1. Mechanical failure: After long-term use, the injection pump drive coupling is loose or the gap is too large, the drive gear is worn, and the side clearance increases, which will affect the uniformity of oil supply in each cylinder. In addition, the high-pressure oil pipe joint leaks due to frequent vibration or insufficient tightening, and the metal of the joint falls off and blocks the oil pipe due to excessive tightening force, which will also cause uneven oil supply in each cylinder.
2. Debugging problem: When debugging on the test bench, the length, shape, and caliber of the injector and high-pressure oil pipe used are not completely consistent with the original machine, and the difference in debugging technology leads to uneven oil supply in each cylinder after installation of more than 3%. In addition, the difference between debugging status and use conditions will also lead to uneven oil supply. For example, the test bench debugging is carried out at room temperature, while the installation is under high temperature and high pressure environment, which will cause the viscosity of diesel to decrease, internal leakage to increase, and the amount of oil return to increase, thereby affecting the uniformity of oil supply.
3. Fuel quality issues: Excessive impurities and moisture in the fuel will lead to incomplete combustion, which in turn causes uneven fuel supply.
4. Plunger spring failure: The plunger spring is subjected to strong force, has large deformation, has a high working frequency, and is easy to break. In mild cases, it will lead to reduced injection volume, uneven injection volume of each cylinder, excessive injection interval time of each cylinder, and delayed injection start time; in severe cases, the fuel supply is interrupted or even cannot be supplied
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