Audi A4, S4

since 2000 release

Repair and operation of the car

Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
- Systems of electric equipment of the engine
   + System of ignition and engine management
   + System of preheat of the diesel engine
   + Diagnostics of systems of electronic control and diagnostic equipment
   - Systems of charging and start
      General information
      The battery - the main data and acquisition of the new battery
      Check and charging of the battery
      Replacement of the battery
      Storage of the battery
      System of charging - general information and security measures
      Check of system of charging
      Removal and installation of the generator
      Removal and installation of the regulator tension/replacement of brushes
      System of start of the engine - the general information and precautionary measures
      Removal and installation of a starter
      Check of system of start of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

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

General information

Bosch starter elements with a reducer

1 — Em the valve
2 — the Returnable spring
3 — the Anchor
4 — Screws
5 — the Output shaft with planetary transfer
6 — the Working fork
7 — the Persistent washer
8 — a C-shaped latch
9 — a drive Casing
10 — Obgonnaya the coupling
11 — Prostavka
12 — the Gear wreath

13 — the Spring ring lock
14 — the Through bolt
15 — the Back cover
16 — the Rubber insert
17 — the Lock plate
18 — the Anchor
19 — the Case with a field winding
20 — the Brush holder
21 — a collector Cover
22 — Prostavka
23 — a C-shaped latch
24 — Screws

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

The system of start consists of a starter, the battery, the switch of ignition, the relay and conducting. The involving relay is on the starter case.

The starter represents the electric motor of a direct current with the mixed excitement with the electromagnetic traction relay. 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 of a starter current from the battery starts proceeding. The anchor of the relay is involved and contacts of the relay become isolated. At the same time the relay anchor via the lever moves the obgonny coupling with a gear wheel. The nave of the obgonny coupling turns on screw vents of a shaft of an anchor of a starter and turns as well a gear wheel that facilitates input it in gearing with a gear wreath of a flywheel. Through the closed contacts of the traction relay there is a current feeding windings of the stator and anchors and the anchor of a starter starts rotating 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 cranked shaft of the engine and fixed on a transmission.

The starter joins, only if the AT selector is in the provision of P or N.

If the car is in the protection mode, the starter will not be turned.

Precautionary measures

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

  • Do not hold a starter included in a long time. It can overheat and fail. Do not include a starter more than for 15 seconds, and before repeated inclusion wait about two minutes. If you turn start a long time, and the engine is not started, not burned down fuel gathers in the converter. It can lead to an overheat of a working surface of the converter after start of the engine.
  • The starter is connected directly to the battery and at the inaccurate address can light up or cause short circuit.
  • Before works always disconnect a weight cable from the battery.