Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
- Kuzovnaja electrosystem
   Minus to "weight"
   Orientation in electrosystem
   Plug connections
   The central switchboard
   The additional block of the relay
   The relay and management blocks
   The unloading relay of contact Х
   Safety locks
   The table of safety locks
   Electric schemes
   + The full electroscheme of car Audi 80: the 2-litre 4-cylinder engine (66 kw)
   + The 2-litre 4-cylinder engine (85 kw)
   + The 2,3-litre 5-cylinder engine (98 kw)
   + The 2,6-litre 6-cylinder engine (110кВт)
   + Additional equipment
   + The storage battery
   - The generator
      The indicator of gymnastics of the accumulator
      Pressure regulator
      Independent repair of the generator and regulator
   Condition check клинового or полилинового a belt
   Tension клинового a belt
   Tension клинового or поликлинового a belt
   Torn клиновой a belt
   Overheat of the engine because of damage клинового a belt
   The review wedge and полиwedge belts
   Replacement клинового a belt
   The list of malfunctions
   The list of malfunctions
+ Ignition system
+ Illumination
+ 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 firm Bosch it is necessary to turn out three screws with crosswise шлицем (1), to remove wire B + from a carving bolt (3) and to wring out two fixing ledges (arrow).

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

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

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

Usually the generator does not demand repair, except cases of replacement of brushes of the generator. More serious damages cannot be eliminated house means.

Check of pressure of gymnastics


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

Check of brushes


    To disconnect the negative plug of the storage battery. Firm Bosch generators: to uncover on the accumulator behind (where is available). To disconnect a regulator from the generator. For this purpose to turn out two screws. To cast away a regulator, that not заедали in holders coal brushes. To measure выступание brushes. Length of new brushes of 13 mm; the minimum length of 5 mm. Firm Valeo generators: to turn out both fixing screws of a regulator on the back party of the generator. To extend a regulator. To measure length of acting brushes. If the residual length has made 5 mm – brushes are worn out. Brushes of generators of firm Valeo cannot be got separately; it is necessary to change all regulator.

Replacement of brushes

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

However at generators of firm Bosch of old generation similar replacement is possible. The soldering iron, solder and, except that, knowledge of soldering for this purpose be required.


    To remove a pressure regulator under the scheme described above. To unsolder multiwire flexible wires, to extend coal brushes. To remove press springs from old brushes and to put on the new. To solder multiwire flexible wires. Thus to apply it is a little tin and to work quickly that wires have not soaked up a lot of tin. Otherwise they become rigid.

 Подказка: if brushes it is possible to check up simultaneously copper contact rings (on them are removed brushes) go. If on them scars extra earnings it is necessary in a workshop after the autoelectrician were found out to grind them and to polish.

Generator removal


    To disconnect a wire of "weight" from the accumulator, danger of occurrence of short circuit otherwise is great. Models with 4-cylinder engines: to uncover (where is available) шарнирного a bolt in front on a casing of a gear belt. Models with 5-cylinder engines: to remove the bottom protection of a motor compartment. Models with 4 and 5-cylinder engines: to disconnect wires from the generator. To disconnect a cable to "weight" where is available. To turn out a tightening bolt on an adjusting lath of the generator. To weaken and remove клиновой or поликлиновой a belt To weaken and remove шарнирный a bolt, holding thus the generator. Models with 6-cylinder engines: to remove the bottom protection of a motor compartment. To remove клиновой a belt (the description of works more low in this chapter). From below to remove a connecting wire and directing a stream of cooling air. To weaken fixing bolts, to remove the generator.

Movement with faulty the generator

 Helps: if the generator or a pressure regulator do not work, it is still possible to continue a trip as a power supply role can incur 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 pressure is necessary for the electric fuel pump. Besides, often storage battery is charged only on 2/3. Depending on battery capacity it is possible to pass still a minimum 5 ч. 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 it is necessary for a starter 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. To move without a headlight and antifog headlights at night. In addition to disconnect cables from the generator and заизолировать separately that the accumulator could not be discharged through the faulty generator or a pressure regulator.