JAC S2. Engine. Instruction — part 7

Engine lubricating system

Engine intake system 75

2. Install the oil sump assy

3. Fill in engine oil

4. Install the front left cover of engine

5. Install the front right cover of engine

6. Connect the cathode wires of battery

7. Close the engine hood

IX. Engine oil dipstick tube components

(I) Disassembly

1. Open the engine hood

2. Disconnect the cathode wires of battery

3. Dismantle the dipstick tube components

1). Pull out the dipstick

Engine lubricating system

Engine intake system 76

2). Screw off the fixed bolts

3). Take down the dipstick tube components

(II) Installation

1. Install the dipstick tube components

1). Install the fixed bolts

Tightening torque 8.4±0.6 N•m

Engine lubricating system

Engine intake system 77

2). Insert the dipstick

2. Connect the cathode wires of battery

3. Close the engine hood

X. Oil pump assy

(I) Disassembly

1. Open the engine hood

2. Disconnect the cathode wires of battery

3. Release the pressure of fuel system

4. Dismantle the front left cover of engine

5. Dismantle the front right cover of engine

6. Drain out the clutch oil

7. Drain out the transmission oil

8. Drain out the engine oil

9. Drain out the coolant

10. Recycle the refrigerant and refrigerant oil.

11. Dismantle the air intake manifold

Engine lubricating system

Engine intake system 78

12. Dismantle the tubes and expansion valve assy

13. Dismantle the water inlet and outlet tube assy

14. Dismantle the air filter

15. Dismantle the battery

16. Dismantle the battery tray

17. Dismantle the reversing light switch

18. Dismantle the clutch working cylinder

19. Dismantle the starter

20. Dismantle the front left wheel

21. Dismantle the front right wheel

22. Dismantle the left driving axle assy

23. Dismantle the right driving axle assy

24. Dismantle the transmission assy

25. Dismantle the engine assy

26. Dismantle the belt of generator

27. Dismantle the generator

28. Dismantle the compressor assy

29. Dismantle the idler assy

30. Dismantle the belt pulley of water pump

31. Dismantle the water pump

32. Dismantle the belt pulley of crankshaft

33. Dismantle the dipstick components

34. Dismantle the oil sump assy

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35. Dismantle the suction filter

36. Dismantle the cylinder head cover components

37. Dismantle the front oil seal of crankshaft

38. Dismantle the sprocket housing cover.

1). Screw off the 15 fixed bolts and take down the sprocket housing cover.

39. Dismantle the oil pump assy

1). Screw off the 3 fixed bolts.

2). Screw off the 4 fixed nuts

3). Take down the oil pump assy

(II) Installation

1. Install the oil pump assy

1). Align the oil pump assy with the mounting holes and screw into the bolts and nuts

2). Tighten the fixed bolts

Engine lubricating system

Engine intake system 80

3). Tighten the fixed nuts

2. Install the sprocket housing cover

1). Clean the surface free from engine oil and dirt and smear the sealing glue of KANGNING 3-0115

according to the instruction of the below diagram.

The strip diameter is 2mm±0.5mm at place A and the strip diameter is 1.5mm±0.5mm at place B.

2). Align the sprocket housing cover with mounting holes and tighten the bolts according to the below

Engine lubricating system

Engine intake system 81

diagram.

Tightening torque Big bolt (39.5±3.0) N•m

Tightening torque Small bolt (8.4±0.6) N•m

3. Install the front oil seal of crankshaft

4. Install the cylinder head cover components

5. Install the suction filter

6. Install the oil sump assy

7. Install the dipstick tube components

8. Install the belt pulley of crankshaft

9. Install the water pump

10. Install the belt pulley of water pump

11. Install the idler

12. Install the compressor assy

13. Install the generator

14. Install the belt of generator

15. Install the engine assy

16. Install the transmission assy

17. Install the right driving axle assy

Engine lubricating system

Engine intake system 82

18. Install the left driving axle assy

19. Install the front right wheel

20. Install the front left wheel

21. Install the starter

22. Install the working cylinder of clutch

23. Install the reversing light switch

24. Install the battery tray

25. Install the battery

26. Install the air filter assy

27. Install the water inlet and outlet tube of warmer

28. Install the tubes and expansion valve assy

29. Install the air inlet tube

30. Fill in refrigerant and refrigerant oil

31. Fill in coolant

32. Fill in engine oil

33. Fill in the lubricant oil of transmission

34. Fill in the clutch oil

35. Install the front right cover of engine

36. Install the front left cover of engine

37. Connect the cathode wires of battery

38. Close the engine hood

Engine cooling system

Engine intake system 83

Engine cooling system

I

、Summary

(I)structure overview

System description

Intake system is composed of water pump, thermostat components, water temperature sensor, water pipe, radiator, cooling
fan assembly, expansion tank assembly (with overflow pipe), etc.

