Mitsubishi 380. Manual - part 315

MAINTENANCE SERVICE

GENERAL

00-38

5. SPARK PLUGS (REPLACE)

M1001002000346

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( Refer to 
Maintainence Schedule).
Spark plug type

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

Spark plug gap: 1.0 

− 1.1 mm 

3. Install the spark plugs and tighten to 25 

± 5 N⋅m (18 ± 4 

ft-lb).

6. TIMING BELT (REPLACE)

M1001002300273

Replace the belt with a new one according to the vehicle main-
tenance schedule  to assure proper engine performance.

<3.8L ENGINE>

For removal and installation procedures, refer to GROUP 11C,  
Engine Mechanical <3.8L Engine> 

− Timing Belt − Removal 

and Installation 

P.11A-46

.

MAKER

3.8L ENGINE

BOSCH

FR8DI30

AKX00383

AKX00383

IRIDIUM TIP

AK

MAINTENANCE SERVICE

GENERAL

00-39

7. DRIVE BELTS (FOR ALTERNATOR, POWER 
STEERING PUMP AND AIR CONDITIONING) 
(CHECK)

M1001008700031

ALTERNATOR DRIVE BELT TENSION CHECK 
<3.8L ENGINE>

.

WHEN USING DIAGNOSTIC TOOL (MUT-III)

Required Special Tools:

• MB991668: Belt Tension Meter Set
• Diagnostic Tool (MUT-III)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991910: MUT-III Main Harness A (BLUE)

CAUTION

To prevent damage to DIAGNOSTIC TOOL (MUT-III), always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting.
1. Connect Belt Tension Meter Set (MB991668) to V.C.I 

(MB991824).

2. Connect MUT-III Main Harness A (BLUE) (MB991910) to 

V.C.I (MB991824).

3. Connect MUT-III Main Harness A (BLUE) (MB991910) to the 

data link connector.

4. Turn the ignition switch to the "ON" position and select "Belt 

Tension" from the menu V.C.I (MB991824) screen.

AC302077

AC305412

01DB039A

MB991824

MB991910

MB991668

DATA LINK

CONNECTOR

MAINTENANCE SERVICE

GENERAL

00-40

CAUTION

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

close as possible to underhood temperature.

• Do not let any contaminants such as water or oil 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 (microphone) to the middle of 

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

− 20 mm (0.4 − 0.8 inch) away from the 

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

± 15 degree angle).

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 check that the vibration frequency of the 
belt is within the standard value.

Standard value: 

NOTE: Because the frequency depends on the belt material, 
confirm Part No. shown on the reverse of the belt.

.

Part No.

Vibration frequency Hz

MD368275

133 

− 158

MN158101, MN187016

143 

− 169

00DB081A

15° 15°

MB991668

(MICROPHONE)

10 – 20mm

(0.4 – 0.8in)

AIR 

CONDITIONING

COMPRESSOR

PULLEY

ALTERNATOR

PULLEY

TENSIONER

PULLEY

CRANK

SHAFT

PULLEY

TAP LIGHTLY

WITH A FINGER

MAINTENANCE SERVICE

GENERAL

00-41

WHEN USING THE TENSION GAUGE

Use a belt tension gauge to check that the belt tension is within 
the standard value.

Standard value: 490 

− 686 N (110 − 154 lb)

.

BELT DEFLECTION CHECK

Apply approximately 98 N (22 lb) of force to the middle of the 
drive belt between the pulleys (at the place indicated by the 
arrow) and check that the amount of deflection in within the 
standard value.

Standard value: 8.4 

− 10.7 mm (0.33 − 0.42 in)

00DB082A

TENSION

GAUGE

AIR 

CONDITIONING

COMPRESSOR

PULLEY

ALTERNATOR

PULLEY

TENSIONER

PULLEY

CRANK

SHAFT

PULLEY

00DB083A

AIR 

CONDITIONING

COMPRESSOR

PULLEY

ALTERNATOR

PULLEY

TENSIONER

PULLEY

CRANK

SHAFT

PULLEY

APPROXIMATELY

98 N (22 lb)