Diesel Injector Nozzle L374PBD Fuel Injection Nozzle Auto Engine Systems Vehicle Parts

Diesel fuel injector nozzle working environment is harsh, long-term high temperature, high pressure and fuel corrosion, prone to various types of failure. Scientific and reasonable maintenance can not only protect the normal operation of the engine, reduce the failure rate, but also optimize the fuel economy and emissions. Therefore, it is crucial to have professional maintenance knowledge.

Fuel quality control: the selection of clean, standardized diesel fuel is the first task. Poor-quality diesel fuel contains a lot of impurities, water, is very easy to cause nozzle clogging. Regularly check the fuel tank, clean up the precipitation impurities in a timely manner to ensure that the fuel into the injection system is pure.
Filter maintenance: High-quality diesel fuel filters are the “protector” of fuel nozzles. Strictly according to the manufacturer's recommended mileage or working hours to replace the filter element, to prevent impurities from breaking through the defense into the fuel nozzle. Routinely check the filter housing for damage and good sealing to ensure the filtering effect.
Running status monitoring: Pay attention to the color of the exhaust smoke, power output, idling stability, etc. when the engine is working. Black smoke, lack of power, idle speed shaking and other abnormal phenomena may suggest that the nozzle failure, need to be investigated in time to avoid worsening the problem.

Visual inspection: regularly disassemble the injector and observe the appearance of the nozzle. If there is carbon buildup around the nozzle hole, needle valve head wear marks, indicating that the injection atomization or sealing problems. At the same time, check the nozzle and injector body connection parts have no signs of loosening, leakage.
Pressure test: Use professional injection pressure test equipment to detect the opening pressure of the nozzle and spray pattern. The opening pressure deviates from the standard value, which will lead to uncontrolled fuel injection; uneven spray, line rather than fog, which affects the combustion efficiency. According to the test results to determine the needle valve spring elasticity, the degree of spray hole blockage and other details of the failure.
Flow test: Compare the fuel flow of each injector under the same working conditions, too large a deviation means that the nozzle injection is inconsistent, resulting in an imbalance in engine operation. Abnormal flow rate may be caused by needle valve stagnation, uneven wear and tear of the injection holes.

Cleaning: When the diagnosis of fuel nozzle clogging, the use of special cleaning agent soaking, with ultrasonic vibration, the depth of the nozzle to remove carbon and impurities. Blow dry with compressed air after cleaning to ensure that there is no residual foreign matter inside.
Needle Valve Repair: If the needle valve is stuck or worn, the needle valve and valve seat assembly should be disassembled. Minor wear can be used to fine grinding paste grinding surface to restore the sealing; serious wear, replace the new product. When installing, pay attention to adjust the needle valve spring preload to the standard value to ensure accurate opening pressure.
Sealing test: reassemble the injector after repair, carry out the sealing test, hold the pressure for a certain period of time under the specified pressure, and observe whether there is any dripping phenomenon of the oil nozzle. Only through the strict sealing test nozzle, can be installed and used to protect the reliable operation of the engine.

Diesel injector nozzle repair and maintenance is a fine and critical work, requiring maintenance personnel to have solid professional knowledge and rigorous attitude. Through the implementation of routine maintenance, accurate fault detection and standardized professional maintenance, can effectively protect the performance of the nozzle, lay the foundation for the efficient operation of diesel engines, play a positive role in energy saving and emission reduction, enhance the reliability of the equipment, and help the related industries to develop steadily.