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2731. Install timing belt cover
Torque: 9.3N. m
32. Install generator assembly
33. Install right engine mounting bracket. See (Figure 67)
34. Install cylinder head cover sub-assembly
(a) Install 2 ventilation PCV hoses to the cylinder head cover.
(b) Connect the generator wire.
(c) Install the wire clip.
(d) Connect A/C compressor switch connector.
35. Install water pump pulley
36. Install power steering pump V-belt
37. Install A/C compressor to crankshaft pulleyV-belt
38. Install generator V-belt
39. Install left & right rear mounting bracket of engine.
40. Install ignition coil and high voltage cable
41. Hoist the engine back into the compartment
42. Install propeller shaft
43. Install air filter assembly with hose
44. Install oil pipe and water hoses
45. Install left and right front tires.
46. Check engine oil for leakage
47. Install all the wire harnesses and the cables on the engine connected to car bodyFigure 67
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31Replacement1. Disconnect all the wire harnesses and the cables on the engine connected to the car body.
2. Detach air filter assembly with hose
3. Disconnect oil pipe and water hose
4. Loose positive and negative cables of the battery.
5. Detach propeller shaft. Detach front exhaust pipe assembly
6. Loose engine left & right rear brackets after hoisting the engine.
7. Disconnect all the other connectors between the engine and the car body.
8. See "Provision 20, Section 2, Chapter 2". Lift the car body and take out the engine assembly.
9. Remove A/C compressor to the crankshaft pulleyV-belt.
10. Remove power steering pump V-belt.
11. Detach water pump fan pulley.
12. Disconnect ignition coil and high voltage cable.
13. Detach cylinder head cover sub-assembly.
14. Detach generator assembly.
15. Detach the camshaft.
16. Detach the throttle body assembly
17. Detach intake manifold stay No. 2.
18. Take out the dipstick
19. Detach No. 1 fuel delivery pipe
20. Detach the wire harness.
21. Detach the steering assisting pump assembly
22. Detach exhaust manifold. See (Figure 71)
23. Pry cylinder head from the dowel pin on the cylinder block.
See (Figure 72)
24. Remove the cylinder head gasket.
25. Install cylinder head gasket
26. Install cylinder head sub-assembly
27. Install exhaust pipe assembly.
(a) Install the new gasket and exhaust manifold with 5
bolts. Torque: 34N. m
(b) Install exhaust manifold stay with 2 bolts.
(c) Install upper heat shield with 4 bolts
Torque: 17N. mFigure 71
Figure 72
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3228. Install power steering adjusting pole
29. Install power steering pump assembly
30. Install wire harness.
31. Install No. 1 fuel delivery pipe
32. Set the new gasket on cylinder head with flange upward. Install water inlet hose. See
(Figure 73)
33. Install manifold stay No. 2
34. Connect front exhaust pipe assembly
35. Install throttle body assembly
36. Install camshaft
37. Install engine cylinder head cover
38. Hoist the engine back to the compartment.
39. Install engine right left and rear brackets
40. Install propeller shaft
41. Install ignition coil and high pressure cables. Install air filter assembly with hose
42. Install oil pipe and water hose
43. Install left & right front tire
44. Install all the wire harnesses and cables on the engine connected to car body
45. Check compression pressure
46. Check CO/HC. Check idle and ignition timingFigure 73
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52Chapter 6 Cooling System Inspection
(MR7131A, MR7151A, MR7161A)Section 1 System Check1. Check the cooling system for leakage. See (Figure 118)
(a) Fill coolant into radiator. Install the tester onto the radiator cap port.
(b) Start engine.
(c) The water pump pressure is 118Kpa. Check the pressure and ensure the
pressure will not drop. If the pressure drops, check the port, radiator and
water pump for leakage. If there is no leakage, check the heat exchanger,
cylinder block and cylinder head.
2. Check the engine coolant level in the reservoir.
The coolant level should be between low and full marks.
3. Check coolant quality
(a) Remove radiator cap.
To avoid being scalded, do not remove radiator cap while the engine and
radiator are still hot, as fluid and steam can be sprayed under pressure.
(b) There should not be excessive deposits of rust or scale around the radiator,
and the coolant should be free from oil.
(c) Reinstall the radiator cap.
4. Thermostat
Hint:
The thermostat temp indicates the valve opening temperature.
See (Figure 119).
(a) Immerse the thermostat in water and gradually heat the water.
(b) Check the valve opening temperature. Valve opening temperature: 80 -- 84°C
(c) Check the valve lift. See (Figure 120, Figure 121). Valve lift: 8mm or mor at
95°C
(d) Check the thermostat is fully closed when the thermostat is at low temperature
( 77°C).
5. Radiator cap valve
Standard opening pressure: 93-123kpa
Minimum opening pressure: 78kpa
If the opening pressure is less thanminimum, replace the radiator cap.Figure 118
Figure 119
Figure 120
Figure 121 Radiator Cap Tester8.0mm or
More ≤
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54Section 2 Water Pump, Thermostat and Radiator ReplacementHoist the engine from the compartment. See "Provison 20, Section 2, Chapter 2".
