Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car



Mercedes-Benz
+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
- Power supply system and release
   + Power supply system of the petrol and diesel engine
   + System of injection of fuel of the petrol engine
   + System of injection of fuel of the diesel engine. Turbocompressor
   - Systems of release and decrease in toxicity of the fulfilled gases. Turbocompressor
      System of production of the fulfilled gases - general information
      Removal, installation of system of release and check of tightness
      Systems of decrease in toxicity of release - the general information
      Catalytic converter
      Turbocompressor - the general information, removal and installation
      The compressor of the blown air with the belt drive
      The intercooler - the general information
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment







Turbocompressor - the general information, removal and installation


On some petrol models the compressor of the forced air with the belt drive can be installed. It is considered in the Section Compressor of the Blown Air with the belt drive.

General information

On a turbocompressor shaft in two separate cases two driving wheels are located. The drive of turbine wheels is carried out from the fulfilled gases. They provide rotation of a shaft of a turbocompressor and by that both turbine wheels with a speed of 300 000 rpm. Lubricant of a turbocompressor is carried out from the engine lubrication system.

Owing to good filling of cylinders with the forced air engine capacity increases up to 100%.

The turbocompressor is intended for increase in engine capacity (to 100%) by increase in pressure of air in the inlet pipeline. Air not just comes to cylinders, and moves in them under pressure. Along with power pressurization creates increase in torque of the engine. Growth of power, among other things, depends on pressure of the forced air which as a rule, makes 1.0 atm. Pressure of the forced air is constantly controlled and regulated by the control unit of the engine. It excludes a possibility of excess of pressure over the established value. According to increase in air supply, TNVD increases fuel supply.

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 intercooler is installed (address the Section Removal and installation of the measuring instrument of mass of air). 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.

In comparison with the petrol engine the diesel engine has no need to reduce extent of compression because of pressurization that provides even in the lower range of numbers of turns full use of injectable fuel.

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

The turbocompressor represents the precision mechanism. Therefore at emergence of malfunction it has to be completely replaced.

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 any a component 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 compressor shaft, 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.