DRIVE BELT AUTO-TENSIONER CHECK



OPERATION CHECK


1.Stop the engine from the idle state.
2.Check that the drive belt are not protruding from the pulley width of drive belt auto-tensioner.
3.Remove the drive belt (Refer to ).

4.
warning Be sure to set the tool to the hexagonal part securely to prevent the tool from falling off because the tension of the auto-tensioner is high.
Securely set the tool to the hexagonal part of the auto-tensioner.
5.Check that no binding is present by turning the auto-tensioner in the left and right directions.
6.If there are any problems in the procedure 2 or 5, replace the drive belt auto-tensioner (Refer to GROUP 11D - Alternator and Ignition System ).
7.Install the drive belt (Refer to ).

FUNCTION CHECK


The drive belt 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 tension of the drive belt (Refer to ).

2.Connect special tool microphone assembly (MB992082) to special tool belt tension meter (MB992081) of special tool belt tension meter set (MB992080).
3.Press the "POWER" button to turn on the power supply.
4.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
note 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.
<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.
5.Press "Hz" button twice to change the display to the frequency display (Hz).

6.
caution
  • When measuring, make sure that the engine is cold.
  • Measure after turning the crankshaft clockwise one turn or more.
  • 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.
Hold special tool MB992080 to the middle of the drive belt between the pulleys (at the place indicated by arrow) where it does not contact the drive belt (approximately 10 - 15 mm away from the rear surface of the belt) so that it is perpendicular to the drive belt (within an angle of ± 15°).
7.Press the "MEASURE" button.
8.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.
9.Check that the vibration frequency of the drive belt is within the standard value.
Standard value (Reference): 115 - 156 Hz
note To take the measurement repeatedly, fillip the drive belt again.
10.After the completion of the measurement, press and hold the "POWER" button to turn off the power supply.
11.If not within the standard value, replace the drive belt auto-tensioner (Refer to GROUP 11D - Alternator and Ignition System ).

<When tension is measured>


1.Check the tension of the drive belt (Refer to ).

2.
caution
  • When measuring, make sure that the engine is cold.
  • Measure after turning the crankshaft clockwise one turn or more.
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): 234 - 421 N
3.If not within the standard value, replace the drive belt auto-tensioner (Refer to GROUP 11D - Alternator and Ignition System ).