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17.6. Check of a condition of tires and pressure in them

Weekly or through each 400 km of a run (that will come earlier)

Regular check of a condition of tires will allow you to avoid the troubles connected with stops in way because of the lowered wheel. Besides, such checks give valuable information on possible problems with steering and a suspension bracket before emergence in them serious damages.

Tires are equipped with the built-in strips of indication of wear of a protector which are bared at decrease in depth of a protector to 1.6 mm then tires are considered as worn-out. This size represents minimum admissible depth of a protector; it is in most cases recommended to replace the tire which depth of a protector of 2 mm and less. Depth of a protector can also be determined by the simple and inexpensive adaptation known under the name of the measuring instrument of depth of a protector.

Pay attention to any unusual wear of protectors. Such defects of a protector as cavities, cambers, flattening and stronger wear on the one hand indicate violation of angles of installation of forward wheels and/or balancing of a wheel. At identification any of the listed defects it is necessary to address for their adjustment in a tire workshop.

Carefully check the tire for existence of cuts, punctures and the got stuck nails or buttons. Sometimes after piercing of the tire a nail it still some time holds pressure or lowers very slowly.
At suspicion at first check tightness of the nipple of the gate of a rating for existence of such "slow puncture". Then examine a protector on presence at it of the got stuck foreign objects or punctures which are closed up earlier which started over again passing air. If there is a suspicion that there is a puncture, it is possible to make sure of its existence, having moistened the suspected site with soap water. In the presence of leak solution will begin to bubble. If a puncture not too big, the tire it is usually possible to repair in any tire workshop.

Carefully examine the internal side surfaces of tires on existence of signs of leak of brake fluid on them. If those are available, immediately check the brake system.

Maintenance in tires of the correct pressure increases the term of their service, helps to save fuel and improves the general quality of driving. The special manometer is necessary for check of pressure.

Always you keep the exact manometer in the ware box. Indications of the manometers which are built in nozzles of air hoses at stations of service often happen inexact.

Always check pressure on cold tires (i.e. to a trip on the car). If to check pressure on the warm or warmed tires, it will lead to overestimate of indications of the manometer because of thermal expansion of tires. In this case it is never necessary to lower pressure since after cooling of the tire it will appear below norm.

Screw together a protective cap from the gate of a rating acting from a disk of a wheel or from a nave cap then densely press a manometer nozzle to the gate. Consider instrument readings and compare them with recommended in the Size table and adjusting data at the end of the Management. To prolong service life of tires, check pressure in them at least once a week by means of the exact measuring instrument (do not forget about a spare wheel!). Do not forget to install into place a protective cap for prevention of hit in the mechanism of the nipple of dirt and moisture. Check pressure in all four tires and if necessary pump up them to the recommended value of pressure.

Do not forget to support the required pressure and in a spare wheel.

Examples of characteristic wear of protectors of tires

Side wear

Insufficient pressure (wear on both sides)

Insufficient pressure in the tire leads to its overheat at the movement owing to an excessive deflection therefore the protector does not nestle sufficiently on the surface of the road. It leads to loss of coupling with the road and to excessive wear of a protector, not to mention danger of an exit of the tire out of operation as a result of an overheat.

Check and adjust pressure.

Wrong disorder of wheels (wear on the one hand)

Repair or replace suspension bracket details.

Too sharp turns

Reduce speed!

Central wear

Excessive pressure

Excessive pressure in the tire results in the accelerated wear of the central part of a protector, decrease in coupling with the road, more rigid movement and increase of danger of damage of a slope.

Check and adjust pressure.

If you had to pump up tires for transportation of heavy freights to specified for this purpose in the Size table and adjusting data at the end of the Management of value of pressure, do not forget to pit after that it upon transition to the normal mode of operation.

Uneven wear

Tires of forward wheels can unevenly wear out as a result of violation of adjustment of angles of installation of wheels. It is possible to check and adjust the angles of installation for a moderate payment in the majority of tire workshops.

Wrong disorder or выбег

Repair or replace suspension bracket details.

Defect of a suspension bracket

Repair or replace suspension bracket details.

Wheels are debalanced

Make balancing of wheels.

Convergence of forward wheels is incorrectly established

Adjust the angles of installation of forward wheels.

The Obtrepannost of edges of a pattern of a protector which is a wear sign best of all comes to light to the touch.