MIVEC
GENERATOR DRIVE BELT TENSION CHECKRequired Special Tools:
^ MB992080: Belt tension meter set
^ MB992081: Belt tension meter
^ MB992082: Microphone assembly
NOTE: The vibration frequency measuring method is recommended for check and adjustment of the drive belt tension.
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.
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.
4. Press "Hz" button twice to change the display to the frequency display (Hz).
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.
5. 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
Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991910: M.U.T.-III Main Harness A
^ MB991668: Belt Tension Meter Set
NOTE: The vibration frequency measuring method is recommended for check and adjustment of the drive belt tension.
CAUTION: To prevent damage to special tool MB991824, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting special tool MB991824.
1. Connect special tool MB991668 to special tool MB991824.
2. Connect special tool MB991910 to special tool MB991824.
3. Connect scan tool MB991910 to the data link connector.
4. Turn the ignition switch to the "ON" position and select "Belt Tension" from the menu special tool MB991824 screen.
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.
5. Hold special tool MB991668 (microphone) to the middle 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 so that it is perpendicular to the belt (within an angle of ± 15 degree angle).
6. 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: 143 - 169 Hz
Use a belt tension gauge to check that the belt tension is within the standard value.
Standard value: 490 - 686 N (110 - 154 lb)
Apply approximately 98 N (22 lb) 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 in)
GENERATOR DRIVE BELT TENSION ADJUSTMENT
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:
Standard value:
3. Tighten the tension pulley fixing nut.
Tightening torque: 49 ± 10 Nm (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.