Drive Belt: Testing and Inspection
DRIVE BELT (FOR GENERATOR, POWER STEERING OIL PUMP AND A/C COMPRESSOR) (CHECK CONDITION)Generator Drive Belt Tension Check
Required Special Tools:
- MB991502: Scan Tool (MUT-II)
- MB991668: Belt Tension Meter Set
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect special tool MB991668 to scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector.
3. Turn the ignition switch to the "ON" position and select scan tool MB991502 "Belt Tension Measurement" from the menu screen.
4. Hold special tool MB991668 (microphone) near the center of the drive belt between the pulleys (at the place indicated by the arrow), about 10 - 20 mm (0.4 - 0.8 inch) away from the rear surface of the belt and perpendicular to the belt (within an angle of ± 15 degree angle).
CAUTION:
- The temperature of the surface of the belt should be as close as possible to underhood temperature.
- 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.
Standard Value:
5. 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:
Use a belt tension gauge to check that the belt tension is within the standard value.
Standard Value:
Apply approximately 100 N (22 pound) 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.
Generator Drive Belt Tension Adjustment
1. Loosen the nut of the generator pivot bolt.
2. Loosen the lock bolt.
Standard Value:
3. Turn the adjusting bolt to adjust the belt vibration frequency, belt tension or deflection to the standard value.
CAUTION: Check after turning the crankshaft one or more rotations clockwise.
4. Tighten the lock bolt.
Tightening torque: 23 ± 2 N.m (16 ± 2 ft-lb)
5. Tighten the nut of the generator pivot bolt.
Tightening torque: 44 ± 10 N.m (33 ± 7 ft-lb)
6. Tighten the adjusting bolt.
Tightening torque: 5.0 ± 1.0 N.m (44 ± 8 in-lb)
Power Steering Oil Pump and A/C Compressor Drive Belt Tension Check and Adjustment
Check the drive belt tension by the following procedure.
Required Special Tools:
- MB991502: Scan Tool (MUT-II)
- MB991668: Belt Tension Meter Set
Gently tap the middle of the belt between the pulleys (the location 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: Refer to for details on the method of measuring the vibration frequency using the scan tool.
Use a belt tension gauge to check that the belt tension is within the standard value.
Apply approximately 100 N (22 pound) 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:
If the tension or deflection is outside the standard value, adjust by the following procedure.
1. Loosen the tension pulley fixing nut A behind the tension pulley.
2. Adjust the belt deflection amount using the adjusting bolt B.
3. Tighten the fixing nut A.
Tightening torque: 26 ± 4 N.m (19 ± 3 ft-lb)
CAUTION: Check after turning the crankshaft one or more rotations clockwise.
4. Check the belt deflection amount and tension, and readjust if necessary.