Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
- Body electrosystem
   Minus to "weight"
   Orientation in electrosystem
   Plug connections
   Central switchboard
   Additional block of the relay
   Relay and control units
   Unloading relay of contact X
   Safety locks
   Table of safety locks
   Electric circuits
   + Full electroscheme of the Audi 80 car: 2-liter 4-cylinder engine (66 kW)
   + 2-liter 4-cylinder engine (85 kW)
   + 2,3-liter 5-cylinder engine (98 kW)
   + 2,6-liter 6-cylinder engine (110кВт)
   + Additional equipment
   + Storage battery
   - Generator
      Battery charging indicator
      Tension regulator
      Independent repair of the generator and regulator
   Check of a condition of a maple or polilinovy belt
   Tension of a maple belt
   Tension of a maple or poliklinovy belt
   Torn maple a belt
   Engine overheat because of damage of a maple belt
   Review of maple and poliklinovy belts
   Replacement of a maple belt
   List of malfunctions
   List of malfunctions
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Independent repair of the generator and regulator

For removal of a cover (2) generators of Bosch firm need to be turned out three screws with a crosswise shliyets (1), to remove B wire + from a carving bolt (3) and to wring out two fixing ledges (arrow).

The regulator of tension (2) fastens two bolts with a crosswise shliyets (1). The position (3) designates a rotor axis.

On the removed regulator of tension ((4) on an illustration the new design is shown) the length of brushes (2) is designated by shooters. The position (1) shows contacts of a regulator of tension, (3) are fixing bolts.

On an illustration measurement of length of sliding electrographite contacts at the removed regulator of tension of Bosch firm of older design is shown: brushes should not be shorter than and = than 5 mm.

Usually the generator does not demand repair, except cases of replacement of brushes of the generator. It is impossible to eliminate more serious damages with house means.

Check of tension of a charging


  1. To attach вольметр between the plug of a thick red wire of the generator and "weight".
  2. To leave the engine to work at average turns.
  3. If the regulator of tension is serviceable, the voltmeter should show 13,3 till 14,6 Century.
  4. If it not so to check brushes or to replace a regulator.
  5. Otherwise the generator is faulty.

Check of brushes


  1. To disconnect the negative plug of the storage battery.
  2. Bosch firm generators: to uncover on the accumulator behind (where is available).
  3. To disconnect a regulator from the generator. For this purpose to turn out two screws.
  4. To cast away a regulator in order that did not jam in holders coal brushes.
  5. To measure a vystupaniye of brushes.
  6. Length of new brushes of 13 mm; minimum length of 5 mm.
  7. Valeo firm generators: to turn out both fixing screws of a regulator on the back party of the generator.
  8. To extend a regulator.
  9. To measure length of acting brushes.
  10. If the residual length made 5 mm – brushes are worn-out.
  11. Brushes of generators of Valeo firm cannot be got separately; it is necessary to change all regulator.

Replacement of brushes

Replacement of brushes on regulators of new generation of generators of Bosch firm is impossible now – therefore coal brushes are not on sale now as spare parts. If they wore out, it is necessary to change all regulator. The same it is possible to tell about the Valeo firm generator; coal brushes are not on sale as the spare part – it is necessary to buy a new regulator of tension if brushes of the old wore out.

However at generators of Bosch firm of old generation similar replacement is possible. For this purpose the soldering iron, solder and, besides, knowledge of soldering be required.


  1. To remove a tension regulator according to the scheme described above.
  2. To unsolder multiwire flexible wires, to extend coal brushes.
  3. To remove press springs from old brushes and to put on the new.
  4. To solder multiwire flexible wires.
  5. Thus to apply it is a little tin and to work quickly in order that wires did not soak up a lot of tin. Otherwise they become rigid.

 Podkazka: if brushes are removed, it is possible to check at the same time copper contact rings (on them brushes go). If on them scars extra earnings were found, it is necessary in a workshop after the autoelectrician to grind them and to polish.

Generator removal


  1. To disconnect a "weight" wire from the accumulator, danger of emergence of short circuit otherwise is great.
  2. Models with 4-cylinder engines: to uncover (where is available) a sharnirny bolt in front on a casing of a gear belt.
  3. Models with 5-cylinder engines: to remove the bottom protection of a motor compartment.
  4. Models with 4-and 5-cylinder engines: to disconnect wires from the generator.
  5. To disconnect a cable to "weight" where is available.
  6. To turn out a tightening bolt on an adjusting level of the generator.
  7. To weaken and remove maple or poliklinovy a belt
  8. To weaken and remove a sharnirny bolt, holding thus the generator.
  9. Models with 6-cylinder engines: to remove the bottom protection of a motor compartment.
  10. To remove maple a belt (the description of works is lower in this chapter).
  11. From below to remove a connecting wire and directing a stream of cooling air.
  12. To weaken fixing bolts, to remove the generator.

Movement with faulty the generator

 Helps: if the generator or a regulator of tension do not work, it is still possible to continue a trip as a role of the power supply can assume the accumulator. In the afternoon of its stock of a current suffices for a long time because to electronic control by ignition/injection, and also the minimum tension is necessary for the electric fuel pump. Besides, often storage battery is charged only on 2/3. Depending on capacity of the battery it is possible to pass at least 5 more h. In the winter complicating circumstance is the general weakness of the accumulator. Besides, it is necessary to include headlights earlier.

Therefore the economy of a current should become the motto: it is not necessary to interrupt needlessly a trip because the starter needs especially a lot of current. Whenever possible it is necessary to be got «with наката». Not to include heating of back glass, an oven and radio. To address with a screen wiper more economically. At night to move without a driving beam and fog lights. In addition to disconnect cables from the generator and заизолировать separately in order that the accumulator could not be discharged via the faulty generator or a tension regulator.