Mitsubishi Colt Ralliart. Manual - part 3

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-9

IGNITION TIMING CHECK

M1111001701428

AK203215

MB991910

16-PIN

MB991827

MB991824 

AC

1. Before inspection, set the vehicle to the 

pre-inspection condition.

2. Turn the ignition switch to the "LOCK" (OFF) 

position and then connect the M.U.T.-III to the 
diagnosis connector.

3. Set the timing light to the power supply line 

(terminal No.1) of the ignition coil No.1.

4. Start the engine and let it run at idle.
5. Select item No. 22 on the M.U.T.-III to measure 

engine idle speed and check that it is 
approximately 700 r/min.

6. Select No. 17 of the M.U.T.-III Actuator test.
7. Check that basic ignition timing is within the 

standard value.

Standard value: 5

° BTDC ± 3°

8. If the basic ignition timing is outside the standard 

value, inspect the MPI system (Refer to GROUP 
13A 

− Troubleshooting − Inspection chart for 

diagnosis code 

P.13A-20

).

CAUTION

If the test is not cancelled, a forced driving will 
continue for 27 minutes. Driving under this con-
dition may damage the engine.
9. Press the M.U.T.-III clear key (Select a forced 

driving cancel mode) to release the Actuator test.

10.Check that ignition timing is at the standard value.

Standard value: approximately 10

° BTDC

NOTE: 

.

•

The ignition timing may fluctuate within 

±

 7

°

 

BTDC. This is normal.

•

In higher altitude, the ignition timing is more 
advanced than the standard value by approxi-
mately 5

°

.

11.Remove the timing light.
12.Turn off the ignition switch and then remove the 

M.U.T.-III.

IDLE SPEED CHECK

M1111003501293

AK203215

MB991910

16-PIN

MB991827

MB991824 

AC

1. Before inspection, set the vehicle to the 

pre-inspection condition.

2. Turn the ignition switch to "LOCK" (OFF) position.
3. Connect the M.U.T.-III to the diagnosis connector.
4. Set the timing light to the power supply line 

(terminal No.1) of the ignition coil No.1.

5. Start the engine and let it run at idle.
6. Check that ignition timing is at the standard value.

Standard value: approximately 10

° BTDC

7. Check the idle speed.

Standard value: 700 

± 50 r/min 

NOTE: 

.

•

The idle speed is controlled automatically by 
the idle speed control system.

•

When using the M.U.T.-III, select item No. 22 
and take a reading of the idle speed.

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-10

8. If the idle speed is outside the standard value, 

inspect the MPI system (Refer to GROUP 13A 

− 

Troubleshooting 

− Inspection chart for diagnosis 

code 

P.13A-20

).

IDLE MIXTURE CHECK

M1111002100965

AK203215

MB991910

16-PIN

MB991827

MB991824 

AC

1. Before inspection, set the vehicle to the 

pre-inspection condition.

2. Turn the ignition switch to "LOCK" (OFF) position.
3. Connect the M.U.T.-III to the diagnosis connector.
4. Set the timing light to the power supply line 

(terminal No.1) of the ignition coil No.1.

5. Start the engine and let it run at idle.
6. Check that ignition timing is at the standard value.

Standard value: approximately 10

° BTDC

7. Run the engine at 2,500 r/min for 2 minutes.
8. Set the CO, HC tester.
9. Check the CO contents and the HC contents at 

idle.

Standard value

CO contents: 0.1 % or less
HC contents: 100 ppm or less

10.If there is a deviation from the standard value, 

inspect the MPI system (Refer to GROUP 13A 

− 

Troubleshooting 

− Inspection chart diagnosis 

code 

P.13A-20

)

VALVE CLEARANCE CHECK AND 
ADJUSTMENT

M1111001500487

NOTE: Perform the valve clearance check and 
adjustment at the engine cold state.
1. Remove all ignition coils.
2. Remove the cylinder head cover.

CAUTION

Turn the crankshaft always clockwise.

AK306138AB

Timing mark

3. Turn the crankshaft clockwise, and align the 

timing mark on the exhaust camshaft sprocket 
against the upper face of the cylinder head as 
shown in Figure. Therefore, No.1 cylinder goes to 
the compression top dead centre.

