Examination
Check the alternator drive belt tension as follows:
Generator drive belt tension:
- oscillation frequency: 150-184Hz
- tension: 392-588 N
- deflection (set value): 8.7-11.4mm
Using the MUT-II
Warning. Switch off the ignition before connecting or disconnecting the MUT-II.
1. Connect the special tool to the MUT-II (microphone).
2. Connect the MUT-II to the diagnostic socket.
3. Turn the key in the ignition switch to the ON position (ON) and select the function from the main menu «Belt tension measurement» (Measuring drive belt tension.).
4. Position the microphone in the center of the belt leg between the pulleys at the location indicated by the arrow in Figure 3.1, perpendicular to the belt surface (at an angle of±15°) at a distance approximately equal to 10-20 mm from the rear surface of the belt.
5. Gently press the belt between the pulleys by hand at the point indicated by the arrow in figure 3.1, and check that the frequency of the belt oscillations corresponds to the nominal value.
Pic. 3.1. The location of the microphone when checking the tension of the drive belt of mounted units
Warnings
- (1) Belt surface temperature should be as close to normal temperature as possible.
- (2) Do not allow foreign particles such as water or oil to enter the microphone.
- (3) The measurement result will not correspond to the actual value if the microphone is affected by strong gusts of wind or nearby noise sources.
- (4) When measuring, do not allow the strap to touch the microphone, otherwise the measurement result will not correspond to the actual value.
- (5) Do not measure with a vehicle running.
Without using the MUT-II
With a special tool for measuring belt tension, check that the tension is correct (pic. 3.2).
Pic. 3.2. Place for measuring the tension of the alternator drive belt
By deflection of the belt
Apply a force of approximately 98 N to the center of the belt run between the pulleys at the point indicated by the arrow in Figure 3.3 and check that the deflection is within the nominal value.
Pic. 3.3. Place for measuring the application of force when checking the tension of the alternator drive belt
Alternator Drive Belt Tension Adjustment
1. Loosen the alternator pivot bolt nut (pic. 3.4).
Pic. 3.4. Arrangement of bolts of fastening of the generator
2. Loosen the blocking bolt.
3. Turn the adjusting bolt to adjust the belt tension.
Generator drive poly V-belt tension:
- when installing a used belt:
- oscillation frequency: 159-176Hz
- tension: 441-539 N
- deflection (set value): 9.2-10.6 mm
- when installing a new belt:
- oscillation frequency: 191-218Hz
- tension: 637-833 N
- deflection (set value): 6.6-8.3 mm
4. Tighten a nut of a hinge bolt of fastening of the generator the demanded moment.
Tightening torque: 44 Nm
5. Tighten the blocking bolt of fastening of the generator the demanded moment.
Tightening torque: 23 Nm
6. Tighten the adjusting bolt to the required torque.
Tightening torque: 5 Nm