Mitsubishi Galant 9G. Manual — part 323

ON-VEHICLE SERVICE

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ENGINE MECHANICAL <2.4L ENGINE>

11A-8

ON-VEHICLE SERVICE

DRIVE BELT TENSION CHECK

M1111003100485

CAUTION

Check the drive belt tension after turning the crankshaft
clockwise one turn or more.
1. Make sure that the indicator mark is within the area marked

with A in the illustration.

2. If the mark is out of the area, replace the drive belt. (Refer to

P.11A-27

).

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

AUTO-TENSIONER CHECK

M1111003000217

OPERATION CHECK

1. Turn OFF the engine from the idle state then check to see

that the drive belt is not protruding from the pulley width of
the auto-tensioner.

2. Remove the drive belt. (Refer to

P.11A-27

).

3. Securely insert the spindle handle or ratchet handle with a

12.7 mm (1/2-inch) insertion angle into the jig hole of the
auto tensioner. Turn the auto-tensioner to the left and right
to check and see that there is no threading.

4. If there are any problems in the procedure 1 or 3, replace

the auto-tensioner. (Refer to

P.11A-51

).

5. Install the drive belt. (Refer to

P.11A-27

).

FUNCTION CHECK

You can verify if the auto-tensioner is defective or not by check-
ing the drive belt tension.

.

When using scan tool MB991958

Required Special Tools:

• MB991668: Belt Tension Meter Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991910: MUT-III Main Harness A

1. Check the drive belt tension. (Refer to

P.11A-8

).

2. Measure the drive belt tension vibration frequency by the

following procedures:

AC301702AB

INDICATOR MARK

A

AC301703

ON-VEHICLE SERVICE

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ENGINE MECHANICAL <2.4L ENGINE>

11A-9

CAUTION

To prevent damage to scan tool MB991824, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991824.

(1) Connect special tool MB991668 to scan tool MB991824.
(2) Connect scan tool MB991910 to scan tool MB991824.
(3) Connect scan tool MB991910 to the data link connector.
(4) Turn the ignition switch to the "ON" position and select

"Belt Tension" from the menu scan tool MB991824
screen.

CAUTION

• The temperature of the surface of the belt should be as

close to normal temperature as possible.

• Do not allow any contaminants such as water or oil to

get onto the microphone.

• If strong gusts of wind blow against the microphone or

if there are any loud sources of noise nearby, the val-
ues measured by the microphone may not correspond
to actual values.

• If the microphone is touching the belt while the mea-

surement is being made, the values measured by the
microphone may not correspond to actual values.

• Do not take the measurement while the vehicle's engine

is running.

(5) Hold special tool MB991668 to the middle of the drive

belt between the pulleys (at the place indicated by arrow),
approximately 10

− 20 mm (0.40 − 0.78 inch) away from

the rear surface of the belt so that it is perpendicular to
the belt (within an angle of

± 15 degree).

(6) Gently tap the middle of the belt between the pulleys (the

place indicated by the arrow) with your finger as shown in
the illustration, and measure that the vibration frequency
of the belt is within the standard value.

Standard value: 120

− 154 Hz

3. If not within the standard value, replace the auto-tensioner.

(Refer to

P.11A-51

).

.

When using a tension gauge

1. Check the drive belt tension. (Refer to

P.11A-8

).

AC302077
AC305412

AC306958AB

MB991824

MB991910

MB991668

DATA LINK

CONNECTOR

AC301266AB

MB991668

10 – 20 mm
(0.40 – 0.78 in)

WATER
PUMP
PULLEY

GENTLY
TAP WITH
YOUR
FINGER

15˚

15˚

GENERATOR
PULLEY

ON-VEHICLE SERVICE

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ENGINE MECHANICAL <2.4L ENGINE>

11A-10

2. Use a belt tension gauge in the middle of the belt between

the pulleys (at the place indicated by the arrow) to measure
that the belt tension is within the standard value.

