Opel Omega

since 1993-1999 release

Repair and operation of the car

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. 2,0 liters diesel engine
   - 5.3. Diesel V6 engine of 2,5 liters
      5.3.1. Principle of operation of the diesel engine
      5.3.2. Turbocompressor
      5.3.3. System of recirculation of the fulfilled gases (EGR system)
      5.3.4. Device of preheat of diesel engines
      5.3.5. System prednakala/glow plugs
      5.3.6. Relay of system of preheat
      5.3.7. Removal of air from a power supply system
      5.3.8. Fuel Pump of High Pressure (FPHP)
      5.3.9. Nozzles
      5.3.10. Check / adjustment began giving of TNVD
      5.3.11. Inlet collector
      5.3.12. Main malfunctions of diesel system of injection
      5.3.13. System of production of the fulfilled gases of diesel engines
+ 6. System of start of the engine
+ 7. System of ignition
+ 8. Coupling
+ 9. Transmissions
+ 10. Main transfer, half shafts
+ 11. Brake system
+ 12. Suspension bracket and steering
+ 13. Body
+ 14. Body electric equipment

5.3.2. Turbocompressor


The diesel OMEGA engine is equipped with a turbocompressor. In a turbocompressor both turbine wheels are located on one shaft, but in cases independent from each other. Turbine wheels are put in action by exhaust gases. Wheels rotate a shaft with a speed up to 120 000 rpm. As the exhaust and soaking-up rotor are on one shaft, fresh air is pumped in cylinders with a constant speed of rotation.

Owing to the high volume efficiency (E) the power gain in such engines makes up to 100%. Increase in power is influenced by the pressurization pressure which in engines of cars lies ranging from 0,4 to 0,8 bars (pressure in tires about 1,8 bars). If pressure of pressurization exceeds the value established by the manufacturer, then in this case the valve opens perepuskny, and pressure decreases.

Along with engine capacity existence of a turbocompressor increases also torque that first of all well influences smoothness of operation of the engine. Unlike petrol engines because of pressurization in diesels it is not required to lower a compression as and on low turns injectable fuel is completely run.

The turbocompressor is an element which has to work with high precision. Therefore the expert is recommended to repair it only. As a rule, in case of malfunction of a turbocompressor it is replaced in a set.