Audi A4, S4

Since 2000 of release

Repair and car operation



Audi A4, S4
+ Introduction
+ Controls and receptions of safe operation
+ Current leaving and service
+ The engine
+ Systems of cooling, heating and the air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
- Systems of an electric equipment of the engine
   + Ignition and engine management system
   + System of preheat of the diesel engine
   + Diagnostics of systems of electronic control and the diagnostic equipment
   - Gymnastics and start systems
      The general information
      The storage battery - the basic data and acquisition of the new battery
      Check and gymnastics of the storage battery
      Replacement of the storage battery
      Storage of the storage battery
      Gymnastics system - the general data and security measures
      Check of system of gymnastics
      Removal and generator installation
      Removal and installation of a regulator of pressure/replacement of brushes
      System of start of the engine - the general information and safety measures
      Removal and starter installation
      Check of system of start of the engine
+ Manual box of a gear change
+ 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 safety measures

The general information

Elements of starter Bosch with a reducer

1 — Э/м the valve
2 — the Returnable spring
3 — the Anchor
4 — Screws
5 — the Target shaft with planetary transfer
6 — the Working plug
7 — the Persistent washer
8 — a C-shaped latch
9 — a drive Casing
10 — Obgonnaja муфта
11 — the Prorate
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 — ShChyotkoderzhatel
21 — a collector Cover
22 — the Prorate
23 — a C-shaped latch
24 — Screws

Unique problem of system of start of the engine is maintenance of rotation of the engine with a speed, sufficient for start.

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

The starter represents the electric motor of a direct current with the mixed excitation with the electromagnetic traction relay. The starter consists of the case or статора with windings of excitation, an anchor with обгонной муфтой, covers with щёткодержателями and the traction relay.

At starter inclusion through a winding of the traction relay of a starter the current from the storage battery starts to proceed. The relay anchor is involved also relay contacts become isolated. Simultaneously the relay anchor through the lever moves обгонную муфту with a gear wheel. The nave обгонной муфты turns on screw шлицах a shaft of an anchor of a starter and turns as well a gear wheel that facilitates its input in gearing with a gear wreath of a flywheel. Through the closed contacts of the traction relay there is a current feeding windings статора both anchors and the starter anchor starts to rotate together with a nave and обгонной муфтой.

After start of the engine frequency of rotation of a gear wheel exceeds frequency of rotation of an anchor of a starter. In this case обгонная муфта it is freely turned, and the twisting moment is not transferred from an engine flywheel to a shaft of an anchor of a starter. After отпускания the ignition key the feed circuit of windings of the traction relay through the ignition switch is disconnected, the anchor of the traction relay is wrung out by a spring in a starting position, relay contacts are disconnected also a drive gear wheel leaves gearing with a gear wreath of a flywheel.

The starter with the involving relay is located to in parallel cranked shaft of the engine and fixed on a transmission.

The starter joins, only if selector AT is in position Р or N.

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

Safety measures

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

  • Do not hold a starter included 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 long time, and the engine is not started, not burnt down fuel gathers in the converter. It can lead to an overheat of a working surface of the converter after engine start.
  • The starter is connected directly to the battery and at the inaccurate reference can light up or cause short circuit.
  • Before the beginning of works always disconnect a cable of weight from the battery.