Introduction to
Huaquan Generator: Common faults of diesel engine injectors include the following:
1. Poor fuel atomization: When the fuel injection pressure is too low, carbon deposits are formed due to nozzle wear, the spring end face is worn, or the elasticity decreases, the fuel injector will open and close prematurely or delay, resulting in poor fuel atomization. This will cause a decrease in diesel engine power, black smoke from the exhaust, and abnormal machine operation sound. In addition, diesel oil droplets with excessively large particle size cannot burn fully and will flow into the oil pan along the cylinder wall, increasing the oil level, reducing oil viscosity, deteriorating lubrication, and even leading to cylinder burnout accidents.
2. Needle valve stuck: Moisture or acidic substances in diesel can cause the needle valve to rust and get stuck. After the sealing cone of the needle valve is damaged, combustible gas in the cylinder will also enter the mating surface to form carbon deposits, causing the needle valve to bite and the injector to be unable to spray oil, resulting in the cylinder stopping working. This can cause a decrease in engine power, shaking, and even inability to start.
3. Dripping of fuel injector: During the operation of the fuel injector, the sealing cone of the needle valve body will be subjected to frequent strong impact from the needle valve and high-pressure fuel injection, causing the cone to gradually wear or develop spots, resulting in sealing failure. When the temperature of the diesel engine is low, the exhaust pipe emits white smoke, and when the temperature is high, the exhaust pipe emits black smoke accompanied by a blasting sound. If the fuel supply to the cylinder is stopped, the exhaust and firing sounds will quickly disappear.
4. Excessive return oil volume: When the needle valve components are severely worn or the needle valve body is not tightly matched with the injector housing, the return oil volume will significantly increase, resulting in a decrease in injection pressure, a delay in injection time, and ultimately a decrease in engine power, which may even cause the diesel engine to stall.
5. Internal leakage of fuel injector: The needle valve frequently moves back and forth in the needle valve hole. When the diameter of impurities and particles in diesel is too large, the guide surface of the needle valve hole will gradually wear out, resulting in increased internal leakage of the fuel injector, pressure drop, and prolonged injection time, causing difficulty in starting the diesel engine and increased vibration during operation.
6. Leakage and oil leakage in the joint hole between the fuel injector and the cylinder head: If there is carbon accumulation in the installation hole of the fuel injector on the cylinder head, the copper gasket is not intact or flat, asbestos board or other materials are used instead of copper material, and the gasket thickness cannot ensure that the fuel injector extends out of the cylinder head plane, it will cause poor heat dissipation or sealing failure, resulting in leakage and oil leakage.
7. Black smoke emission: Due to the continuous injection and flushing of high-pressure diesel, the injection nozzle holes will gradually wear and expand, resulting in a decrease in injection pressure, a shorter injection distance, and uneven mixing of combustible mixture, leading to black smoke emission in the diesel engine and an increase in carbon deposits in the cylinder.
