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Checking the condition of tires and pressure in them, the designation of tires and wheel rims, wheel rotation

Depending on the model and equipment can be installed tires and wheels of different sizes. Wheel bolts for steel and alloy wheels are the same size.

When installing the production of alloy wheels Mercedes-Benz not be required bolts of other sizes.

If any discrepancies between the tire inflation pressure values specified in the Specifications on the nameplate fixed on the inside cover flap fuel filler defining should be considered last.

At a sports manner of driving it is recommended to increase the pressure in the front and rear tires about 0.2 kgf / ^cm 2, based on the basic values for the various loading conditions.

Snow tires tend to have inflation pressure of 0.2 kgf / ^cm 2 higher than the summer - pay attention to the recommendations of manufacturers of winter tires.

Do not forget that the use of winter tires is usually imposes restrictions on the movement speed modes.

Legend drives

Example 7s J x 16 H2 ET63

7s - The width of the disc in inches

J - Letter designation of height and contour disk rim flange

x - Designation whole deep drive

16 - Disc diameter in inches

Permissible lateral runout on the outboard rim disk: 0.8 mm;

Permissible radial runout on the landing shelf disk: 0.5 mm.

Designation of tires

Example: 205/70 R 16 112 H

195 - tire width in mm

/ 70 - ratio of height to width (height of the cross section of the tire is 70% of the width)

If individual information on the ratio of width to height are absent (for example, 205 R 16), then it is a "normal" relations, is 82%.

R - Radial construction

16 - Disk Size in inches

112 - Setting-duty

H - Designation permissible maximum speed.

Symbols of speed concern as to the summer and snow tires. The letters indicate the speed listed in the Specifications.

The additional symbol M + S indicates that the tire tread has a standard design.

Date of manufacture tires

The date of manufacture to be indicated on the tire manufacturer's code

Example: DOT CUL2 UM8 019 TUBELESS

DOT - Department of Transportation (US Department of Transportation)

CU - abbreviation manufacturer

L2 - the tire size

UM8 - performance of the tire

4600 - date of manufacture - the 46th working week of 2000

TUBELESS - tubeless (TUBETYPE - bus with the camera)

Regular carrying Bus Health Test to avoid troubles connected with stops along the way because of a flat tire. In addition, such tests provide valuable information about possible problems with steering and suspension long before the emergence of more serious symptoms.

The depth of the tread pattern

Indicators of wear of the tire tread to a depth of 1.6 mm are places marked on the sidewall of the letters TWI

Tires have built-tread wear indicator bars, which are exposed at lower tread depth to 1.6 mm, after which the tire is worn out. This value represents the minimum allowable tread depth; in most cases it is recommended to replace the tire tread depth is 2 mm or less. Tread depth can also be determined by a simple and inexpensive device, known as a tread depth gauge.

Pay attention to any unusual deterioration of protectors. Such defects protector as cavities, convexity flattening and stronger deterioration on the one hand indicate the violation of the angles of the front wheels and / or wheel balancing. At revealing any of the following defects should refer to their adjustment in tire shops.

Carefully check the tire for cuts, punctures and got stuck nails or buttons. Sometimes after puncturing tires nail it still some time holds pressure or lowers very slowly. If you suspect the presence of such "slow puncture", first check the tightness of the pump nipple valve. Then inspect the tread for the presence of foreign objects stuck or embedded earlier puncture, start again to pass air. If you suspect that there is a puncture, to make sure his presence is possible, moistened suspected site with soap and water. If you have a leak solution begins to bubble. If the puncture is not too big bus can usually be repaired in any tire shop.

Inspect the inner side surface of the tires on presence on them of signs of leak of brake fluid, - if any, immediately check the status of the relevant brakes.

Checking tire pressure

Check the air pressure should be performed only on cold tires!

The values of tire pressure given for a small load of the car are minimal, provides a comfortable movement. Increased tire inflation pressure in accordance with the recommendations with increasing loading degree has a positive effect on the drivability also allowed to use also under normal load, although associated with some violation smoothness.

