Mitsubishi Evolution X. Manual - part 322

MAINTENANCE SERVICE

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GENERAL

00-63

MAINTENANCE SERVICE

1. FUEL SYSTEM (TANK, PIPE LINE AND 
CONNECTION, AND FUEL TANK FILLER TUBE 
CAP) (CHECK FOR LEAKS)

M1001001600367

Check for damage or leakage in the fuel lines and connections.

2. FUEL HOSES (CHECK CONDITION)

M1001001700331

1. Inspect the surface of fuel hoses for heat and mechanical 

damage. Hard and brittle rubber, cracking, tears, cuts, 
abrasions and excessive swelling indicate deterioration of 
the rubber.

2. If the fabric casing of the rubber hose is exposed by cracks 

and abrasions in the fuel system, the hoses should be 
replaced.

3. AIR CLEANER ELEMENT (REPLACE)

M1001001800424

The air cleaner element will become dirty during use, reducing 
its effectiveness. Replace it with a new one.
Replacement of air cleaner element
1. Unclamp the air cleaner housing.
2. Remove the air cleaner element and install a new one.
3. When clamping the air cleaner housing in place, be sure that 

the cover is completed closed.

4. EVAPORATIVE EMISSION CONTROL SYSTEM 
(EXCEPT EVAPORATIVE EMISSION CANISTER) 
(CHECK FOR LEAKS AND CLOGGING)

M1001001900410

If the fuel-vapor vent line is clogged or damaged, fuel vapor will 
escape into the atmosphere causing excessive emissions. Dis-
connect the line at both ends, and blow it clean with com-
pressed air. Remove the fuel tank filler tube cap from the filler 
tube and check to see if there is evidence that the seal makes 
improper contact to the filler tube.

AC709600AB

MAINTENANCE SERVICE

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GENERAL

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5. SPARK PLUGS (REPLACE)

M1001002000476

CAUTION

Iridium plugs are used. Use care not to damage the iridium 
tips of the plugs. Do not adjust the spark plug gap.
1. Spark plugs must spark properly to assure proper engine 

performance and reduce exhaust emission level.
Therefore, they should be replaced periodically with new 
ones.
Spark plug type

2. The new plugs should be checked for the proper gap.

Spark plug gap: 0.5 

− 0.6 mm (0.020 − 0.023 inch)

3. Install the spark plugs and tighten to 18 

± 2 N⋅ m (13 ± 1 

ft-lb).

6. INTAKE AND EXHAUST VALVE CLEARANCE 
(INSPECT AND ADJUST)

M1001012900180

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

CAUTION

Turn the crankshaft always clockwise.
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 center.

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 0.20 

± 0.03 mm (0.008 ± 0.0012 inch)

Exhaust valve 0.30 

± 0.03 mm (0.012 ± 0.0012 inch)

Maker

Identifcation No.

NGK

ILKR8E6

AK704210 AB

Iridium 
tip

Platinum
tip

AK604565

Timing mark

AC

10

11

12

7

8

8

3

4

4

3

1

2

2

1

5

6

6

5

9

AK502387AG

Intake valve side

No.1

No.2

No.3

Exhaust valve side

No.1

MAINTENANCE SERVICE

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GENERAL

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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 center.

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-25

.

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 

− 0.20 mm (0.008 inch)]

Exhaust valve: A = B + [C 

− 0.30 mm (0.012 inch)]

NOTE: The valve tappet ranges 3,000 

−

 3,690 mm (0.1181 

−

 

0.1453 inch) and has 47 types per 0.015 mm (0.0006 inch). 
The thickness below a decimal point is stamped on the 
reverse side of the valve tappet. 

10.Install the valve tappet selected through the procedure 9, 

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

P.11A-25

.

11.After installing the timing chain, measure the valve 

clearance using the procedure 3 to 6. Confirm the clearance 
is within the standard value.

CAUTION

Completely remove all the old FIPG, which might be 
remaining among the components.
12.After completely removing the liquid gasket adhering on the 

timing chain case, cylinder block and cylinder head, 
degrease them with white gasoline.

AK604566AC

Timing mark

10

11

12

7

8

8

3

4

4

3

1

2

2

1

5

6

6

5

9

AK502388 AF

Intake valve side

No.3

No.4

Exhaust valve side

No.2

No.4

AK304938

AE

Wall thickness

AK704211

0

0

3

0

.

AB

Thickness stamp

Under view

MAINTENANCE SERVICE

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GENERAL

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CAUTION

The cylinder head cover should be installed within 3 min-
utes of applying liquid gasket.
13.Apply a 4 mm bead of liquid gasket as illustrated.

Specified sealant:

THREE BOND 1217G or exact equivalent

14. Install the cylinder head cover and tighten the tightening 

bolts using the following procedures.

(1) Temporarily tighten to the following torque in order shown 

in the illustration.

Tightening torque: 3.0 

± 1.0 N⋅ m (27 ± 9 in-lb)

(2) Tighten to the specified torque in order shown in the 

illustration.

Specified torque: 5.5 

± 0.5 N⋅ m (49 ± 9 in-lb)

15.Install the ignition coils.

7. DRIVE BELT (FOR THE GENERATOR AND 
POWER STEERING OIL PUMP) (REPLACE)

M1001002500589

1. Remove the radiator condenser tank. (Refer to GROUP 14 

− 

Radiator 

P.14-31

).

CAUTION

Check the drive belt tension after turning the crankshaft 
clockwise one turn or more.
2. Make sure that the indicator mark on the auto-tensioner is 

within the area marked with A in the illustration.

3. If the mark is out of the area A, replace the drive belt (Refer 

to 

P.11A-21

).

NOTE: The drive belt tension check is not necessary as the 
auto-tensioner is adopted.

4. Install the radiator condenser tank. (Refer to GROUP 14 

− 

Radiator 

P.14-31

).

AK

701438

Cylinder head

Timing chain case assembly

AD

φ 4.0 mm

(0.16 in)

φ 4.0 mm (0.16 in)

2.0 mm
(0.08 in)

2.0 mm
(0.08 in)

AK502760AF

10

16

15

14

17

18

1

3

4

11

12

9

5

2

6

7

8

13

AC506730 AC

A

Indicator mark 

Auto-tensioner