Mercedes W124

since 1985-1995 of release

Repair and car operation

W124 Mercedes
+ Governing bodies and control devices
+ 2. Maintenance (diesel engines)
+ 4. Repair of 6-cylinder petrol SOHC engines
+ 5. Repair of 6-cylinder petrol DOHC engines
+ 6. Repair of the diesel engine established in the car
+ 7. Major maintenance of engines
+ 10. System of injection of BOSCH CIS-E fuel (KE-JETRONIC)
+ 11. System of injection of BOSCH HFM fuel
+ 12. Fuel system of diesel engines
- 13. Fuel system of diesel engines
   13.2. General information
   13.3. Catching system паров fuels
   13.4. System of ventilation of a case
   13.5. Final collector
   13.6. System of repeated burning of exhaust gases (EGR)
   13.7. Turbonagnetatel
   13.8. Exhaust system
   13.9. Katalichesky converter
+ 15. System of ignition of 4-cylinder petrol engines
+ 16. System of ignition of four-cylinder petrol engines
+ 19. Mechanical transmission
+ 20. Automatic transmission

13.7. Turbonagnetatel


The capacity which can develop the engine, depends on amount of air and fuel which arrives in engine cylinders. For increase in engine capacity it is necessary to increase both amount of submitted air, and fuel. Giving of bigger amount of fuel will not give effect until there will be sufficient for its combustion an amount of air, excess of not burned down fuel that leads to an overheat of the engine which besides, thus strongly smokes differently is formed. For increase in amount of the air submitted to the engine, the turbonagnetatel who compresses the air submitted to the chamber of combustion is used.

Turbonagnetatel consists of the centrifugal air pump and the turbine, connected by means of the general rigid axis among themselves. Both these an element rotate in one direction and with identical speed. Energy of a stream having fulfilled shy gases which in ordinary engines are not used, here will be transformed to a torque putting in action a turbonagnetatel. Leaving engine cylinders the fulfilled gases have high temperature and pressure. They are dispersed to a high speed and come into contact to shovels of the turbine which will transform their kinetic energy to mechanical energy of rotation. This transformation of energy is accompanied by decrease in temperature of exhaust gases and their pressure. Turbonagnetatel sucks in air via the air filter, compresses it and submits to engine cylinders. Amount of fuel which can be mixed with air, thus it is possible to increase that allows the engine to develop big capacity.

Turbonagnetatel is established under a final collector. For greasing of a turbonagnetatel engine oil moves under pressure on special трубопрово du from a head of the block of cylinders. In the structure the turbonagnetatel has the valve of dumping and a vacuum diaphragm which serves for restriction of the pressure submitted by a turbokompressor to an inlet collector.

As the turbokompressor works at high speeds, it is necessary to be careful and purity that pollution did not get to a turbokompressor and did not put it out of action.


Before a detachment of any elements of a turbonagnetatel carefully them clear. For protection against pollution the elements removed from a turbonagnetatel arrange in the tight container. For an exception of hit of pollution in a turbonagnetatel close air channels of a turbonagnetatel.


A–from the air filter;
B–to an inlet collector;
C–from a final collector;
D–to a reception exhaust pipe;
F–tube of supply of oil;

H–branch pipe of supply of exhaust gases;
J–EGR valve;

1. Remove a weight wire from the accumulator.
2. Release clamps and remove a mudguard from the lower part of a motor compartment.
3. Remove the air filter. On models with an oxidizer unscrew screws and remove the thermofilter established between the air filter and an oxidizer.
4. Weaken collars and remove the airpro-waters, a connecting turbogenerator with the air filter (see drawing).
5. Mark and disconnect vacuum hoses from the diaphragm and EGR valve case.
6. At existence, weaken collars and remove the goffered hose from the EGR valve basis.
7. Unscrew nuts and remove an oxidizer together with an arm from a final collector.

On cars without an oxidizer the branch pipe of supply of exhaust gases to a turbonagnetatel is established.

8. Weaken collars and remove the air pipes, connecting a turbonagnetatel with an inlet collector.
9. Weaken collars and remove from a turbonagnetatel the mixing tube located at the basis of the EGR valve.
10. Unscrew connecting nuts and disconnect from a turbokompressor of a pipe of giving and oil return. Remove sealing laying. Take submitting oil pipe from a fastening bracket on an inlet collector.
11. Unscrew nuts and separate from a turbonagnetatel a reception exhaust pipe. Remove laying.
12. Unscrew bolts and remove a turbonagnetatel from an arm.


1. Installation is made in sequence, return to removal taking into account the next moments.
2. Before a tightening of bolts of fastening of a turbonagnetatel to an arm acquire a nut of fastening of a reception exhaust pipe to a turbonagnetatel.
3. Apply a thin film high-temperature greasing on a carving and heads of new bolts of fastening of a connecting pipe of an oxidizer, then screw in bolts and tighten them the demanded moment.
4. Using pure engine oil, wash out a pipe of supply of oil to турбонагне to a tatel and an entrance opening for oil in a turbonagnetatel. Establish a maslopriyemny pipe and tighten connecting nuts the demanded moment.
5. According to earlier made marking connect vacuum hoses.
6. Start the engine in a mode of idling and let's to it work on these turns at least 1 minute in order that oil arrived to bearings of a turbonagnetatel.