Audi A4 with 2001- 2005 of release.
1. Operation and car maintenance service
2. The engine
3. Transmission
4. A running gear
4.1. Wheels and tyres
4.1.1. The general information on wheels and tyres
4.1.2. Specifications for re-equipment of disks and tyres
4.1.3. Indexes of speed of tyres
4.1.4. Marks on disks
4.1.5. Compound disks
4.1.6. Deterioration and ходимость tyres
4.1.7. Deterioration of high-speed tyres
4.1.8. Service of tyres
4.1.9. In regular intervals worn out tyres
4.1.10. Measurement of height of drawing of a protector
4.1.11. Unilateral deterioration
4.1.12. Diagonal non-uniform deterioration
4.1.13. Noise качения tyres
4.1.14. Balancing
4.1.15. Radial and lateral palpation of wheels and tyres
4.1.16. Check of radial and lateral palpation of a disk with the tyre by means of the indicator of hour type for tyres V.A.G 1435
4.1.17. Minimisation
4.1.18. Lateral withdrawal of the car
4.1.19. Elimination of lateral withdrawal
4.1.20. Damages of tyres
4.1.21. A design of the radial tyre
4.1.22. Loss of pressure of air in tyres
4.1.23. Damages of tyres because of errors at mounting (assembly damages)
4.1.24. Marks sidewallsы tyres
4.1.25. Shift of wheels
4.1.26. Instructions on replacement and installation of wheels
4.1.27. Change of tyres
4.1.28. Removal and installation of the case of the metal gate
4.2. The general data on a car running gear
4.3. Repair of a suspension bracket of forward wheels
4.4. A back suspension bracket
4.5. Tables
5. The steering mechanism
6. Brake system
7. An onboard electric equipment
8. A body
9. Electric equipment schemes



4.1.23. Damages of tyres because of errors at mounting (assembly damages)

The board core was broke off at a tyre rating

Fig. 4.26. The scheme of installation of the tyre on a disk: 1 – хамп (double хамп H 2); 2 – onboard закраина rims; 3 – an internal shoulder of a rim (e.g. a conic shelf); 4 – a rim; 5 – a disk; 6 – a cavity; 7 – an external shoulder of a rim (e.g. a conic shelf)

Modern radial tyres for cars are mounted exclusively on safe disks. Their rims have on shoulders an eminence 1 on all circle (fig. 4.26).
Хамп protects the tyre at driving with low pressure of air in it from соскальзывания from a rim shoulder.
At a tyre rating can happen that the tyre board not completely will move through external хамп rims.
In this case there is a danger of an excessive extension of the core of a board at too high pressure therefore its steel threads will be broken off partially or completely. Rupture of the core of a board is imperceptible outside.

Tyres with the damaged core of a board leaky sit on a disk rim. Such tyres are extremely unsafe at operation.
Besides, there is a danger that the torn core of a board in movement will be broken off completely, and the tyre will suddenly blow up. At rupture of the core of a board at a rating of the tyre the skeleton also collapses.

The tyre with the broken off core of a board and the destroyed skeleton

Fig. 4.27. The tyre with the broken off core

In drawing 4.27 the tyre with the broken off core and the destroyed skeleton as a result of an excessive stretching is represented at installation.
Damages of a board because of erroneous or wrong mounting on шиномонтажном the stand
Following errors at mounting can lead to serious damages of tyres:
– If at закатке the top board on шиномонтажном the stand the opposite board of the tyre not completely lies in a cavity;
– If the assembly head has incorrectly been adjusted;
– If the edge of an assembly roller slides on an onboard roller;
– In the presence of the worn out or sharp directing rollers.

Tyres with a board cut

Fig. 4.28. Tyres with a board cut

In such cases the board which is under a high voltage, can be made an incision, cut and-or jammed to a core wire (fig. 4.28).
Often in a damage zone traces of the beginning and the end of contact to a directing roller are visible.

Essentially it is necessary to grease both boards of the tyre and rim shoulders шиномонтажной with paste.
If damages at installation remain not noticed, there is a danger of destruction of the tyre at its further operation.
Never mount tyres without шиномонтажной pastes.
Do not pump up an explosive rating from above 3 bar.
Do not pump up the tyre from above 4 bar.
In the end of mounting lower pressure of air in the tyre to the ordered value.

4.1.22. Loss of pressure of air in tyres

4.1.24. Marks sidewallsы tyres