Engine JAC HFC4DA1-2C. 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.