Engine JAC HFC4DA1-2C. Manual - part 12

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

n. Install and tighten the bolts and nuts of water pump in

diagonal manner to 25±5N.m.

o. Install the timing gear chamber cover subassembly

and attach and tighten the fixing bolts of gear

chamber cover to 20±5 N.m.

p. Torque for hexagon socket fixing bolt: 60±10 N.m.

q. Install the damping pulley and attach and tighten the

fixing bolts of damping pulley to 210±15 N·m.

6. Install the cylinder head and related
accessories.

a. Check whether the upper surface of cylinder block is

normal and the cylinder gasket is normal and install

the cylinder gasket.

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

b. Install the cylinder head onto the cylinder block.

c. Immerse the thread portion of cylinder head bolts into

oil and then install into the cylinder head and

pre-tighten.

d. Tighten the cylinder head bolts by steps from the

center to two sides as per the specified sequence:

65N.m→85N.m→105N.m

e. Install the thermostat housing and water outlet

assembly and tighten the fixing bolts and hexagon

socket fixing bolts.

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

7. Install the intake manifold and
related accessories.

a. Use hexagon flange bolts to fix the fuel rail bracket

onto the cylinder block and tighten to 37.5±9.5N.m.

b. Use hexagon flange bolts to install the fuel rail

assembly with rail pressure sensor onto the fuel rail

bracket and tighten to 25±5N.m.

c. Install the intake manifold gasket.

d. Insert the oil dipstick into the cylinder block and

tighten the fixing bolts and nuts of intake manifold as

per the specified sequence.

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

e. Install the intake manifold and install and tighten the

fixing bolts, plain washers, and fixing nuts.

f. Install the intake manifold harness bracket and intake

pressure and temperature sensor.

8. Install the push rod rocker arm
subassembly and adjust the valve
clearance.

a. Dip the tip of push rod with oil and install into the

cylinder head. Install the rocker arm and pre-tighten

the rocker arm support bolts.

b. Tighten the support bolts by steps. Sequence: 2-3-4-1;

Torque: 55±5N.m