Mazda 626

1991-1998 of release

Repair and car operation

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 of 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 a gazoraspredeleniye
      3.6.5. System of preliminary warming up
      3.6.6. Check of the device of preliminary warming up
      3.6.7. Air removal from fuel system
      3.6.8. Check and replacement of the electromagnetic valve of an otsechka 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 semi-axes
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electroschemes
+ 14. Good advice

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 the temperature in cylinders raises above temperature of ignition of diesel fuel. Diesel fuel ignites in itself, thus spark plugs here are not required.

On the cold engine, only at the expense of compression it is impossible to reach temperature of ignition of fuel. In this case it is made having warmed up (preheat) of the engine. For this purpose in each vortical chamber of the diesel engine there is a glow plug which is warming up the chamber of combustion.

Fuel is sucked in by directly distributive fuel pump of a high pressure (TNVD) from a fuel tank. The pump creates a necessary high pressure (near the 130th bar) and fuel is distributed on cylinders according to sequence of ignition. At the same time the regulator of TNVD doses out supply of fuel depending on extent of involvement of a pedal of gas. At a given time diesel fuel is injected through nozzles in a forkamer of the corresponding cylinder. Depending on a form forkamer, or the vortical chamber soaked-up air under the influence of compression gets whirl that promotes optimum mixing of air and the injected fuel.

Before hit in the fuel pump of a 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 service regulations.

The fuel pump of a 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-flammable, 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 a food from the valve acts in film and it locks the channel of supply of fuel. Thanks to it it is guaranteed that supply of fuel interrupts before blocking of a steering wheel at an ignition key vynimaniye. At engine start tension moves via the switch of the lock of ignition on the electromagnetic valve and it opens the channel of supply of fuel.


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