POWER STEERING OIL PUMP DRIVE BELT TENSION CHECK AND ADJUSTMENT


POWER STEERING OIL PUMP DRIVE BELT TENSION CHECK

<WHEN THE VIBRATION FREQUENCY IS MEASURED: RECOMMENDATION>

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 judgment 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.
4.Press "Hz" button twice to change the display to the frequency display (Hz).

5.
caution
  • The temperature of the surface of the belt should be as close to normal temperature as possible.
  • 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 the special tool (MB992080) to the middle of the power steering oil pump drive belt between the pulleys (at the place indicated by arrow), approximately 10 - 15 mm away from the rear surface of the power steering oil pump drive belt so that it is perpendicular to the power steering oil pump drive belt (within an angle of ± 15 degrees).
6.Press the "MEASURE" button.
7.Gently tap the middle of the power steering oil pump 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 power steering oil pump drive belt is within the standard value.
Standard value: 128 - 165 Hz
note To take the measurement repeatedly, fillip the power steering oil pump drive belt again.
8.After the completion of the measurement, press and hold the "POWER" button to turn off the power supply.

<WHEN THE TENSION IS MEASURED>

Use a belt tension gauge in the middle of the power steering oil pump drive belt between the pulleys shown in the figure (at the place indicated by the arrow) to check that the power steering oil pump drive belt tension is within the standard value.
Standard value: 294 - 490 N

<WHEN THE DEFLECTION IS MEASURED>

Apply approximately 100 N of force to the middle of the power steering oil pump drive belt between the pulleys (at the place indicated by the arrow) and check that the amount of deflection is within the standard value.
Standard value (Reference): 11.9 - 15.6 mm

POWER STEERING OIL PUMP DRIVE BELT TENSION ADJUSTMENT
If the tension or deflection is outside the standard value, adjust by the following procedure.

1.Loosen the tensioner pulley lock nut.
2.Adjust the belt tension to the standard value by turning the adjusting bolt. The tension will increase when turning the adjusting bolt clockwise, and decrease when turning anti-clockwise.
Standard value:
Item
 When adjusted
 When replaced
Vibration frequency Hz
 138 - 157
 165- 196
Tension N
 343 - 441
 490 - 686
Deflection (Reference) mm
 12.7 - 14.6
9.2 - 11.9
3.Tighten the lock nut to the specified torque.
Tightening torque: 47 ± 11 N·m
4.
caution Check after turning the crankshaft one or more rotations clockwise.
Check the power steering oil pump drive belt deflection amount and tension, and readjust if necessary.
5.When the power steering oil pump drive belt tension is adjusted by measuring the belt deflection, adjust it with a tool for vibration frequency measurement or tension measurement afterward.