Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car



Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling systems, heating
- Power supply system and release
   + A power supply system and injection of fuel of the petrol engine - the general information
   + System of injection of fuel of the diesel engine - the general information
   + Control system of injection of fuel and HFM-SFI ignition (6-cylinder petrol engines)
   + Control systems of the LH-SFI and ME-SFI engine (8-cylinder petrol engines)
   + Control systems of injection of fuel and ignition of ME-SFI and LH-SFI (12-cylinder petrol engines)
   + Control system of fuel injection (diesel engines of the OM603.971 series)
   + Control system of fuel injection (diesel engines of the OM606.961 series)
   - System of a turbo-supercharging - the general information
      The intercooler - the general information, removal and installation
   Systems of decrease in toxicity of release - the general information
   System of production of the fulfilled gases - the general information
   Catalytic converter (petrol models)
+ Engine electric equipment
+ Gear shifting box
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment






System of a turbo-supercharging - the general information

Turbocompressor - general information, removal and installation

General information

Turbocompressor design (on the example of the engine 603.971)

137a — the Pneumatic actuator of the valve operating pressurization pressure
And — the Soaked-up air
In — the Forced air
With — the Fulfilled gases rotating the driving wheel of the turbine
D — the Exit of the fulfilled gases
Е — Perepuskna the turbocompressor valve
N — the Pressure head oil pipeline
J — the Return oil pipeline

and — Perepuskna the turbocompressor valve
b — the Rod
with — the compressor Case
d — the Driving wheel of the compressor
е — Connection with the operating highway
and — the turbine Case
g — the Driving wheel of the turbine
h — the turbocompressor Case


The turbocompressor is intended for increase in engine capacity by increase in pressure of air in the inlet pipeline. Air not just comes to cylinders, and moves in them under pressure. According to increase in air supply, TNVD increases fuel supply.

Function chart of management of pressurization (engine 603.971)

B5/1 — pressure Sensor
1 — TNVD
103 — the Aneroid compensator (ALDA)
110 — the Final collector
137 — the Turbocompressor
137a — the Pneumatic actuator of the valve of the managing director of pressurization pressure

138 — the Inlet pipeline
And — the Soaked-up air
In — the Forced air
With — the Fulfilled gases rotating the driving wheel of the turbine
D — the Exit of the fulfilled gases


The turbine of the compressor is given to rotation by the fulfilled gases. Gases, passing through a special casing (a compressor casing), move to the compressor turbine. The turbine rotates on a shaft on which other end there is a compressor wheel in a separate casing. It gives air under pressure to the pipeline.

Between the compressor and the pipeline the intermediate cooler of compressed air is established (intercooler). In the intercooler air is cooled, compressing at the same time. Partial pressure of oxygen increases that leads to increase in engine capacity.

Air pressure in the pipeline is limited to the special sensor. At achievement of extreme pressure the sensor opens the gate, limiting to that supply of the fulfilled gases to the turbine.

The shaft of the compressor is oiled motive which moves on specially intended hose. The shaft constantly "floats" in oil. From the compressor oil is taken away in the pallet on a returnable hose.

The turbocompressor is a component of a final collector and cannot be separated from it.

Precautionary measures

Speed of rotation of turbines of the compressor is huge, and working temperature is very big. To avoid getting injured and also not to damage a turbocompressor, observe the following precautionary measures:
  • Do not start the engine after removal of any component of a turbocompressor. Hit of foreign objects on shovels of turbines can lead to an exit of the last out of operation. You also risk to be traumatized from the objects which are thrown out from the turbine;
  • After removal of any components of a turbocompressor or hoses of an air inlet cover it with pure rags;
  • Do not give gas at once after start of the engine, especially if it is not heated-up. Oil cannot instantly grease a turbine shaft;
  • Never switch off ignition at once after a car stop. Do not press an accelerator pedal before an engine stop. At once after switching off of ignition oil ceases to move to a shaft of the compressor and some time it will rotate without lubricant;
  • Before killing the engine, let's it work on single turns several minutes during which the speed of rotation of the turbine considerably will decrease;
  • Regularly change oil, an oil filter and the air cleaner. Use of old oil will lead to formation of deposits on a shaft of the compressor and to its exit out of operation. Before disconnecting hoses of giving and return of oil from the compressor, carefully clear nearby surfaces. You store the removed components in tight containers.
  • Concerning removal and installation address also the Sections Removal and installation of a turbocompressor and the Supercharger of air - an installation detail.