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Causes and Emissions of Diesel Engine Knocking
The symptoms of a diesel engine knocking during operation are: from medium to low speed, a relatively heavy cylinder sound is emitted, the exhaust pipe emits black smoke, and when there is a sound of fire or fire, the engine body is overheated. There are mainly causes for knocking: The oil supply time is too early. When the upward movement of the piston of the Chai sleeve machine has not yet reached the specified fuel injection position, the fuel injector will start to inject fuel to advance the fuel combustion. The high-pressure gas in the cylinder will impact the piston, giving off a rhythmic “嗒,嗒"The crisp knock on the cylinder sounds, reducing the throttle, knocking the cylinder sound is obvious. The remedy method is: Adjust the fuel advance angle, that is, increase the gasket between the fuel injection Pump and the gear box so that the oil supply time is delayed to meet the specified fuel injection time. For every 0.1 mm increase in the gasket, the feed advance angle can be delayed by 1.3-1.7. 2. Poor fuel injection Fuel injection pressure is too low, fuel injector drip, poor fuel atomization, and late fuel supply can cause poor fuel combustion and knocking. Knocking sounds caused by such failures are deep, husky, and accompanied by engine overheating, black smoke, or exhaust pipe blasting, and fire-breathing. The injectors should be removed for inspection and adjustment, and the timing of fuel supply should be adjusted. If necessary, new parts should be replaced to meet the regulations. 3. After the oil valve wears out, the oil valve wears. On the one hand, the gap between the pressure relief ring and the valve seat inner hole increases, the sealing performance deteriorates, and the decompression effect deteriorates. On the Other hand, the residual pressure in the high pressure oil pipe is too high. Increased oil, causing fuel deflagration and knocking on the cylinder. Knocking is especially noticeable when the throttle is reduced. Exclusion method is to replace the oil valve and valve seat, the need to remind the operator to pay attention to the diesel engine is in good condition, when running at low speed, sometimes also issued a rhythmic knocking sound, which is the pressure of the gas flow during the fuel combustion is sharp The stroke caused by the increase of the generated vibration wave is the knocking mentioned above.