3.6. Check of a condition of tires and pressure in them, designation of tires and disks of wheels, rotation of wheels
Depending on model and equipment tires and disks of various sizes can be installed. Wheel bolts for steel and light-alloy wheels have the identical sizes.
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At installation of light-alloy wheels of production not Mercedes-Benz bolts of other sizes can be required. |
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At identification of discrepancies between the values of pressure of a rating of tires specified in Specifications and on Schild, the cover of the hatch of a jellied mouth of the fuel tank fixed from the inside, defining it is necessary to consider the last. |
At a sports manner of driving it is recommended to increase pressure in forward and back tires approximately by 0.2 kgfs/cm2, proceeding from base-line values for various conditions of loading.
Winter tires as a rule have pressure of a rating 0.2 kgfs/cm2 higher than summer, - pay attention to recommendations of manufacturers of winter tires.
Do not forget that use of winter tires as a rule imposes restrictions for the high-speed modes of the movement.
Designations of disks
Example of 7Ѕ J x 16 H2 ET63
7Ѕ — Width of a disk in inches
J — Alphabetic reference of height and a contour of an onboard zakraina of a rim of a disk
x \Designation of an integral deep disk
16 — Diameter of a disk in inches
Admissible side beating on the onboard zakrayena of a disk: 0.8 mm;
Admissible radial beating on the landing shelf of a disk: 0.5 mm.
Designation of tires
Example: 205/70 R 16 112 H
195 — Width of the tire in mm
/70 — Height relation to width (height of cross section of the tire makes 70% of width)
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If separate data on width relation to height are absent (for example, 205 R 16), means it is about the "normal" relation making 82%. |
R — the Radial design
16 — the disk Size in inches
112 — loading capacity Parameter
N — Designation of admissible maximum speed.
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Symbols of speed belong both to summer, and to winter tires. Alphabetic references of speed are given in Specifications. |
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The additional designation M+S demonstrates that the protector of the tire has winter execution. |
Date of production of the tire
Production is dated the tire in a code of the producer
Example: DOT CUL2 of UM8 019 TUBELESS
DOT — Department of Transportation (U.S. Department of Transportation)
CU — reduction of the name of the manufacturer
L2 — the tire size
UM8 — execution of the tire
4600 — date of production - the 46th working week 2000
TUBELESS — tubeless (TUBETYPE — the tire with the camera)
Regular conducting check of a condition of tires allows 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 long before emergence of more serious symptoms.
Protector pattern depth
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Indicators of wear of a protector of the tire up to the depth of 1.6 mm are in the places designated on a sidewall by TWI letters |
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.
Attentively examine the internal side surfaces of tires on existence of signs of leak of brake fluid on them, - if those are available, immediately check a condition of the corresponding brake mechanisms.
Check of pressure of air in tires
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An inspection of pressure of air should be carried out only on cold tires! |
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The values of pressure of air in tires given for small loading of the car are minimum, providing comfort of the movement. Increase in pressure of a rating of tires according to recommendations at increase in extent of loading positively affects controllability of the car as well it is allowed to application as well at normal loading, though is accompanied by some violation of smoothness of the course. |
PERFORMANCE ORDER |
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Example:
Temperature in a garage: about + 20 °C
Temperature of external air: about 0th °C
The established air pressure in tires = the ordered value + 0.2 kgfs/cm2
Check of a condition of gates of a rating of wheels
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The used extenders of gates have to be checked for existence of the damages and pollution leading to tightness violation. If necessary extenders should be replaced. |
Wheel rating gate
1 and 2 — Rubber/plastic and metal protective caps |
3 — the nipple 4 — the gate case |
PERFORMANCE ORDER |
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Examples of characteristic wear of protectors of tires
Side wear
Central wear
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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 fatal damage of a slope.
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Uneven wear
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.
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The Obtrepannost of edges of a pattern of a protector which is a wear sign best of all comes to light to the touch. |
Rotation of wheels
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Rotation of wheels is allowed only at the identical amount of forward and back wheel assemblies. |
PERFORMANCE ORDER |
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Spare wheel of the facilitated design
On AMG complete set models at damage of the tire to the place of the failed wheel assembly the spare wheel of the facilitated design which at the first opportunity should be replaced standard is established, - the compact spare wheel is calculated on a run no more than 20 000 km. Speed of the movement at the installed compact spare wheel should not exceed 80 km/h.
Use at the same time more, than one spare wheel of the facilitated design is inadmissible.
Replacement of wheels
See Razdel Poddomkrachivaniye / posting of the car and transportation in case of accident.
Bolts of fastening of wheels
PERFORMANCE ORDER |
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