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1.Turn OFF the engine from
the idle state then check to see that the alternator and
others belt is not protruding from the pulley width of the
alternator drive belt auto-tensioner.
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2.Remove the alternator and
others belt (Refer to  ).
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3.Securely insert the
spindle handle or ratchet handle with a 12.7 mm insertion
angle into the jig hole of the alternator drive belt
auto-tensioner. Turn the alternator 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 alternator drive belt
auto-tensioner (Refer to ).
5.Install
the alternator and others belt (Refer to ).
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The alternator drive belt
auto-tensioner can be checked whether it is in good
condition by checking its tension.
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1.Check the alternator and
others belt tension (Refer to ).
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2.Measure the alternator and
others belt tension vibration frequency by the following
procedures:
(1)
Connect special tool microphone assembly (MB992082) to
special tool belt tension meter (MB992081) of 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.
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| 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.
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(4)
Press "Hz" button twice to change the display to the
frequency display (Hz).
(5)
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| caution |
- The temperature of the
surface of the belt should
be as close as possible to
normal 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 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
correspond to actual
values.
- Do not take the measurement
while the vehicle’s
engine is running.
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Hold the microphone to the middle of the alternator
and others drive belt between the pulleys (at the place
indicated by the arrow), about 10 -
15 mm away from the rear surface of the alternator and
others belt and so that it is perpendicular to the
alternator and others belt (within an angle of ±
15°).
(6)
Press the "MEASURE" button.
(7)
Gently tap the middle of the alternator and others 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 alternator and others belt is
within the standard value.
Standard value: 98
-
142 Hz
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| note |
To take the
measurement repeatedly, fillip the
alternator and others belt
again.
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(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 alternator drive
belt auto-tensioner (Refer to ).
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1.Check the alternator and
others belt tension (Refer to ).
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2.
| caution |
- When measuring the tension, make sure
that the engine is cold.
- Measure the tension after turning the
crankshaft clockwise one turn or
more.
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Use a belt tension gauge in the middle of the
alternator and others belt between the pulleys (at the place
indicated by the arrow) to measure that the alternator and
others belt tension is within the standard
value.
Standard value: 202 -
419 N
3.If not within the standard value,
replace the alternator drive belt auto-tensioner (Refer to
).
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