AK305589

Exhaust valve side

No. 1

No. 1

No. 3

No. 2

Intake valve side

AB

4. Using a thickness gauge, measure the valve 

clearance with the arrow shown in Figure. If 
deviated from the standard value, make note for 
the valve clearance.

Standard value:

Intake valve 0.22 

± 0.04 mm 

Exhaust valve 0.30 

± 0.04 mm 

AK306139AB

Timing mark

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-11

5. Turn the crankshaft clockwise 360 degrees, and 

put the timing mark on the exhaust camshaft 
sprocket in position shown in Figure. Therefore, 
No.4 cylinder goes to the compression top dead 
centre. 

AK305589

Exhaust valve side

No. 2

No. 3

No. 4

No. 4

Intake valve side

AC

6. Check the valve clearance with the arrow shown 

in Figure. In the same procedure as 4.

7. If the valve clearance is deviated from the 

standard value, remove the camshaft and the 
valve tappet. For the camshaft removal, refer to 
Camshaft Removal and Installation 

P.11A-17

 .

AK304938

AB

Wall
thickness

8. Using a micrometer, measure the thickness of the 

removed valve tappet.

9. Calculate the thickness of the newly installed 

valve tappet through the following equation.
A: thickness of newly installed valve tappet 
B: thickness of removed valve tappet 
C: measured valve clearance

Equation

Intake valve: A = B + (C 

− 0.22 mm)

Exhaust valve: A = B + (C 

− 0.30 mm)

NOTE: 

AK305693

Identification mark

AB

The valve tappet ranges 2.70 

−

 3.30 mm and has 

31 types per 0.02 mm. The thickness below a 
decimal point is stamped on the reverse side of 
the valve tappet. 
Example: In case of 2.90 mm, "90" is stamped. 

10.Install the valve tappet selected through the 

procedure 10, and put the camshaft in position. 
For the camshaft installation, refer to Camshaft 
Removal and Installation 

P.11A-17

 .

11.Remove any liquid gasket remaining on the 

cylinder head cover, the timing chain case and the 
cylinder head.

AK304933AB

CAUTION

The cylinder head cover should be installed 
within 3 minutes of applying liquid gasket.
12.Apply a 4 mm bead of liquid gasket as illustrated.

Specified sealant:

LOCTITE 5971 or exact equivalent

AK401050

AB

4

8

5

10

2

6

9

1

7

3

Timing chain side

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-12

13.Install the cylinder head cover and in accordance 

with the procedure shown in Figure, tighten the 
bolt of the cylinder head cover.

Tightening torque: 9.0 

± 1.0 N⋅m

14.Install the ignition coils.

COMPRESSION PRESSURE CHECK

M1111002601491

1. Before inspection, set the vehicle to the 

pre-inspection condition.

2. Remove all of the ignition coils and spark plugs.

AK305808AB

Injector connectors

3. Disconnect the all of the injector connectors.

CAUTION

• Keep away from the spark plug hole when 

cranking.

• If compression is measured with water, oil, 

fuel, etc., that has come from cracks inside 
the cylinder, these materials will become 
heated and will gush out from the spark plug 
hole, which is dangerous.

4. Cover the spark plug hole with a shop towel etc., 

and after the engine has been cranked, check that 
no foreign material is adhering to the shop towel.

AK305516AB

Compression gauge

5. Set compression gauge to one of the spark plug 

holes.

6. Crank the engine with the throttle valve fully open 

and measure the compression pressure.
Standard value (at engine speed of 300 r/min): 

1,200 kPa

Limit (at engine speed of 300 r/min): Minimum 

850 kPa

7. Measure the compression pressure for all the 

cylinders, and check that the pressure differences 
of the cylinders are below the limit.

Limit: Maximum 98 kPa

8. If there is a cylinder with compression or a 

compression difference that is outside the limit, 
pour a small amount of engine oil through the 
spark plug hole, and repeat the operations in 
steps from 5 to 7.
(1) If the compression increases after oil is added, 

the cause of the malfunction is a worn or 
damaged piston ring and/or cylinder inner 
surface.

(2) If the compression dose not rise after oil is 

added, the cause is a burnt or defective valve 
seat, or pressure is leaking from the gasket.

9. Connect the crank angle sensor connector.
10.Install the spark plugs and spark plug cables.
11.Use the M.U.T.-III to erase the diagnosis codes.

NOTE: This will erase the diagnosis code result-
ing from the injector connectors being discon-
nected.