How to Adjust Valve Clearance of Iveco Diesel Common Rail Engine

After seeing that the intake valve of the cylinder is closed, and then rotating the crankshaft for about 90 degrees, it can be adjusted that the diesel engine of the cylinder is not compression ignition, but ignition. The ignition time of diesel engine is the injection time of injector. Traditional injectors use timing gears and mechanical advancers to control the precise injection time. Now the new electronic fuel injection system uses a computer to control the injection time of the injector. The fuel injection time is slightly earlier than the ignition time.

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The working sequence of diesel engine should be: fresh air travels under the piston, and then the piston rises to compress the fresh air. With the increase of air pressure, the temperature of compressed fresh air will rise sharply, and the top dead center temperature will exceed the ignition point of diesel. At this time, the fuel injector is turned on, and the atomized diesel oil enters the combustion chamber and is ignited. Fuel injection and combustion are basically synchronized, and the fuel injection time will continue to advance slightly with the increase of speed.

Ignition time of gasoline engine is controlled by spark plug, and ignition time of diesel engine is controlled by injection time of injector.