1. Replace water pump. See (Figure 125)
(1) Drain the coolant.
(2) Detach timing belt.
(3) Detach power steering pump assembly.
(4) Remove the oil dipstick guide.
(5) Detach water pump assembly.
(6) Install water pump assembly.
(7) The installation is in the reverse order of the removal.
2. Replace thermostat
(1) Remove thermostat (See Figure 126).
(2) Install thermostat.
a. Install a new gasket to the thermostat. See (Figure 127).
b.Align the main valve of the thermostat to the top of the
stud. Insert the thermostat into the water inlet case.
Hint:
The main valve is set at around 10°C as shown in the figure. See (Figure 128).
(3) Install inlet connector.
Figure 127 Figure 128
3. Replace radiator
(1) Open radiator cap.
(2) Open the drain valve and drain the coolant.
(3) Detach radiator water inlet hose.
(4) Detach radiator water outlet hose.Figure 125
Figure 126
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66f. The idle control valve is faulty;
g. The water temperature sensor is damaged;
h. The vacuum pressure sensor is damaged;
i. The air filter is blocked;
j. The injector leaks;
k. The compression pressure in the cylinder is too low;
l. The intake temperature sensor is damaged.
(3) Diagnosis and Troubleshooting
a. Check high pressure spark, check whether the high pressure spark on the ignition coil high pressure
bus and extension are OK, if the bus spark is week, replace the ignition coil, if the bus spark is OK
while the extension spark is too week, replace the ignition coil also; In addition, excessive spark
plug clearance will influence the starting feature, the clearance of the spark plug shall be adjusted
to normal value (0.8±0.1mm);
b. If there is low fuel pressure, check whether the battery voltage is OK, otherwise it shall be
troubleshot or replaced; check fuel pump check valve for leakage, check fuel filter and fuel pipe for
block, if there are leakage or block, replace or troubleshoot them;
c. If there is leakage for fuel pressure regulator, intake manifold is likely to be mixed with gasoline and
it is hard to start, troubleshoot or replace them;
d. Idle control valve can not be opened to maximum position due to mechanical wear, aging or control
circuit failure, the idle control valve shall be replaced and the control circuit failure shall be troubleshot;
e. If the water temperature sensor data is not accurate, it may cause small injection, check the water
temperature sensor based on the standard data and calibrate the data;
f. There is big time lag for intake pressure temperature sensor that makes it somewhat insensitive at
low speed and result in inaccurate injection, adjustment or replacement shall be made;
g. If the air cleaner filter is too dirty, the air flow resistance is excessively big, resulting in hard start,
as a result of it, the filter shall be replaced.
In a word, there are many factors causing the starting failure of the engine, analysis shall be made based on
the severe conditions of the faults. Generally speaking, check the ignition system first, then check intake
system, fuel system, control system, at last check the cylinder pressure, check the DTC before checking the
trouble. The diagnosis and troubleshooting procedures for starting failure of the engine are shown in (Figure
148).
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67Figure 148II. Fuel pipeline and Circuit Fault for Hard Engine StartingHard engine starting indicates that starter can crank but fail to start the engine, or it may take multiple
consecutive starting efforts or long time rotation to successfully start the engine. For hard start fault, make
sure whether it occurs at cold or hot status or regardless of the cold or hot status.
1. Symptom
When starting, engine cranks at normal speed, but it takes longer to start or fails to start although cranks.
2. Causes:
a. Air cleaner is clogged;
b. Intake temperature sensor fault;
c. Water temperature sensor fault; Engine can not start
Check the starting system Repair or replace the part if it is faulty
Check the high voltage spark
No high voltage spark or weak spark OK
Check the ignition system Is there any sign of cranking
No sign of cranking There is sign of cranking
Check the electric fuel pump for operation Check the air cleaner filter
Operative Inoperative OK Clogged
Check the injector Check the electric fuel Check the Replaced
pump and its control circuit spark clearance
Operative Inoperative
Measure the fuel pressure
Measure the fuel pressure Check the injector
Measure the vapor pressure,
water temperature and intake
Excessively low OK Check the control circuit air temperature sensor
Check the fuel Check thecylinder pressure Check the cylinder pressure
pressure regulator
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69j. Poor intake and exhaust valve seal, failed piston ring, low compression pressure;
h. Too many carbon deposit in spark plug and combustion chamber;
k. Water temperature switch and thermostat fault;
l. Aging of Oxygon sensor;
m. Incorrect ignition timing;
n. Check valve fault.
Figure 149Engine is difficult to start
Check whether the air cleaner is clogged Clogged
Troubleshooting
OK
Check the idle control valve NG
Repair or replace
OK
Check the fuel pressure Excessivly low
Service the electric fuel pump,
fuel filter and fuel pressure regulator
OK
Check the vacuum pressure sensor NG
Replace
OK
Check the water temperature sensor and intake air temperature sensor NG
Replace
OK
Check the start switch signal No
Service the start signal wire
OK
Check the ignition timing Misaligned
Adjust
OK
Check the cylinder pressure NG
Disassemble the engine
OK
Replace the ECU to retry