PERFORMANCE ORDER

Maintaining proper tire pressure increases their service life, saves fuel and improves the overall ride comfort. To check the pressure you need a special gauge. Always keep the pressure gauge in your glove compartment, - indications of gauges built into the nozzle air hoses at gas stations, should not be trusted. Always check the pressure on cold tires (ie, before traveling by car). If you check the pressure in the tires warm or heated, it will lead to an overestimation of the pressure gauge because of the thermal expansion of tires. In this case it should never be lower pressure, as After cooling, the tire it will be below normal. Unscrew the cap from the valve of the pump, the speaker of the drive wheel or hub cap, and then firmly press the gauge to the valve nozzle. Consider instrument readings and compare them with recommended in Specifications / on the label attached to the back of the cover of the fuel filler tank. Do not forget to replace the cap to prevent entry into the mechanism of the pin dirt and moisture. Check the pressure in all four tires and refill if necessary them to the recommended pressure value. Do not forget to maintain the required pressure in the spare wheel. Remove the valve cap. Tyre pressure checked once a month, as well as during maintenance (including spare wheel). When testing using a special gauge or a pressure gauge, built-in compressor. Do not trust the testimony of gauges built into the nozzle of compressors used for tire inflation at petrol stations. In addition, the air pressure should be checked before each long trip since in this case, increases thermal load on the tires. The required air pressure in the tires is shown on a label located on the inside of the fuel tank cap. When using winter tire air pressure must be increased to 0.2 kgf / cm 2 with respect to the set value. Air pressure narrow tire spare wheel is indicated on the sidewall of the disc. The tire pressure varies with changes in ambient air at 10 ?� C for about 0.1 kgf / cm 2. This should be taken into account in monitoring the tire pressure in the room, especially during the cold season.

Example:

Room temperature garage: about + 20 ?� C

Outdoor temperature: about 0 ?� C

Set pressure of air in tires = prescribed value + 0.2 kgf / ^cm 2

Checking the status of the valves of the pump wheel

Applied extenders valves must be checked for damage and contamination, leading to a breach of a seal. If necessary extenders should be replaced.

The valve of the pump wheel

Examples of typical wear of tire treads

Side wear

Insufficient pressure in the tire causes its overheating due to excessive movement during deflection, whereby the tread is not sufficiently pressed against the surface of the road. This leads to a loss of grip and excessive wear of the tread, not to mention the danger of leaving tire failure due to overheating. Check and adjust the pressure; Wrong disorder of wheels (deterioration on the one hand) - Repair or replace suspension parts; Too sharp turns - Slow down!

Central wear

Excessive tire pressure leads to accelerated wear of the central part of the tread, reduced grip, tighter traffic and increase the danger of fatal damage of a slope. Check and adjust the pressure. If you have to pump up tires for transportation of heavy goods to the specified for this purpose in the Specifications pressures, do not forget after that to pit it at transition in normal operation.

Uneven wear

Front tire may wear unevenly as a result of violations of wheel alignment. Check and adjust the angles of the can for a small fee in most tire shops.

Wrong collapse or Coast

Repair or replace suspension parts.

Defect suspension

Repair or replace suspension parts.

Unbalanced wheel

Make balancing of wheels.

Improperly installed convergence of front wheels

Align the front wheels.

Obtrepannost edges of the tread pattern is a sign of wear and tear, it is best detected by touch.

The rotation of the wheels

The rotation of the wheels is permitted only with the same size front and rear wheel assemblies.

PERFORMANCE ORDER

Rotation of the wheels are produced, depending on the degree of tire wear every 5-10 thousand kilometers. At the same time watch out for the preservation of the direction of rotation of the wheels (for directional tires). Rotation should be performed before the onset of the characteristic signs of tire wear: wear shoulder (front wheel) / middle part of tread (rear wheels). Each rotation of the wheel assembly thoroughly clean the inside. After finishing the procedure do not forget to check the tire inflation pressure (see. Above). To avoid loosening of wheels tighten wheel bolts in strict accordance with the requirements of the Specifications, use only original wheel bolts with the company logo Mercedes-Benz!

The spare wheel is lightweight

On models with the AMG complete flat tire in place of the failed wheel assembly mounted spare wheel is lightweight, which is as soon as possible should be replaced with a standard - compact spare tire is designed to run no more than 20 000 km. The speed of the compact spare wheel when installed must not exceed 80 km / h.

Using the same time more than one spare wheel lightweight unacceptable.

Changing wheels

See. Section Poddomkrachivanie / hanging out of the car and transport in case of an accident.

Wheel bolts