Content .. 645 646 647 648 ..

Mitsubishi Colt Ralliart. Manual - part 647

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4G1>

11C-8

ON-VEHICLE SERVICE

DRIVE BELT TENSION CHECK AND
ADJUSTMENT

M1111003101400

ALTERNATOR DRIVE BELT TENSION
CHECK

Check the drive belt tension in the following proce-
dure.

Standard value:

Item

When
checked

When
adjusted

When
replaced

Vibration
frequency
Hz

218

− 266

231

− 255 308 − 344

Tension N

392

− 588

441

− 539 785 − 981

Deflection
mm
(Reference)

6.3

− 8.0

6.6

− 7.5

4.1

− 5.0

NOTE: The vibration frequency measuring method is
recommended for check and adjustment of the drive
belt tension.

AC507219AB

MB992082

MB992081

Belt tension meter set (MB992080)

1. Connect the Special tool microphone assembly

(MB992082) to the Special tool belt tension meter
(MB992081) of the Special tool belt tension meter
set (MB992080).

2. Press the "POWER" button to turn on the power

supply.

3. Press number key 1. Check to ensure that "No.

01" appears on the upper left of the display and
that the following numeric values are displayed for
individual items (M, W, and S):
M 000.9 g/m
W 010.0 mm/R
S 0100 mm
If numeric values have not been entered (new
tool), set them according to the belt specifications
as shown below. Once you set them, you do not
have to set them again. The settings remain
undeleted even after battery replacement.
NOTE: This operation is to temporarily set the
preset data such as the belt specifications,
because if the measurement is taken without input
of the belt specifications, conversion to tension
value (N) cannot be made, resulting in judgement
of error.
<Setting procedure>
(1) Press down the "MASS" button till the belt

mass select display appears.

(2) Press the "UP" or "DOWN" button to select "01

1.5GT 0.9" and press the "MEASURE" button
to decide it.
Check to ensure that "M 000.9 g/m" is
displayed.

(3) Press the "WIDTH" button to change to the

belt width input display.

(4) Press number keys 0, 1, 0, and 0 sequentially,

and press the "SELECT" button to apply them.
Check to ensure that "W 010.0 mm/R"
appears on the display.

(5) Press the "SPAN" button to change to the

span length input display.

(6) Press number keys 0, 1, 0, and 0 sequentially,

and press the "SELECT" button to apply them.
Check to ensure that "S 0100 mm" appears on
the display.

4. Press "Hz" button twice to change the display to

the frequency display (Hz).

Main

Index

Group

TOC

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4G1>

11C-9

CAUTION

•

AK600562

15˚

10 – 15 mm

Crankshaft
pulley

Alternator
pulley

Water pump
pulley

MB992080
(Microphone)

The temperature of the surface of the belt should

be as close as possible to normal tempera-
ture.

• 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 is loud sources of
noise nearby, the values measured by the
microphone may not correspond to actual
values.

• If the microphone is touching the belt while

the measurement is being made, the values
measured by the microphone may not corre-
spond to actual values.

• Do not take the measurement while the vehi-

cle's engine is running.

5. Hold the microphone to the middle of the drive

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

− 15 mm away from the rear

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

± 15 °).

6. Press the "MEASURE" button.
7. 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.
NOTE: To take the measurement repeatedly, fillip
the belt again.

8. After the completion of the measurement, press

and hold the "POWER" button to turn off the
power supply.

NOTE: The vibration frequency measuring method is
recommended for check and adjustment of the drive
belt tension.

AK600561

MB991668

MB991824

MB991910

Diagnosis

connector

CAUTION

To prevent damage to special tool V.C.I.
(MB991824), always turn the ignition switch to
the "LOCK" (OFF) position before connecting or
disconnecting special tool V.C.I. (MB991824).
1. Connect the special tool belt tension meter set

(MB991668) to the special tool V.C.I (MB991824).

2. Connect special tool M.U.T.-III main harness A

(MB991910) to special tool V.C.I. (MB991824).

