Mercedes S-Class W-140

1991-1999 of release

Repair and car operation

Check of a condition of tires and pressure in them, designation of tires and disks of wheels, rotation of wheels

On the tire S420 and S500 models with summer drawing of a protector it is authorized to apply only on disks from an easy alloy, the tire with winter drawing of a protector - on disks from an easy alloy and steel.

Depending on model and equipment tires and disks of the various sizes can be established. Disks have depth of a press fitting of 38 mm. Depth of a press fitting is a distance from the disk middle to a persistent surface of a wheel on a brake disk or a drum. Wheel bolts for steel and light-alloy wheels have the identical sizes.

At installation of light-alloy wheels of other producers bolts of other sizes can be demanded.

The equipment is improved. Can be so that for older models other values of pressure in tires are admissible. The sizes specified in documents to the car are defining.

At a sports manner of driving it is recommended to increase pressure in lobbies and back tires by 0.2 bar. At increase in pressure it is necessary to start with a base-line value for various conditions of loading.

Winter tires as a rule have pressure upon 0.2 bar higher than summer. It is necessary to consider recommendations of manufacturers of winter tires.

As winter tires have restriction till speed, in sight of the driver the plate with the indication of the maximum speed should be strengthened.

Designations of disks

Example 6Jx15

Width of a disk in inches	6
Alphabetic reference of height and contour onboard закраины disk rims	J
Designation of an integral deep disk	x
Diameter of a disk in inches	15
Admissible lateral palpation on onboard закраине a disk:	0.8 mm
Admissible radial palpation on the landing shelf of a disk:	0.5 mm

Designation of tires

Example: 195/70 R 14 89 H

Width of the tire in mm	195
The relation of height to width (the height of cross-section section of the tire makes 70 % from width)	70
Class of speed, N: to 210 km/h (on new tires it is brought not always).	H
Radial design	R
The size of a disk in inches	14
Loading capacity parameter	89

If hotel data on the relation of width to height are absent (for example, 175 R 14), mean are a question of the "normal" relation. It makes 82 %.

If between data 14 and 89 there is M+S designation, it is a question of tires with a winter protector.

Designation of admissible maximum speed

Symbols of speed belong both to summer, and to winter tires. Alphabetic references of speed are given in Specifications.

Date of manufacturing of the tire

Date of manufacturing is put down on the tire in a code of the producer

Example: DOT CUL2 UM8 of 019 TUBELESS

DOT	Department of Transportation (Ministry of Transport of the USA)
CU	reduction of the name of the manufacturer
L2	size of the tire
UM8	tire execution
4600	manufacturing date - the 46th working week 2000
TUBELESS	tubeless (TUBETYPE - the tire with the chamber)

Regular check of a condition of tires will allow you to avoid the troubles connected with stops in a way because of the lowered wheel. Besides, such checks give valuable information on possible problems with a 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 the worn-out. This size represents minimum admissible depth of a protector; it is in most cases recommended to replace the tires, which depth of a protector of 2 mm and less. It is also possible to determine depth of a protector by the simple and inexpensive adaptation known under the name of a measuring instrument of depth of a protector.

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

Carefully check the tire on existence of cuts, punctures and got stuck nails or buttons. Sometimes after a tire protykaniye a nail it still some time holds pressure or lowers very slowly.

At suspicion on existence such «a slow puncture» at first check tightness of a nipple of the gate of a rating. Then examine a protector on presence at it got stuck strangers of subjects or closed up before the punctures which have started over again to pass air. If there is a suspicion that there is a puncture, to make sure of its existence it is possible, having moistened a suspected site with soap water. In the presence of leak solution will start to bubble. If not too big, the tire it is usually possible to repair a puncture in any shinomontazhny workshop.

Carefully examine internal lateral surfaces of tires on existence of signs of leakage of brake liquid on them. If those are available, immediately check brake system.

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

Recommendations

Always keep an exact manometer in the ware box. Indications of the manometers which have been 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-up tires, it will lead to overestimate of indications of a manometer because of thermal expansion of tires. In this case never it is necessary to lower pressure since after tire cooling it will appear lower than norm.

Screw together a protective cap from the gate of a rating acting from a disk of a wheel or from a cap of a nave, then densely press to the gate a manometer nozzle. Consider instrument readings and compare them with recommended in Specifications. Do not forget to establish into place a protective cap for hit prevention in the mechanism of a 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 demanded pressure and in a spare wheel.

Check of pressure of air in tires

Check of pressure of air should be carried out only on cold tires.

Unscrew a gate cap.

Pressure of air in tires is checked once a month, and also at carrying out service (including spare a wheel). At check use a special manometer, or the manometer which has been built in the compressor.

It is not necessary to trust indications of the manometers which have been built in nozzles of compressors, tires used for pumping at petrol filling stations.

Besides, pressure of air are necessary for checking before each long trip since temperature load of tires in this case increases.

Necessary pressure of air in tires is given on a sticker being on inside of a cover of a fuel tank.

