Mazda 626

1991-1998 of release

Repair and operation of the car

Mazda 626

+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Engines
   + 3.1. Petrol engines (1,6 and 1,8 liters)
   + 3.2. Petrol 4-cylinder engine (2 liters)
   + 3.3. Petrol V6 engine (2,5 liters)
   + 3.4. Partition of engines (1,6 and 1,8 liters)
   + 3.5. Partition of engines (2,0 and 2,5 liters of V6)
   - 3.6. Diesel engine 2,0 liters
      3.6.1. Technical characteristics
      3.6.2. Maintenance, repair
      3.6.3. Principle of operation of the diesel engine
      + 3.6.4. Gear belt, installation of phases of gas distribution
      3.6.5. System of preliminary warming up
      3.6.6. Check of the device of preliminary warming up
      3.6.7. Removal of air from fuel system
      3.6.8. Check and replacement of the electromagnetic valve of a cut-off of fuel
      3.6.9. Check and adjustment of turns of idling
      3.6.10. Removal and installation of nozzles
      3.6.11. Removal of the vacuum pump
      3.6.12. Diagnostics of malfunctions of a power supply system of the diesel engine
   + 3.7. Systems of electric equipment of the engine
+ 4. Heating and ventilation
+ 5. Fuel system
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electrical circuitries
+ 14. Useful tips


3.6.3. Principle of operation of the diesel engine


In the diesel engine air is sucked in in cylinders and there is exposed to very high extent of compression. At the expense of it temperature in cylinders increases higher than temperature of ignition of diesel fuel. Diesel fuel ignites in itself, thus spark plugs are not required here.

On the cold engine, fuel ignition temperature only due to compression cannot be reached. In this case it is made having warmed up (preheat) of the engine. For this purpose in each vortex camera of the diesel engine there is a glow plug warming the combustion chamber.

Fuel is sucked in by directly distributive fuel pump of high pressure (FPHP) from the fuel tank. The pump creates the necessary high pressure (about 130 bars) and fuel is distributed on cylinders according to the sequence of ignition. At the same time the TNVD regulator doses supply of fuel depending on extent of involvement of the accelerator pedal. At a given time diesel fuel is injected through nozzles in a forkamer of the corresponding cylinder. Depending on a form forkamer, or the vortex camera the soaked-up air as a result of compression gets whirl that promotes optimum mixing of air and the injected fuel.

Before hit in the fuel pump of high pressure fuel passes through the fuel filter. There it is cleared of pollution and water. Therefore it is especially important to merge water from the filter or to replace it according to regulations of service.

The fuel pump of high pressure does not demand service. All mobile details of the pump are greased with diesel fuel. The pump is put in action through a gear belt.

Being self-igniting, the diesel engine cannot be switched off by removal of tension of ignition and has for this purpose the electromagnetic valve. At switching off of the lock of ignition food from the valve is removed and it locks the channel of supply of fuel. Thanks to it it is guaranteed that supply of fuel is interrupted before blocking of a steering wheel at taking out of the ignition key. At start of the engine tension moves via the ignition lock switch on the electromagnetic valve and it opens the channel of supply of fuel.


During the work with the device of injection of the diesel engine observe purity.

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