|
|
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 drive belt
auto-tensioner.
|
|
|
2.Remove the drive belt
(Refer to GROUP 14 - Radiator Fan  ).
|
|
3.Securely insert the
spindle handle or ratchet handle with a 12.7 mm insertion
angle into
the jig hole of the drive belt auto-tensioner. Turn the
drive belt 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 drive belt auto-tensioner
(Refer to ).
5.Install
the drive belt (Refer to GROUP 14 - Radiator Fan ).
|
|
|
The drive belt auto-tensioner can
be checked whether it is in good condition by checking
its tension.
|
|
|
1.Check the drive belt
tension (Refer to ).
|
|
2.Measure the drives belt
tension vibration frequency by the following
procedures:
(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 the numeral key of "1" and check that "No.1" appears
on the upper left of the
display.
|
|
| 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.
|
|
(4)
Press "Hz" button twice to change the display to the
frequency display (Hz).
(5)
|
|
| 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 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
correspond to actual
values.
- Do not take the measurement
while the vehicle’s
engine is running.
|
|
Hold special tool (MB992080) to the middle of the
drive belt between the pulleys (at the
place indicated by arrow), approximately 10 - 15 mm
away from the rear surface of the
drive belt so that it is perpendicular to the drive belt
(within an angle of ± 15 degree).
(6)
Press the "MEASURE" button.
(7)
Gently tap the middle of the drive 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 drive belt is within the standard
value.
Standard value: 88 - 121
Hz
|
|
| note |
To take the
measurement repeatedly, fillip the
drive belt again.
|
|
(8)
After the completion of the measurement, press and hold the
"POWER" button to turn
off the power supply.
3.If not within the standard
value, replace the drive belt auto-tensioner (Refer to ).
|
|
|
1.Check the drive belt
tension (Refer to ).
|
|
2.Use a belt tension gauge
in the middle of the drive belt between the pulleys (at the
place
indicated by the arrow) to measure that the drive belt
tension is within the standard value.
Standard
value: 197 - 371 N
3.If not within
the standard value, replace the drive belt auto-tensioner
(Refer to ).
|