3.1.5. Check of a state and pressure of a rating of tires
It is extremely important to support constantly tires in good repair and pumped up with due pressure symbol - a wheel exit out of operation during the movement (at any speed) is extremely dangerous. Speed of wear of protectors of tires first of all is defined by a driving manner - frequent sharp braking and accelerations, commission of turns without reduction of speed, etc. factors considerably promote reduction of service life of tires. As a rule, protectors of forward wheels wear out slightly earlier back therefore timely performance of rotation of wheels of the car allows to achieve more uniform wear of tires and, as a result, extension of term of their service. It is necessary to notice, however, that at uniform wear of protectors the owner of the car faces need of performance of single replacement of four wheels at once that not to each motorist can appear on a pocket. In this case it is better to neglect rotation of wheels and to make replacement of tires in pairs, rassosredotochivy thereby material inputs.
Regularly examine protectors of all wheels of the car, taking the small stones which got stuck in them, nails and other foreign objects from profile flutes of a protector before they cause a wheel puncture. If at extraction nailing the wheel puncture fact is elicited, insert a nail back into the opening punctured with it, having marked with that defect, then change a wheel and deliver failed in a tire workshop for repair.
Pay also attention to such defects as cracks, cuts, swellings ("egg"), etc. which are most often formed on the side surface of the tire. Regularly remove wheels for careful cleaning of disks of dirt as with external, and from the inside. Check rims of disks for existence of traces of development of corrosion, deformations and other damages. Remember that the disks made of light alloy easily fail at arrivals on curbs and deep defects of a covering. Stamped disks in such situations usually are only deformed and can be restored by hire on the special machine which is available practically in any tire workshop. In case of strong damages disks are not subject to restoration, and their replacement becomes the only alternative.
Every time when replacing tires of a wheel are subject to balancing assembled. Need for repeated balancing of wheels can arise in the course of wear of protectors, and also in case of loss of counterbalances. Violation of balancing of wheels leads to reduction of service life of protectors due to acceleration of their wear, besides, during the movement vibration load of components of a suspension bracket and steering considerably increases. The first sign of violation of balancing of wheels is emergence of the noticeable vibrations especially noticeable at certain speeds of the movement (usually around 80 km/h [50 miles/h]). If vibration is transferred mainly to a steering wheel, therefore, violation of balancing only of forward wheels takes place. At body vibration it is necessary to balance all wheels of the car. Balancing of wheels has to be made in the conditions of a tire workshop.
Visual check of degree of wear of a protector
The Citroyon Xantia brands of a wheel which are included in a basic equipment of cars are usually equipped with the built-in indicators of wear of protectors.
Measurement of residual depth of a protector manually
Check of pressure of a rating of tires
Typical examples of wear of protectors
Humeral wear
Uniform humeral wear of a protector (identical from both of its parties) usually is defined by an excessive deflection of the tire as a result of too weak pressure of its rating and is followed by decrease in coupling with a paving and reduction of service life of a wheel, not to mention the increased danger of a rupture of the tire during the movement. Check and modify pressure of a rating of tires.
Unilateral humeral wear of a protector is most often connected with violation of angles of installation of a wheel. It is necessary to check immediately geometrical parameters of a suspension bracket and to make the corresponding corrections.
One more of the reasons of humeral wear of a protector is too sharp manner of driving - reduce speed on turns!
Central wear
Excessive pressure of a rating of the tire leads to more dense contact with a paving of the central part of a protector that leads to the accelerated operation of the last. Among by-effects it should be noted decrease in coupling of a wheel with a paving, increase in rigidity of the course of the car, not to mention increase in risk of an unexpected rupture of the tire. Check and modify pressure of a rating of tires.
Sometimes temporary increase in pressure in tires is necessary as, for example, in cases of transportation of heavy freights, at long driving with high speeds, etc. Do not forget to dump pressure in tires to normal at return to usual service conditions of the car.
Uneven wear
Uneven wear of protectors of tires of forward wheels can be connected with violation of angles of installation of the last. It is possible to check and modify geometry of a forward suspension bracket of the car for rather small payment practically in any tire workshop.
At violation of disorder or vybeg of wheels it is necessary to make necessary repair or replacement of the failed suspension bracket components.
Do not forget to check and to properly modify balancing of wheels.
At violation of convergence of wheels it is necessary to make the corresponding adjustments also.
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Scaly wear of a protector by which violation of convergence of wheels usually is followed the easiest is defined to the touch. |