4.1.14. Balancing

Before starting balancing the following conditions have to be satisfied.
Air pressure in the tire has to be normal.
The drawing of a protector should not have unilateral wear, and its depth has to make not less than 4 mm.
The tire should have no damages, like cuts, punctures, foreign objects, etc.
The wheel suspension bracket, steering, steering drafts, including shock-absorbers, have to be in a faultless state.

Trial trip before balancing
If on the authorized station the car with the complaint to "not smoothness of the course" arrives, then before balancing surely follows execute a trial trip.
In the movement it is necessary to establish at what speed the imbalance appears.
At once after a trial trip lift the car on the elevator.
Mark the place of its installation on each tire.
Dismantle and balance wheels.

Balancing at the stationary balancing stand
Clamp a wheel at the balancing stand

NOTE
It is necessary to remember. when balancing wheels, as well as at any other repair, the most important rule is purity. Only watching purity, it is possible to achieve faultless result.
Dirt and rust in the field of a prileganiye and a centering opening of a wheel distort result.

Before install a wheel on the balancing stand, clear a prileganiye surface, a centering opening and a disk.
Install a wheel with the tire on the balancing stand.

Fig. 4.13. Collet adapter



NOTE
For an inhaling of a wheel use, for example, the collet self-unclenched adapter for balancing VAS 5271 stands (fig. 4.13).

At its use 100% centering of a wheel and a careful clip of a disk are guaranteed.
Conic adapters for centering do not provide 100% of centering of a wheel at the stand.
At a deviation from the center on 0,1 mm on a wheel and the tire the imbalance in 10 g appears.

Order of works when balancing the wheel/tire
Scroll a wheel with the tire at the balancing stand.
Check the course of marking strips on tire sidewalls in the field of an onboard zakraina.
Check the drawing of a protector at the rotating wheel.

NOTE
At unilateral wear, wear spots because of braking with the blocked wheels or strong uneven wear balancing will not possible to reach smoothness of the course. In this case it is necessary to replace the tire.

Check the accuracy of rotation of a wheel with the tire. If the wheel with the tire rotates unevenly though there is no flattening of the tire, the radial and side beating can be the cause of it.
Check a disk with the tire for existence of a radial and side beating.
If a radial and side beating are in admission limits, balance a wheel with the tire.

NOTE
Do not use more than 60 g of weight on a wheel.
If more small weights are necessary, then if necessary it is possible to reach good balancing due to minimization.

Minimization
On the display of the balancing stand 0 g have to be displayed.
As an alternative it is possible for minimization use the balancing VAS 6230 stand.
Fasten a wheel to a nave.
At first tighten the lowermost wheel bolt with the moment about 30 N · m.
Then tighten other bolts also on 30 N · m cross-wise. At the expense of it the wheel is centered on a nave.
Lower the car on wheels.
Now tighten wheel bolts cross-wise by means of a dynamometer key for the ordered inhaling moment.
After balancing of wheels execute a trial trip.
If at a trial trip nevertheless the beating is felt, then the balancing error because of centering of a wheel can be its cause.
Errors of centering of wheels and naves in adverse cases can be imposed at each other. For this reason the beating is also possible. It can be eliminated by means of the stand for finishing balancing.

Balancing control VAS 6230 stand

Fig. 4.14. Balancing stand


By means of the balancing control VAS 6230 stand, besides the known static balancing, it is possible to perform additional functions (fig. 4.14).
Feature of this system is check of radial effort of a wheel with the tire during rotation.
During this check on a wheel presses a roller with effort about 635 kg. Thus, force operating on a basic surface of a wheel from the surface of the road to time of the movement is imitated.
Because of a radial and side beating in a wheel and the tire and various rigidity in force tire. acting on the area of contact of the tire with the road change.
The VAS 6230 system distinguishes and remembers position of the maximum measured radial effort in the tire. By means of it the provision of the smallest distance between onboard zakrainy rims and the center of a disk is measured.