Engine JAC HFC4DA1-2C. Service manual — part 4
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
15
No. Name Standard
Size
(mm)
Fitting
nature
Assembly
Clearance for
New Engine
(mm)
Wear Limit
(mm)
Grouping of cylinder sleeve
inside diameter (after
pressed-in)
Group A
93.021~93.032
Group B
93.032~93.043
Group C
93.043~93.054
Group D
93.054~93.065
24
Opening of piston ring
1
st
compression ring
0.2~0.4
1.5
2
nd
compression ring
0.65~0.85
1.5
Oil control ring
0.25~0.50
1.5
25
End clearance of piston ring
1
st
compression ring
0.078~0.139
0.15
2
nd
compression ring
0.045~0.09
0.15
Oil control ring
0.03~0.07
0.15
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
16
Section VII Specification of Main Attachments and Accessories
Lubrication
system
Engine oil pump type
Externally engaged gear pump
Flow rate of engine oil pump
≥ 23L/m (at 1,000r/m and 0.4MPa)
≥ 23L/m (at 1,800r/m and 0.44MPa)
Open pressure of engine oil pump
relief valve
0.7±0.08MPa
Engine oil filter type
Filter element type
Cooling
system
Water pump type
Centrifugal type
Flow rate and head of water pump
(water temperature at 80±5ºC)
Head ≥6.5m (at 3,000r/m) at 100L/min flow rate;
Head ≥12m (at 4,000r/m) at 120L/min flow rate;
Thermostat type
Pellet thermostat
Temperature of thermostat
Initial open: 82ºC; full open: 95ºC
Fan type
Independent electric fan
Electric
system
Preheating plug type
Ceramic type
Voltage of preheating plug
12V
Starter specification
12V,2.8kW
Alternator specification
14V,90A
Battery voltage
12V
Intake system
Turbocharger
Radial flow variable section turbocharger
The top speed of turbocharger is ≤220,000r/m, with
turbocharger ratio at ≤2.2.
EGR
Type of EGR valve
Position feedback type
Voltage of EGR valve position
sensor
5V
Electronically
controlled
common rail
fuel system
Fuel
filter
type
Spin-on type, with fuel-water separator, manual fuel
delivery pump, and diesel heater
High pressure fuel pump
BOSCH CP1H, radial three-plunger pump, with fuel
delivery fuel pump and solenoid valve control
Fuel injector
BOSCH CRI2.2, solenoid valve control
High pressure common rail
Maximum rail pressure: 160MPa
Electronic control unit (ECU)
BOSCH EDC17, with working voltage at 12V
Crankshaft speed sensor
Working clearance: 0.5~1.2mm
Camshaft position sensor
Working clearance: 0.5~1.5
Air flowmeter
HFM6, with working voltage at 12V and flow measurement
range at 40~840kg/h.
Water temperature sensor
NTC type
Rail pressure sensor
Voltage output: 0.5~4.5V
Accelerator pedal position sensor
Voltage: 5V
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
17
Chapter II Maintenance for Main Structures of Engine
Section I Disassembly of Engine Assembly
I. Special Notices:
a) Before overhauling the engine, make sure to firstly disconnect the negative cable of the battery, or it will damage
the harness and other electric units;
b) Unless otherwise specified, rotate the ignition switch to LOCK position;
c) Whenever the air cleaner is disassembled, make sure to plug the intake port, in order to prevent the ingress of
foreign material, which may enter into cylinder and cause serious damage.
II. Disassembly Procedure
z Turn the ignition switch to LOCK position and disconnect the negative cable of the battery.
z Open the oil drainage bolt of the oil sump and fully drain and collect the oil.
z Fully drain the coolant.
z Disassemble the water inlet and outlet hoses of the engine.
z Disassemble the electronic control harness for engine ECU, engine, and complete vehicle.
z Disassemble the power supply wires for alternator, starter, and oil pressure and water temperature sensors.
z Remove the connecting hose between intake connecting pipe and air cleaner.
z Loosen the connecting pipe of inter-cooler.
z Shut off the fuel pipeline and unplug the fuel pipe and return pipe.
z Disconnect the power supply of the radiator fan and when necessary loosen the radiator bracket and take out the
whole radiator.
z Loosen the clutch connecting pipe.
z Disassemble relevant connecting pipes of air conditioner and power steering pump.
z Disconnect the exhaust manifold and exhaust muffler pipe.
z Loosen the connecting mechanism between transmission and the complete vehicle.
z Loosen the fixing bolts between engine and transmission suspension bracket.
z Steadily lower the engine with elevator.
z Loosen the connecting bolts between engine and transmission and separate the transmission from the engine.
Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
18
III. Illustration for Disassembly of Engine
1. Disassemble the flywheel.
a. Block the flywheel with flywheel clamp, loosen the
fixing bolts between damping pulley and flywheel, and
disassemble the flywheel assembly.
2. Disassemble the belt, air conditioner
compressor, and alternator and water
pump pulleys.
a.
Use an open-end wrench to remove the fixing nuts of
engine fan and remove the cooling fan of the engine.
b.
Loosen the alternator adjustment bolts and fixing bolts,
remove the fan clutch pulley and alternator belt, and
check the side face and toothed face of the belt for
normal state.
c.
Remove the oil and vacuum pump oil return pipe
connectors.
d.
Loosen the alternator fixing bolts and adjustment bolts
and disassemble the alternator belt. Check the
alternator belt for presence of aging, cracking, and
abnormal wear. If yes, replace the belt. Arrange the
parts disassembled orderly on the part shelf, remove
the alternator, use hand to rotate the alternator pulley,
and check the inside for presence of noise, stagnation,
and unbalance. Check the alternator for presence of
ablation and check the shaft for presence of abnormal
wear noise.
e.
Disassemble the water pump pulley.
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