4.2.2. Accuracy of balancing of wheels
This section contains councils and a technique of carrying out exact balancing of wheels. Vibration of a steering wheel and/or concussion of a body testify that was not given to some operations of sufficient attention.
For the correct performance of balancing, the wheel should be assembled correctly fixed at the stand. One of important conditions of the correct installation, wheel installation on the center of a shaft of the balancing stand is.
Balancing stands of the wheels removed from the car should be calibrated periodically for the purpose of receiving exact results when balancing wheels.
Badly otkalibrovanny balancing stand can cause unnecessary replacement of tires, shock-absorbers, suspension bracket or steering elements.
Carry out calibration of the balancing stand through each 100 balancing of wheels.
In the Operation manual on the balancing stand operations on its calibration should be described. If operations on calibration of your balancing stand are not available, use the general representations described in this section, at calibration of zero, static and dynes – chesky balancing. This block diagram also contains operations on check of calibration of the balancing stand.
Technique (councils at carrying out balancing)
Be convinced of absence of pollution and rusts on a cone of the balancing stand and an assembly cone of a wheel.
On this car the central opening of a wheel from a nave has a facet.
In this case it is necessary to use a return cone at the balancing stand for a centering of a checked wheel on a stand shaft.
Establish an assembly cone of a wheel. Acceptable diameter of a cone for a wheel of this car of 67,0 mm.
Prior to the beginning of carrying out balancing, remove from a wheel everything грузики (from both parties). Check also from two parties a wheel and tire condition.
At installation грузиков, nail them with the blows put at right angle.
Confirmation of correctly executed balancing of a wheel
Upon termination of wheel balancing, weaken a nut lamb and turn a wheel on 180 ° concerning a nave of the balancing stand. Again tighten a nut lamb and again check wheel balancing. If necessary, repeat operations of balancing of a wheel.
Turn a wheel for 180 ° concerning a nave of the balancing stand.
If each time a wheel has an imbalance at its subsequent turn concerning a stand nave, most likely, the balancing stand demands calibration.
Check of calibration of the balancing stand
Establish the intact wheel with the tire assembled on the balancing stand. Otbalansiruyte wheel.
Check zero calibration. Weaken a stand nut lamb, turn a wheel on a half of turn (180 °), again tighten a nut lamb.
Check wheel balancing. If the imbalance does not exceed 5 g, zero calibration in norm. Repeatedly отбалансируйте a wheel also pass to a stage 4 for check of static balancing. If the imbalance exceeds 5 g, pass to the following stage.
Weaken a stand nut lamb, turn a wheel on a turn quarter (90 °), again zatyany a nut lamb. Check wheel balancing. If the imbalance does not exceed 5 g, maybe, the wheel is not centered at the stand, or adjusting a cone, the cup and/or a nut lamb have damages or are polluted or do not approach to this wheel. It can be necessary to address to "Operation manual" on the balancing stand to specify rules of installation of wheels at the stand. Upon termination of necessary amendments, again check wheel balancing. If everything is all right, pass to the following stage.
If the imbalance exceeds 5 g, the balancing stand needs calibration. Contact the producer of the balancing stand due to the need of stand calibration by their representatives.
Check of static balancing
Attach грузик in 5 g to an external board of a rim of a wheel. Check wheel balancing. The balancing stand should find 5 ±2 g an imbalance from 170 to 190 ° from it 5 gram грузика.
If an imbalance within norm, calibration of static balancing as it should be. Pass to the following stage of check of dynamic balancing.
If the imbalance exceeds norm, the balancing stand needs calibration. Contact the producer of the balancing stand due to the need of stand calibration by their representatives.
Check of dynamic balancing
Attach грузик in 5 g to an internal board of a rim at an angle 180 ° in relation to грузику in 5 g which was attached at a pregoing stage. Again check an imbalance. The balancing stand should find 5 ±2 g an imbalance from 170 to 190 ° both from internal, and from external to 5 gram грузика. If an imbalance within norm, calibration of dynamic balancing as it should be. Check of calibration of the balancing stand is finished. If the imbalance exceeds norm, the balancing stand needs calibration. Contact the producer of the balancing stand due to the need of stand calibration by their representatives.
Pressure check in tires
Value of nominal pressure in tires is designated on a label on an average lateral rack from the driver.
Check of wear of tires
Depth of drawing of a protector of the tire: at least 1,6 mm.
If depth of drawing of a protector of the tire less admissible limit, replace the tire.
When depth of drawing of a protector of the tire becomes less than 1,6 mm, on the tire there is a wear indicator.
Check of palpation of tires
Lift the car so that its wheel did not concern a floor. Slowly rotating a hand a wheel, measure by means of the indicator of hour type wheel palpation.
If the size of palpation of a wheel surpasses limiting value, replace a wheel.
Operations on installation of details
Tighten nuts of fastening of a wheel the nominal moment.
Nominal moment of an inhaling: 98 ±10 N · m.