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The principle of operation of the diesel engine
In a diesel engine air is sucked into the cylinders and there subjected to a very high degree of compression. Due to this, the temperature in the cylinder rises above the ignition temperature of diesel fuel. Diesel fuel is ignited by itself, so a spark plug is not required. On a cold engine, the ignition temperature of the fuel only at the expense of compression can not be achieved. In this case, display is made (Preheat) engine. For this purpose, each swirl chamber diesel engine has a glow plug is heated by the combustor. Fuel is sucked directly distributing high pressure fuel pump (fuel pump) from the fuel tank. The pump creates the necessary high pressure (about 130 bar) and fuel is distributed to the cylinders in accordance with the sequence of ignition. At the same time the regulator pump dispenses the fuel supply as a function of the degree of involvement of the gas pedal. At some point diesel fuel is injected through nozzles into a chamber of the cylinder. Depending on the shape of the prechamber or swirl chamber intake air under compression becomes whirling motion, which contributes to an optimal mixing of air and fuel injected. Prior to entering the high pressure fuel pump fuel passes through the fuel filter. There it is cleaned of dirt and water. It is therefore particularly important to drain the water from the filter and replace it according to the rules of service. High pressure fuel pump does not require maintenance. All moving parts are lubricated by diesel fuel pump. The pump is driven via a toothed belt. As pyrophoric, the diesel engine can not turn off the ignition and removing the voltage is for this solenoid valve. When you turn off the ignition power is removed from the valve and it closes the fuel supply passage. This ensures that the fuel supply is interrupted to the steering lock when the ignition key is removed. When starting voltage is applied to the motor via a switch on the ignition solenoid valve and it opens the fuel supply passage.
A warning  When working with the unit injection diesel engine, observe cleanliness.
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