BMW 7_aya the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and methods of operation
3. Settings and routine maintenance of the car
4. Engine
5. Cooling systems of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
7.1. Systems of ignition, preheat and engine management
7.2. Systems of a charge and start
7.2.1. General information
7.2.2. The rechargeable battery - the general information, recommendations about service
7.2.3. System of a charge - general information and security measures
7.2.4. Removal and installation of the generator
7.2.5. Replacement of the regulator of tension
7.2.6. System of start of the engine - the general information and precautionary measures
7.2.7. Removal and installation of a starter
7.2.8. Replacement of the traction relay
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Cardan and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Schemes of electric equipment



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7.2.6. System of start of the engine - the general information and precautionary measures

General information

The only problem of system of start of the engine is ensuring rotation of the engine with a speed sufficient for its start.

The system of start consists of a starter, the rechargeable battery, the switch of ignition, the traction relay and a connecting electrical wiring.

The starter represents the electric motor of a direct current with the mixed excitement and the electromagnetic traction relay installed outside. The starter consists of the case or the stator with windings of excitement, an anchor with the obgonny coupling, covers with brush holders and the traction relay.

At inclusion of a starter through a winding of the traction relay current from the rechargeable battery begins to proceed. The anchor of the relay is involved and contacts become isolated. At the same time the relay anchor via the driving lever provides promotion of a gear wheel with the obgonny coupling, at the same time the nave of the coupling turns on screw vents of a shaft of an anchor of a starter and turns as well a gear wheel that facilitates input of the last in gearing with a gear wreath of a flywheel. Through the closed contacts of the traction relay there pass the current feeding windings of the stator and anchors and the anchor of a starter begins to rotate together with a nave and the obgonny coupling.

After start of the engine the frequency of rotation of a gear wheel exceeds the frequency of rotation of an anchor of a starter. In this case the obgonny coupling is freely turned, and the torque is not transferred from an engine flywheel to a starter anchor shaft. After an ignition key otpuskaniye the power-supply circuit of windings of the traction relay via the switch of ignition is disconnected, the anchor of the traction relay is wrung out by a spring in a starting position, contacts of the relay are disconnected and the gear wheel of the drive leaves gearing with a gear wreath of a flywheel.

The starter with the involving relay is located parallel to a bent shaft of the engine and fixed on the power unit.

Precautionary measures

When carrying out any works with system of start of the engine observe the following requirements:

  1. In order to avoid an exit э / the motor out of operation as a result of an overheat do not include a starter more than for 15 seconds, - before repeated inclusion wait not less than 1 minute. The long provorachivaniye of not started engine a starter leads to a congestion of not burned down fuel in the catalytic converter that is fraught with an exit of the last out of operation as a result of ignition at start implementation;
  2. The starter is connected directly to the rechargeable battery and the negligent treatment of him can be the reason of ignition as a result of short circuit;
  3. Before works on service of a starter always disconnect a negative wire from the battery.

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7.2.5. Replacement of the regulator of tension
following page"
7.2.7. Removal and installation of a starter