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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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222.5 - 251.0
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222.5 - 251.0
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259.8 - 300.0
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Tension N
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363 - 462
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363 - 462
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495 - 660
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Deflection mm (Reference)
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6.8 - 8.0
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6.8 - 8.0
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5.1 - 6.4
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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.
| 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).
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5.
| caution |
- The temperature of the
surface of the belt should be as close to normal temperature as possible.
- 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 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 special tool MB992080 to the middle of the belt between the pulleys (at the place
indicated by arrow) where it does not contact the belt (approximately 10 - 15 mm away from
the rear surface of the belt) 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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Use a belt tension gauge in the middle of the belt between the pulleys shown in the figure
(at the place indicated by the arrow) to check that the belt tension is within the standard
value.
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Apply approximately 100 N of pressure against the location between the pulleys shown by
the arrow in the illustration and then measure the deflection.
When the belt tension is adjusted by measuring the belt deflection, adjust it with a tool
for vibration frequency measurement or tension measurement afterward.
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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.
4.Tighten the adjusting bolt.
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.
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