Audi A4, S4

since 2000 of release

Repair and car operation

Audi A4, S4
+ Introduction
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
+ Systems of cooling, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
- Systems of electric equipment of the engine
   + ignition and engine management System
   + System of preheat of the diesel engine
   + Diagnostics of systems of electronic control and diagnostic equipment
   - Charging and start systems
      General information
      The storage battery - the main data and acquisition of the new battery
      Check and charging of the storage battery
      Replacement of the storage battery
      Storage of the storage battery
      Charging system - general information and security measures
      Check of system of a charging
      Removal and generator installation
      Removal and regulator installation tension/replacement of brushes
      System of start of the engine - the general information and precautionary measures
      Removal and starter installation
      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

Elements of a starter of Bosch with a reducer

1 — Ø/m the valve
2 — the Returnable spring
3 — the Anchor
4 — Screws
5 — the Target 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 — Shchyotkoderzhatel
21 — a collector Cover
22 — Prostavka
23 — a C-shaped latch
24 — Screws

The unique task 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 storage 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 a stator with windings of excitement, an anchor with the obgonny coupling, covers with shchyotkoderzhatel 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 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 shlitsa 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 a stator and an anchor and an anchor of a starter starts to rotate together with a nave and the obgonny coupling.

After engine start frequency of rotation of a gear wheel exceeds 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 shaft of an anchor of a starter. 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 a 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 situation P or N.

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

Precautionary measures

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

    Do not hold a starter included a long time. It can overheat and fail. Do not include a starter more than for 15 seconds, and before repeated inclusion wait for 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 engine start. The starter is connected directly to the battery and at the inaccurate address can light up or cause short circuit. Before the beginning of works always disconnect a weight cable from the battery.