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1.
| caution |
- When measuring the vibration
frequency, make sure that the engine is cold.
- Measure the vibration frequency after turning the crankshaft clockwise one turn
or more.
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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.
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<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).
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5.
| caution |
- 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.
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Hold the 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°).
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 (Reference):
113 - 264 Hz <M/T>
141 - 249 Hz <A/T>
| note |
To take the measurement repeatedly, fillip the water pump drive 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.
9.If not within the standard value, replace the water pump drive belt (Refer to  ).
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1.Use a belt tension gauge in the middle of the drive belt between the pulleys shown in
the figure (at the place indicated by the arrow) to check that the drive belt tension is within
the standard value.
Standard value (Reference):
100 - 550 N <M/T>
158 - 496 N <A/T>
2.If not within the standard value, replace the water pump drive belt (Refer to ).
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