Standard value: 340

− 562 N

3. If not within the standard value, replace the auto-tensioner.

(Refer to

P.11A-51

).

VALVE CLEARANCE CHECK AND ADJUSTMENT

M1111001500283

1. Before checks, check that the engine oil, starter and battery

are normal. Also, set the vehicle in the following condition:

• Engine coolant temperature: 80 − 95°C (176 − 203°F)

• Lights and all accessories: OFF

• Transaxle: P range

NOTE: Vehicles for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks and adjustment.

2. Remove all of the ignition coils.
3. Remove the rocker cover.
4. Turn the crankshaft clockwise until the notch on the pulley is

lined up with "T" mark on the timing indicator.

5. Move the rocker arms on the No.1 and No.4 cylinders up

and down by hand to determine which cylinder has its piston
at the top dead center on the compression stroke.
If both intake and exhaust valve rocker arms have a valve
lash, the piston in the cylinder corresponding to these rocker
arms is at the top dead center on the compression stroke.

6. Valve clearance inspection and adjustment can be

performed on rocker arms indicated by white arrow mark
when the No.1 cylinder piston is at the top dead center on
the compression stroke, and on rocker arms indicated by
black arrow mark when the No.4 cylinder piston is at the top
dead center on the compression stroke.

AC301267

BELT TENSION
GAUGE

AB

GENERATOR
PULLEY

WATER PUMP
PULLEY

AK204362AD

EXHAUST VALVE SIDE

No. 1 No. 2 No. 3 No. 4

INTAKE VALVE SIDE

ON-VEHICLE SERVICE

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ENGINE MECHANICAL <2.4L ENGINE>

11A-11

7. Measure the valve clearance.

If the valve clearance is not as specified, loosen the rocker
arm lock nut and adjust the clearance using a thickness
gauge while turning the adjusting screw.

Standard value (hot engine):

<VEHICLES EXCEPT FOR CALIFORNIA EMISSION

REGULATION >

Intake side: 0.20 mm (0.008 inch)
Exhaust side: 0.30 mm (0.012 inch)

<VEHICLES FOR CALIFORNIA EMISSION REGULA-

TION>

Intake side: 0.20 mm (0.008 inch)
Exhaust side: 0.30 mm (0.012 inch)

8. While holding the adjusting screw with a screwdriver to

prevent it from turning, tighten the lock nut to the specified
torque.

Tightening torque: 9

± 1 N⋅m (80 ± 9 in-lb)

9. Turn the crankshaft through 360 degree angle to line up the

notch on the crankshaft pulley with the "T" mark on the
timing indicator.

10.Repeat steps (7) and (8) on other valves for clearance

adjustment.

11.Install the rocker cover.
12.Install the ignition coils.

ROCKER ARM PISTON OPERATION CHECK

M1111051000142

1. Remove all of the ignition coils.
2. Remove the rocker cover.
3. Remove the engine oil control valve.
4. Remove the engine oil pressure switch.
5. Turn the crankshaft clockwise until the notch on the

crankshaft pulley is lined up with "T" mark on the lower cover
of timing belt.

6. Move the rocker arms on the No.1 and No.4 cylinders up

and down by hand to determine which cylinder has its piston
at the top dead center on the compression stroke.

NOTE: The rocker arm piston operation check can be per-
formed on rocker arms indicated by white arrow mark when the
No.1 cylinder piston is at the top dead center on the compres-
sion stroke, and on rocker arms indicated by black arrow mark
when the No.4 cylinder piston is at the top dead center on the
compression stroke.

AK302683AB

ENGINE OIL
PRESSURE SWITCH
ENGINE OIL
CONTROL VALVE

IGNITION COILS

ROCKER COVER

AK204362AH

EXHAUST VALVE SIDE

No. 1 No. 2 No. 3 No. 4

INTAKE VALVE SIDE