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
   - 5.3. Diesel V6 2,5-liter engine
      5.3.1. Principle of operation of the diesel engine
      5.3.2. Turbokompressor
      5.3.3. System of a retsirkulyatsiya 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. Air removal from a power supply system
      5.3.8. Fuel pump of a high pressure (TNVD)
      5.3.9. Nozzles
      5.3.10. Check / adjustment of the beginning of 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. 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

5.3. Diesel V6 2,5-liter engine

5.3.1. Principle of operation of the diesel engine


Impellent compartment of a diesel dvinatel with DDE 2.1 regulator

1. Pulse sensor of a cranked shaft
2. The sensor of temperature of cooling liquid
3. Sensor of temperature of the forced
4. Sensor of pressure of forcing
5. The switching valve of a retsirkulyatsiya of OG
6. DDE 2.1 monitor
7. Fuel pump of a high pressure (TNVD)

In the diesel engine in cylinders подсасывается clean air also is exposed to strong compression. Thanks to it air temperature in cylinders rises above temperature of ignition of diesel fuel. When the piston is slightly above from VMT, in strongly compressed and warmed up to +600 ° About air diesel fuel is injected. Diesel fuel ignites itself, spark plugs are not required.

At very cold engine the temperature of ignition is not reached by only one compression.

In this case the engine needs to be warmed up previously. For this purpose in each vortical chamber there is a glow plug which warms up air in the combustion chamber. In order that the cold engine worked better, fuel is injected into hot air earlier. As soon as the engine reached working temperature, the injection moment automatically moves back. Regulation of the beginning of injection makes DDE monitor (DDE = Digital Diesel Electronic), and also regulation of number of injection and pressure of pressurization for a turbokompressor.

Fuel moves from a fuel tank submitting fuel pump, and also TNVD to the engine. In TNVD the high pressure near the 160th bar and fuel according to an order of ignition is created distributed on separate cylinders. The injected amount of fuel is defined by DDE monitor, at respective impact on a pedal of gas, whose situation is traced by a potentiometer. Through nozzles diesel fuel moves during certain time in vortical chambers of the corresponding cylinders. At a compression stage soaked-up air gets a certain whirl in a form of the vortical chamber and, thus, optimum mixes up with injected fuel.

Before fuel gets to TNVD, it passes through the fuel filter. There it is cleared of dirt and water. Therefore it is important to replace the fuel filter according to recommendations about maintenance.

TNVD does not demand service. All mobile parts of the pump are greased with diesel fuel. The pump is put in action by cranked shaft through a chain.

As the diesel engine represents the device with self-ignition of fuel and at tension interruption in ignition system it is not switched off, it is equipped with the electromagnetic valve. At switching off of ignition tension on the electromagnetic valve is disconnected, and the valve blocks the fuel channel. Thanks to it fuel interruption of supply before locking of the lock of a steering column is provided. At engine start by the starter switch on the electromagnetic valve tension and by that the fuel channel opens moves.

The monitor of DDE watches and prevents malfunctions in injection system. Masterful firms OPEL can provide the device for finding of malfunctions which is connected to a monitor, interrogates and reads out malfunctions.