
tighten the corresponding nuts. Notice: 1. Notice the
installation direction of high pressure fuel pipes; 2.
The tightening torque for nuts at fuel injector end is
27±5N.m; 3. The tightening torque is 20±5N.m for
nuts at high pressure fuel rail end, 27±2N.m for high
pressure fuel pipe nuts at fuel pump end, and
20±2N.m for high pressure nuts at fuel rail end.
d. Use accelerator cable bracket bolts to install the fuel
return three-way valve onto the gear chamber and
tighten to 7.5±2.5N.m.
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
53
e. Install the engine oil filter and O-ring subassembly
and tighten the fixing bolts of engine oil filter bracket
to 25±5 N.m.
f. Install the engine right bracket and shock absorber
subassembly and install and pre-tighten the fixing
bolts.
g. Install the water inlet pipe gasket and water pump
inlet pipe weldment subassembly, pre-tighten the
bolt, spring, and plain washer subassembly (of water
pump inlet pipe), and install and tighten the bracket
fixing bolts at the lower end of water pump inlet pipe
weldment.
h. Install the engine left bracket and shock absorber
assembly and tighten the fixing bolts.
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
54
i. Check the cylinder head shield O-ring.
j. Install the cylinder head shield and install and tighten
the cylinder head shield bolts to 13±5N.m.
k. Install the exhaust manifold gasket and install the
exhaust manifold and turbocharger subassembly.
l. Install the spring washers and hexagon nuts and
tighten the fixing nuts and fixing bolts as per
specified sequence.
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