Engine JAC HFC4DA1-2C. Service manual — part 11
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
43
j. Install the idler gear shafts A and C onto the idler
gear lining plate and use nylon bar for idler gear shaft
to lightly knock into the idler gear lining plate.
k. Apply oil onto the surface of idler gear C bush and
lightly rotate into the idler gear shaft C. Then, apply
oil onto the surface of idler gear A bush and use
nylon bar to lightly knock into the idler gear shaft A.
Take caution to apply the force lightly and uniformly,
in order to prevent the abnormal wear of bush.
l. While installing the idler gear A, take caution to
adjust the installation position of idler gear A and "2
2” position of camshaft gear as per the “1 1” marking
of crankshaft gear. (Timing photo)
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
44
m. Apply oil onto the surface of idler gear B bush and
lightly rotate into the idler gear shaft B. In event of
difficult installation, slightly rotate the crankshaft to
help installation.
n.
Use the hexagon flange bolts to install the idler gear
pressure plates A, B, and C onto the idler gear shaft
and tighten the fixing bolts of pressure plate and
fixing bolts of idler gear lining plate to 25±5N. m
torque.
5. Install the oil sump.
a. Use a scraper to remove the excessive portion of the
gear chamber.
b. Install and pre-tighten the stud * 12 of oil sump.
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
45
c. Apply sealant to the lower end face of timing gear
chamber and the lower rear end of engine block.
d. Install the oil sump gasket.
e. Apply the sealant for the second time to both sides of
oil sump gasket.
f.
Install the oil sump assembly with oil drainage screw
plug and use nylon bar to lightly knock the oil sump
to ensure the steady installation of oil sump.
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
46
g. As per the specified sequence, tighten the fixing bolts
*10 of oil sump and the fixing nuts * 12 of oil sump
to 23.5±3.5N.m torque.
h. Use a cotton cloth to wipe away excessive sealant.
5. Install the timing gear chamber.
i. Pre-install the flange O-ring of fuel injection pump
onto the fuel injection pump.
j. Place the fuel injection pump into installation
position, install and pre-tighten the hexagon socket
fixing bolts of fuel injection pump, and install the
fuel injection pump gear and fixing nuts of fuel
injection pump.
k. Tighten large fixing nuts of fuel injection pump to
70±5 N·m and tighten hexagon socket fixing bolts of
fuel injection pump to 30±5 N·m.
l. Install the water pump O-ring onto the water pump
and use hand to rotate the impeller for two turns to
ensure that the water pump rotates flexibly.
m. Install the water pump assembly to the gear chamber.
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