1

、Radiator: it is the cooling component of cooling system, release

the heat of cooling liquid into air.

2

、Cooling fan introduction: cooling fan assembly can

improve the air volume going through the radiator,

increase radiating efficiency.

3

、expansion tank

The main function of expansion tank assembly (with overflow pipe) is to provide expansion space for cooling liquid,

release the air in the cooling liquid and the vapor caused from heated engine timely, so the radiation function can be used

efficiently to improve cooling efficiency.

(II)system principle

Cooling system description

Small recycle

When thermal load of engine is small, water pump, as power source, pushes cooling liquid flow through cylinder, cylinder

cover, and finally go back to water pump, which forms small recycle.

Big recycle

When thermal load of engine is big, thermostat opens, water pump sucks cooling liquid into engine and compress, flow

through cylinder, cylinder cover, thermostat, water pipe and then into radiator, after cooling down, cooling liquid will flow

back to water pump.

Thermostat : the open and close of thermostat is decided by the temperature of its surrounding cooling liquid, when

temperature gradually increases, thermostat opens until fully, at the same time, engine cooling liquid changes from small

recycle into big recycle.

Engine cooling system

Engine intake system 84

Principle chart of cooling system

(III)Technical parameter、maintenance parameter

Application specification

Application

specification

Cooling method

water-cooling

engine cooling liquid specs/brand

JAC original engine cooling liquid

Engine cooling liquid volume(expansion tank assembly)

6.5L (11.44pt)

type of thermostat

Wax-type thermostat

type of water pump

Centrifugal

number of cooling fan blade

7

opening temperature of thermostat

82 ℃ (181.4 ℉)

Full opening temperature of thermostat

95 ℃ (203 ℉)

Biggest stroke of thermostat valve rod

≥ 8mm

Engine cooling system

Engine intake system 85

(IV)Torque parameter

Torque table of key parts

No.

item

Torque

(N·m)

Remarks

1

Fixing bolts of water pump

8.4±0.6

2

Fixing bolts of water pump belt pulley

8.4±0.6

II、Fault diagnosis

(I)Fault diagnosis table

No. Fault description

Reason analysis

Solution

remar
ks

1

Poor radiation

Water pump fault

check if driving belt is worn or loose

Thermostat is stuck at the closing position

repair or replace thermostat

cooling fin is damaged, blocked with dust or
papers scrap

clean radiator

cooling fin has mechanical damage

replace radiator

cooling fan doesn’t work

Check fan circuit, replace cooling fan if
necessary

fan rotates with excessive resistance

fan blade damage

replace cooling fan

cooling liquid mixture proportion is not
accurate

replace cooling liquid

Engine cooling liquid has poor quality
(Engine cooling liquid is thick)

replace cooling liquid

2

Engine cooling
liquid not enough

cooling liquid hose hoop is loose

tighten cooling liquid hose hoop

cooling liquid hose crack

Replace cracked hose

Poor water pump seal

install again, replace water pump if
necessary

Radiator cap is loose

install again

Poor radiator cap seal

install again or replace radiator cap

Radiator crack

Replace radiator

liquid storage pot spills out

tail gas released to cooling system

Cylinder body blocked and leak

Replace cylinder body block

Engine cooling system

Engine intake system 86

No. Fault description Reason analysis

Solution

remarks

3

temperature of
cooling system is
too high

engine rotation is too high while
idle, drive too long, drive high
speed

Normal driving

driving system fault

check related parts, replace if
necessary

install the wrong wheel and tire

replace the right tire from jac

Braking blocked

Check braking system

electronic spark timing is wrong

check spark timing, replace related
parts if necessary

bumper ventilation exit is blocked, air flow is

not fluent

clear related parts

radiator grilling blocked, air flow is not fluent clear related parts

radiator blocked, air flow is not fluent

clear related parts

condenser blocked, air flow is not fluent

clear related parts

Engine cooling system

Engine intake system 87

(II)Flow scheme of diagnosis

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Engine cooling system

Engine intake system 88

Electric fan doesn’t work at high speed (continue )

Engine cooling system

Engine intake system 89

Electric fan doesn’t work at low speed

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Engine cooling system

Engine intake system 90

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Electric fan doesn’t work at low
speed(continue)

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