BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engine
   + 3.1.2. Specifications
   + 3.2. Dismantle and capital repairs of the engine
   - 3.3. Engine electric equipment
      3.3.2. Specifications
      3.3.3. The battery - launch of the engine in emergency situations
      3.3.4. Removal and installation of the battery
      3.3.5. Power cables
      + 3.3.6. System of ignition
      + 3.3.7. System of a charge of the battery
      + 3.3.8. System of launch of the engine
      3.3.9. Malfunctions of the generator
      3.3.10. Main malfunctions of electric equipment
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips


3.3.9. Malfunctions of the generator


Bad contact of brushes
Brushes hanged (dirt), are worn-out. Contact rings are polluted.
Malfunction of the vypryamitelny block
Connections of plugs with conclusions of the battery of a "mass" wire are polluted or is absent. A mistake at connection of the battery (return polarity). The wrong connection to the additional battery at launch of the engine. Electric welding was carried out at the connected generator. Lack of contact of conclusions in generator sockets, pollution of conclusions or defeat by their corrosion.
Malfunction of the bearing
Most often arises because of an excessive tension of a driving belt. At load of a generator pulley the sliping belt makes a sharp sound which does not mean at all that the belt is tense. The worn-out driving belt leans on a pulley stream bottom, but not on pulley sidewalls, as generates such sound.