3. Connect special tool M.U.T.-III main harness A

(MB991910) to the diagnosis connector.

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

select "Belt Tension Measurement" from the menu
screen.

Main

Index

Group

TOC

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4G1>

11C-10

CAUTION

• The temperature of the surface of the belt

should be as close as possible to normal tem-
perature.

• 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 is loud sources of
noise nearby, the values measured by the
microphone may not correspond to actual
values.

• If the microphone is touching the belt while

the measurement is being made, the values
measured by the microphone may not corre-
spond to actual values.

• Do not take the measurement while the vehi-

cle's engine is running.

AK402044

15˚

MB991668
(Microphone)

10 – 20 mm

Crankshaft
pulley

Alternator
pulley

Water pump
pulley

5. Hold the microphone to the middle of the drive

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

− 20 mm away from the rear

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

± 15 °).

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.

<When using the tension gauge>

AK402045

Tension
Gauge

Crankshaft
pulley

Alternator
pulley

Water pump
pulley

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

<Belt deflection check>

AK402046

Approximately
100 N

Crankshaft
pulley

Alternator
pulley

Water pump
pulley

Deflection

Apply approx. 100 N 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
is within the standard value.

AC402698

Adjusting
bolt

Nut

Locking bolt

If not within the standard value, adjust the belt ten-
sion by the following procedure.
1. Loosen the nut of the alternator pivot bolt.
2. Loosen the lock bolt.
3. Use the adjusting bolt to adjust the belt tension

and belt deflection to the standard values.

4. Tighten the nut of the alternator pivot bolt.

Tightening torque: 44

± 10 N⋅m

5. Tighten the nut of the lock bolt.

Tightening torque: 23

± 2 N⋅m

6. Tighten the adjusting bolt.

Tightening torque: 5.0

± 1.0 N⋅m

CAUTION

When checking the belt tension, turn the crank-
shaft clockwise one turn or more.
7. Check the belt tension, and readjust if necessary.
8. When the belt tension is adjusted by measuring

the deflection, adjust it with a tool for vibration
frequency measurement or tension measurement
afterward.

Main

Index

Group

TOC

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4G1>

11C-11

A/C COMPRESSOR DRIVE BELT TEN-
SION CHECK AND ADJUSTMENT

AC205664AB

Tensioner
pulley

Crankshaft pulley

A/C compressor
pulley

Check the drive belt tension by the following proce-
dures.

Standard value:

Item

When
checked

When
adjusted

When
replaced

Vibration
frequency Hz

165

− 213 179 − 203 213 − 253

Tension N

294

− 490 343 − 441 490 − 686

Deflection
mm
(Reference)

8.9

− 11.2 9.3 − 10.7 6.6 − 8.6

Gently tap the centre of the belt between the pulleys
(arrow), and check that the belt vibration frequency is
within the standard value.

<When tension is measured>

Place a belt tension gauge at the centre of the belt
between the pulleys (arrow), and check that the belt
tension is within the standard value.

<When deflection is measured>

Apply approx. 100 N of pressure against the location
between the pulleys shown by the arrow in the illus-
tration and then measure the deflection.

If not within the standard value, adjust the belt ten-
sion by the following procedure.

AC205665AB

Adjusting bolt

Tensioner
pulley

Locking nut

1. Loosen the locking nut of the tensioner pulley.
2. Use the adjusting bolt to adjust the belt tension.

The tension will increase when turning the
adjusting bolt clockwise, and decrease when
turning anti-clockwise.

3. Tighten the locking nut of the tensioner pulley at

the specified torque.

Tightening torque: 48

± 6 N⋅m

4. Tighten the adjusting bolt at the specified torque.

Tightening torque: 5.0

± 1.0 N⋅m

CAUTION

When checking the belt tension, turn the crank-
shaft clockwise one turn or more.
5. Check the belt tension, and readjust if necessary.
6. When the belt tension is adjusted by measuring

the deflection, adjust it with a tool for vibration
frequency measurement or tension measurement
afterward.

Main

Index

Group

TOC

Content .. 645 646 647 648 ..