Drive Belt Tension and Deflection Check
DRIVE BELTS (FOR THE GENERATOR AND POWER STEERING PUMP) (CHECK)
DRIVE BELT TENSION CHECK [2.4L ENGINE]
1.
CAUTION:
Check the drive belt tension after turning the crankshaft clockwise one turn or more.
Make sure that the indicator mark is within the area marked with A in the illustration.
2. If the mark is out of the area, replace the drive belt. Service and Repair).
NOTE:
The drive belt tension adjustment is not necessary as auto-tensioner is adopted.
GENERATOR DRIVE BELT TENSION CHECK [3.8L ENGINE]
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.
[WHEN USING SPECIAL TOOL MB992080: RECOMMENDATION]
Required Special Tools:
- MB992080: Belt tension meter set
- MB992081: Belt tension meter
- MB992082: Microphone assembly
1. Connect the special tool MB992082 to the special tool MB992081 of the Special tool 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 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:
- 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 drive belt between the pulleys (at the place indicated by arrow), approximately 10 - 15 mm (0.4 - 0.59 inch) away from the rear surface of the belt so that it is perpendicular to the belt (within an angle of ± 15 degree).
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 measure that the vibration frequency of the belt is within the standard value.
Standard value: 143 - 169 Hz
[WHEN USING THE TENSION GAUGE]
Use a belt tension gauge to check that the belt tension is within the standard value.
Standard value: 490 - 686 N (110 - 154 pounds)
[BELT DEFLECTION CHECK]
Apply approximately 100 N (22 pounds) 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 in within the standard value.
Standard value: 8.4 - 10.7 mm (0.33 - 0.42 inch)
GENERATOR DRIVE BELT TENSION ADJUSTMENT [3.8L ENGINE]
If the vibration frequency, tension or deflection is outside the standard value, adjust by the following procedure.
1. Loosen the tensioner pulley fixing nut.
2. With the tensioner pulley fixing nut temporarily tightened to 15 ± 5 Nm (11 ± 4 ft-lb), set the belt tension or defection amount to the standard value using the adjusting bolt.
Standard value:
3. Tighten the tension pulley fixing nut.
Tightening torque: 49± 10Nm (36± 7 ft-lb)
4. When the belt tension is adjusted by measuring the belt deflection, adjust it with a tool for vibration frequency measurement or tension measurement afterward.
POWER STEERING DRIVE BELT TENSION CHECK [3.8L ENGINE]
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.
[WHEN USING SPECIAL TOOL MB992080: RECOMMENDATION]
Required Special Tools:
- MB992080: Belt tension meter set
- MB992081: Belt tension meter
- MB992082: Microphone assembly
With your finger tip lightly tap the center of the drive belt between the pulleys in the location shown by the arrow in the illustration and then measure the belt vibration frequency.
Standard value: 124 - 160 Hz
NOTE:
Refer to generator drive belt tension check, for information regarding the vibration frequency measurement method using the special tool MB992080.
[WHEN USING A TENSION GAUGE]
Use a belt tension gauge to check that the belt tension is within the standard value.
Standard value: 294 - 490 N (66 - 110 pounds)
[BELT DEFLECTION CHECK]
Apply approximately 100 N (22 pounds) 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.
Standard value: 12.3 - 16.2 mm (0.48 - 0.64 inch)
POWER STEERING DRIVE BELT TENSION ADJUSTMENT [3.8L ENGINE]
If the vibration frequency, 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 counterclockwise.
Standard value:
3. Tighten the lock nut to the specified torque.
Tightening torque: 49± 9Nm (36± 7 ft-lb)
4. Tighten the adjusting bolt.
Tightening torque: 5.0± 1.0Nm (44± 9 in-lb)
5.
CAUTION:
Check after turning the crankshaft one or more rotations clockwise.
Check the belt vibration frequency, tension or deflection amount, and readjust if necessary.
6. When the belt tension is adjusted by measuring the belt deflection, adjust it with a tool for vibration frequency measurement or tension measurement afterward.