AUTO-TENSIONER CHECK


OPERATION CHECK
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 auto-tensioner.
2.Remove the drive belt (Refer to ).

3.Install the tool to the auto-tensioner, and check that no binding is present by turning the auto-tensioner in the left and right directions.
4.If there are any problems in the procedure 1 or 3, replace the auto-tensioner (Refer to ).
5.Install the drive belt (Refer to ).

FUNCTION CHECK
caution
  • When checking the drive belt tension, make sure that the engine is cold.
  • Check the drive belt tension after turning the crankshaft clockwise one turn or more.
The auto-tensioner can be checked whether it is in good condition by checking its tension.

<When the vibration frequency is measured: Recommendation>
1.Check the drive belt tension (Refer to ).


2.Measure the drive 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) Check how the belt tension meter is set.
(4) Press "Hz" button twice to change the display to the frequency display (Hz).
(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.
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.
Standard value (Reference): 107 - 151 Hz
note To take the measurement repeatedly, fillip the belt again.
3.If not within the standard value, replace the auto-tensioner (Refer to ).

<When tension is measured>
1.Check the drive belt tension (Refer to ).

2.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.
Standard value (Reference): 196 - 392 N
3.If not within the standard value, replace the auto-tensioner (Refer to ).