Opel Omega

since 1993-1999 of release

Repair and car operation

Opel Omega
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Repair of engines
+ 4. Heating system and ventilation
- 5. Fuel, exhaust systems
   + 5.1. Petrol engines
   - 5.2. Diesel engine in volume 2,0 liters
      5.2.1. Technical characteristics
      5.2.2. Air filter and air inlet channels
      5.2.3. Accelerator pedal
      5.2.4. Filling and pumping of fuel system
      5.2.5. Fuel level sensor
      5.2.6. Fuel tank
      5.2.7. Check and adjustment of the maximum turns
      5.2.8. Electric knots of system of injection
      5.2.9. Fuel pump of a high pressure
      5.2.10. Moment of injection of fuel
      5.2.11. Fuel nozzles
      5.2.12. Turbonagnetatel
      5.2.13. Inlet collector
      5.2.14. Final collector
   + 5.3. Diesel V6 2,5-liter engine
+ 6. System of start of the engine
+ 7. Ignition system
+ 8. Coupling
+ 9. Transmissions
+ 10. Main transfer, semi-axes
+ 11. Brake system
+ 12. Suspension bracket and steering
+ 13. Body
+ 14. Body electric equipment

5.2. Diesel engine in volume 2,0 liters



There are two versions of the engine of 2 l: with a turbo-supercharging of low pressure (Х20DTL) and with a turbo-supercharging of a high pressure (X20DTH).

The fuel system consists of the car of a fuel tank established under a back part, the fuel filter with a separator of water, the fuel pump of a high pressure, fuel nozzles and pipelines. Before receipt in the filter fuel heats up an electric heater which is attached to the filter case.

Supply of fuel from the fuel filter to the fuel pump of a high pressure is provided with the pumping-up lopastny pump located in the fuel pump of a high pressure. Excess of fuel greases the fuel pump of a high pressure and comes back to a fuel tank.

The drive of the fuel pump is carried out by a gear belt. Speed of rotation of the fuel pump twice is less than speed of rotation of a cranked shaft.

The fuel pump copes with the help of electronic system. The system consists of the electronic control device (ECU), the control unit of the fuel pump and the following sensors:

  – the sensor of management of a pedal of an accelerator reports the ECU provision of a pedal of management by supply of fuel;
  – the sensor of temperature of cooling liquid reports ECU engine temperature;
  – the sensor of temperature of arriving air reports ECU the air temperature passing through the inlet channel, the sensor of temperature of oil reports ECU engine temperature;
  – the measuring instrument of a stream of air reports ECU amount of the air passing through the inlet channel;
  – the sensor of a cranked shaft reports the relative provision of a cranked shaft and frequency of its rotation;
  – the sensor of pressure reports relative pressure in a final collector;
  – the ABS system reports ECU relative speed of the car;
  – the switch of the compressor of central air of air reports ECU about central air inclusion.

On the basis of information received from sensors, ECU defines the moment of injection of fuel at all temperatures and power setting. ECU also operates system of repeated burning of exhaust gases and system of prestarting heating of the engine.

Fuel nozzles spray fuel in the vortical chambers located in a head of the block of cylinders. Fuel nozzles should open and be closed at strictly certain pressure. The needle of a fuel nozzle is greased with fuel which collects about a spring and goes on a returnable hose to the fuel pump.

In an inlet collector the throttle valve for improvement of overall performance of the engine on low turns is established. In each cylinder air moves on two channels in an inlet collector, in one of which the valve operated by the ECU block through the electromagnetic valve and a vacuum diaphragm is established. At turns less than 1 500 rpm valves are closed, and air arrives in cylinders only on one channel. On higher turns of the engine the ECU block opens valves therefore air arrives in each cylinder via both channels of an inlet collector.

Complete check of system of injection can be executed when using special electronic diagnostic equipment which joins in the diagnostic socket of fuel system. The diagnostic socket is located behind the central console in front of the lever of the hand brake.


Turbonagnetatel works at extremely high speeds and temperatures. Do not use a turbonagnetatel at removed any part or a hose. The extraneous particles getting on rotating blades, can damage a turbonagnetatel.

Do not increase engine turns at once after start, especially on the cold engine. It is necessary to wait at least some seconds for ensuring normal circulation of oil.

Give the chance to the engine to work in an idling mode within several minutes before switching off after operation of the engine on high turns.

For greasing of the engine use only oil of the recommended quality.