Diesel Engine. General Information (Audi 80 B3)

In a diesel engine, fresh air is sucked into the cylinders, where it is highly compressed. This causes the temperature in the cylinders to rise above the ignition temperature of the diesel fuel. When the piston is near its top dead center and the air is highly compressed and heated to a temperature of about 600°C, diesel fuel is injected. The fuel ignites on its own. That is, spark plugs are not required.

On a very cold engine, it often happens that the compression does not provide the combustion temperature. In this case, the engine needs to be warmed up. For this purpose, a glow plug is installed in each swirl chamber. heating the combustion chamber. In addition, the diesel engine has a device for accelerating the start of a cold engine, which is controlled by the traction button - the piston of the injection regulator of the high-pressure fuel pump moves approximately 2.5° in the direction of earlier injection. Due to this, the fuel is injected with hot air earlier, and the cold engine starts easier. As soon as the engine warms up to its operating temperature, it is necessary to completely press the traction button.

This chapter only covers the specifics of diesel engine repair. All other operations are similar to those of a gasoline engine and should be viewed in previous chapter.

(The original article is available on the website: «AudiManual»)