Mercedes S-Class W-140

1991-1999 of release

Repair and car operation



Mercedes S-Class
+ Mercedes-Benz Cars of a class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
+ Systems of cooling, heating
+ Power supply system and release
- Engine electric equipment
   + ignition and engine management Systems - the general information
   - Charge and start systems
      The storage battery - the main data, shutdown and acquisition of the new battery
      Check and charging of the storage battery
      Storage of the storage battery
      Charging system - general information and security measures
      Check of system of a charging
      Details of installation of the generator
      System of start of the engine - the general information and precautionary measures
      Check of system of start of the engine
+ gear shifting Box
+ Avtomaticheckaya transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



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

General information

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 shchetkoderzhatel 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 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 relay of a chain of system of start is located in the main unit at number 17.

The starter joins, only if the AT selector is in the situation "R" 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:

   a) 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;
   b) The starter is connected directly to the battery and at the inaccurate address can light up or cause short circuit;
   c) Before the beginning of works always disconnect a weight cable from the battery.