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 >
Required Special Tools
- MB992080: Belt Tension Meter Set MB992081: Belt Tension Meter MB992082: Microphone Assembly
Scheme 11
Scheme 12
- Check the tension of the drive belt (Refer to «DRIVE BELT TENSION CHECK»(ref-593001-S12422720122014011300000) ).
- Check the tension of the drive belt in the following procedures. Connect special tool MB992082 to special tool MB992081 of special tool MB992080. Press the "POWER" button to turn on the power supply. 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 judgement of error. < Setting procedure > Press down the "MASS" button till the belt mass select display appears. 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. Press the "WIDTH" button to change to the belt width input display. 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. Press the "SPAN" button to change to the span length input display. 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. Press "Hz" button twice to change the display to the frequency display (Hz.) CAUTION: When measuring, make sure that the engine is cold. Measure after turning the crankshaft clockwise one turn or more. 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 belt between the pulleys (at the place indicated by arrow) where it does not contact the belt [approximately 10 - 15 mm (0.4 - 0.6 inch) away from the rear surface of the belt] so that it is perpendicular to the belt (within an angle of ± 15 degrees angle). Press the "MEASURE" button. Gently tap the middle of the belt between the pulleys (the place indicated by the arrow in the illustration) with your finger as shown in the illustration, and check that the vibration frequency of the belt is within the standard value. Standard value: 115 - 156 Hz NOTE: To take the measurement repeatedly, tap the belt again. Press and hold the "POWER" button to turn off the power supply.
- If not within the standard value, replace the drive belt auto-tensioner (Refer to «REMOVAL AND INSTALLATION»(ref-593001-S24287861212014011300000) ).
< When using a tension gauge >
Scheme 13
- Check the tension of the drive belt (Refer to «DRIVE BELT TENSION CHECK»(ref-593001-S12422720122014011300000) ). 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 belt between the pulleys shown in the illustration (at the place indicated by the arrow in the illustration) to check that the belt tension is within the standard value. Standard value: 265 - 440 N (52.7 - 94.6 pounds)
- If not within the standard value, replace the drive belt auto-tensioner (Refer to «REMOVAL AND INSTALLATION»(ref-593001-S24287861212014011300000) ).