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Check the drive belt tension in the following procedure.
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Standard value:
Item
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When checked
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When adjusted
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When replaced
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Vibration frequency Hz
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213 - 261
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226 - 250
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302 - 337
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Tension N
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392 - 588
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441 - 539
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785 - 981
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Deflection mm (Reference)
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6.3 - 8.0
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6.6 - 7.5
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4.1 - 5.0
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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.
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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 |
- 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 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.
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8.After the completion of the measurement, press and hold the "POWER" button to turn
off the power supply.
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Use a belt tension gauge to check that the belt tension is within the standard value.
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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.
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If not within the standard value, adjust the belt tension 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
7.
| caution |
When checking the belt tension, turn the crankshaft clockwise
one turn or more.
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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.
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Check the drive belt tension by the following procedures.
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Standard value:
Item
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When checked
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When adjusted
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When replaced
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Vibration frequency Hz
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165 - 213
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179 - 203
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213 - 253
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Tension N
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294 - 490
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343 - 441
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490 - 686
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Deflection mm (Reference)
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8.6 - 11.6
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9.3 - 10.8
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6.6 - 8.6
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Gently tap the centre of the belt between the pulleys (arrow), and check that the belt
vibration frequency is within the standard value.
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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.
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Apply approx. 100 N of pressure against the location between the pulleys shown by the
arrow in the illustration and then measure the deflection.
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If not within the standard value, adjust the belt tension by the following procedure.
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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
5.
| caution |
When checking the belt tension, turn the crankshaft clockwise
one turn or more.
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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.
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