At use of winter tires pressure of air should be increased by 0.2 bar in relation to the established value.

Pressure of air of narrow tires of a spare wheel is specified on боковине a disk. Pressure of air in tires changes depending on change of temperature of air on 10°С approximately on 0.1 bar. It should be considered at monitoring procedure of pressure of air in tires indoors, especially in a cold season.

Example:

Temperature in garage	Near + 20°С
Temperature of external air	Near 0°С
Established pressure of air in tires	The ordered value, + 0.2 bar

Values of pressure of air in the tires, given for small loading of the car, are the minimum values providing comfort of movement. The air elevated pressure in the tires, provided at the raised loading of the car, positively affects controllability of the car as well at small loading and is quite admissible. Smoothness of a kacheniye thus, however, decreases a little.

Check of the gate of tires

Applied extension pieces of gates should be checked on existence of damages and the pollution conducting to a leakage. If necessary it is necessary to replace extension pieces.

Unscrew a protective cap and the extension piece.

Gate of tires


1 both 2 — Rubber and metal caps 3 — the Gate 4 — the gate Case

Put on the gate a small amount of soap solution or a saliva. If the air vial is formed, tighten an insert (3), - use a ledge of a metal protective cap (2).

Again check the gate. If there are vials and the gate it is not possible to tighten, it it is necessary to replace (work HUNDRED).

Surely again establish into place a protective cap.

Examples of characteristic wear of protectors of tires

Lateral wear

Insufficient pressure in the tire leads to its overheat at movement owing to an excessive deflection therefore the protector does not nestle sufficiently on a road surface. 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

Superfluous pressure

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

Check and adjust pressure.

If you had to pump up tires for transportation of heavy cargoes to specified for this purpose in Specifications of value of pressure, do not forget after that to pit it upon transition to a normal mode of operation.

Non-uniform wear

Tires of forward wheels can non-uniformly wear out as a result of violation of adjustment of corners of installation of wheels.

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 corners of installation of forward wheels.

The Obtrepannost of edges of a pattern of the protector, being a wear sign, best of all comes to light to the touch

Rotation of wheels

Rotation of wheels is authorized only at the identical size of lobbies and back wheels

Rotation of wheels make depending on wear of tires each 5000-10000 km. Thus watch preservation of the direction of rotation of wheels (for the directed tires).

Rotation is necessary for making before emergence of characteristic signs of wear of tires. A characteristic sign of wear at tires of forward wheels is wear of a humeral zone of a protector, and at tires of back wheels - the protector middle.

At each rotation of wheels it is necessary to clear carefully them from the inside. After rotation of wheels check and if necessary modify pressure of air in tires (see above).

Bolts of fastening of wheels can weaken, if they were not tightened with the moment of an inhaling specified in Specifications. After replacement of wheels check the inhaling moment.

Apply only firm bolts of fastening «MB» designated by a star of "Mercedes-Benz". Other bolts can unscrew.

Spare wheel of the facilitated design

At tire damage the spare wheel of the facilitated design can be used as a normal wheel; it is recommended to replace as soon as possible, however, it with a normal wheel as it is calculated on limited run to 20 000 km.

At replacement of tires the tire of a spare wheel can be mounted on the driving wheel if the tire corresponds to execution of tires of driving wheels. If the tire is more senior than 6 years, it is recommended to be applied only at tire damage.

Models with tires of the size 245/45R18

If the spare wheel of the facilitated design is mounted, owing to the various sizes of tires it is necessary to reckon with change dynamic property of the car. Conform style of driving to a road situation.

As soon as possible replace a spare wheel of the facilitated design with a usual wheel.

Models with an AMG firm complete set

There is a danger of failure! If the spare wheel of the facilitated design is mounted, owing to the various sizes of tires it is necessary to reckon with change of dynamic properties of the car. Conform style of driving to this situation.

The spare wheel of the facilitated design is provided only for short-term using at observance of the ordered pressure of air in tires and the maximum speed of 80 km/h.

Operation with more, than one spare wheel of the facilitated design is inadmissible.

Replacement of wheels

Stamped steel disks, disks from an easy alloy with 15 and 6 openings (7 Ѕ Jx16). At replacement of tires the spare wheel can be used as the worker if the tire new, and execution of a disk and the tire corresponds to execution of working disks and tires.

See. Poddomkrachivaniye and towage in Introduction to the real Management undressed.

Bolts of fastening of wheels

Replace bolts of fastening of the wheels, having damages or rust traces.

Do not oil bolts or konsistentny greasing.

In case of damage of a carving to a nave of a wheel to continue movement it is impossible. It is necessary to address on HUNDRED "Mercedes-Benzs".

Make cleaning of a surface of a prileganiye of a wheel and a nave.

Apply only firm bolts of fastening «MB» designated by a three-final star of "Mercedes-Benz". Other bolts can turn away. A tightening of bolts make with the ordered effort (150 Nanometers).