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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. Discs have a depth of 38 mm pressing - pressing depth is the distance from the center of the disc to the hard surface of the wheel on the brake disc or drum. Wheel bolts for steel and alloy wheels are the same size.
 | Installation alloy wheels other manufacturers may require other dimensions of the bolts.
Technology is improving. It may be that for older models other values are permitted tire pressure. Determines the dimensions specified in the documents of the car. |
- At a sports manner of driving it is recommended to increase the pressure in the front and rear tires of 0.2 kgf / cm 2. With increasing pressure should be based on the basic values for the various loading conditions.
- Snow tires tend to have a pressure of 0.2 kgf / cm 2 higher than the summer. It should take into account the recommendations of manufacturers of winter tires.
- Since winter tires have restriction on speed, in the field of vision must be reinforced plate specifying the maximum speed.
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Legend drives Example 6Jx15 6 - The width of the disc in inches J - Letter designation of height and contour disk rim flange x - Designation whole deep drive 15 - 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: 195/70 R 14 89 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, 175 R 14), then it is a "normal" relations. It is 82%. |
H - Speed Class H: up to 210 km / h (on new tires is not always). R - Radial construction 14 - Disk Size in inches 89 - Setting-duty | If the data between 14 and 89 is designation M + S, it comes with a winter tire tread. |
H - Designation permissible maximum speed. | Symbols of speed concern as to the summer and snow tires. Letter designations speed given in the specification. |
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 inspection of the tires allow you to avoid the 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 until them serious damage.
- 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 which is 2 mm or less. Tread depth can also be determined by a simple and inexpensive device, known as a tread depth gauge.
 | Indicators of wear of the tire tread to a depth of 1.6 mm are places marked on the sidewall of TWI |
- 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.
- Carefully examine internal lateral surfaces of tires on presence on them of signs of leak of brake fluid. If any, immediately check the brake system.
- 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. 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.
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 minimum values, provide comfortable movement. The increased air pressure in the tires provided for the vehicle at a high load, a positive effect on the car's handling also at low load is quite acceptable. Smooth rolling at the same time, however, it is somewhat reduced. |
- 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. |
 | Checking tire inflation pressure |
- 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:
The temperature in the room garage - about 20 ?� C
Outside temperature - about 0 ?� C
Set pressure tire prescribed value = + 0.2 kgf / cm 2
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Checking the status of the valves of the pump wheel | | Applied extenders valves must be checked for damage and contamination, leading to leakage. If necessary extenders should be replaced. |
- Remove the protective cap and an extension cord.
- Apply a small amount of valve soap solution or saliva. If an air bubble is formed, pull the insert (3), - use lip metal protective cap (2).
 | The valve of the pump wheel |
- Again check valve. If bubbles appear and the valve can not tighten, replace (work HUNDRED).
- Be sure to re-install the protective cap.
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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 Overpressure 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 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. |
- 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 are strictly in accordance with the requirements of Specifications, use only original wheel bolts with the company logo Mercedes-Benz! |
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The spare wheel is lightweight | - When a flat tire in place of the failed wheel assembly mounted spare wheel is lightweight, which is as soon as possible should be replaced with the standard wheel design - the reserve is designed to run no more than 20 000 km.
- If necessary, spare tire wheels can be mounted on the impeller, provided it meets its other by size impellers.
| The tires were in use for more than 6 years should be used only in extreme cases when there is no alternative. |
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Models with a joint company AMG | | There is a risk of an accident! If the spare tire is mounted lightweight, due to the different sizes of tires should be considered to change the dynamic properties of the car. Realizing driving style to the situation. |
- Spare wheel lightweight design provides for short-term use only, subject to the prescribed air pressure in the tires and the maximum speed of 80 km / h.
- Operation with more than one spare wheel lightweight construction is not allowed.
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Changing wheels See. Section Poddomkrachivanie and towing. Wheel bolts | - The damaged mechanically or as a result of corrosion of the wheel bolts must be replaced.
- Before screwing the wheel bolts must not be lubricated by any trains.
- In case of damage to the threads in the wheel hub should immediately drive off the car to the service station Mercedes-Benz to perform necessary regenerative repair.
- Before installing the wheels, check the cleanliness of surfaces interfacing with the drive hub.
- To avoid loosening of wheels tighten wheel bolts are strictly in accordance with the requirements of Specifications, use only original wheel bolts with the company logo Mercedes-Benz!
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