Diesel injection pump plunger sticking fault
The diesel engine injection pump plunger often shows sticking fault in actual operation, causing poor combustion in the engine combustion chamber and uneven fuel injection, which will cause an increase in exhaust smoke and power output. In order to eliminate the fault, not only a clear understanding of the relevant causes of the fault is required, but also a comprehensive inspection must be carried out and the corresponding measures taken to solve the problem.
Factors causing diesel engine injection pump plunger to stick
1. Low fuel temperature. The viscosity of diesel at high temperature is much lower than at low temperature, so when the fuel temperature is too low, the fuel is extremely viscous and easy to agglutinate.
2. Contamination of injector. When the fuel is contaminated with impurities, it is easy to agglutinate or glue together, and the fuel is not easy to pass through the plunger and make the plunger stuck.
3. Poor manufacturing quality. If the clearance between the fuel metering pin of the plunger and the plunger cylinder is too large or the surface coating is thicker, the fuel is not easy to pass through and the plunger is stuck.
4. Poor maintenance. When the fuel system is not cleaned for a long time, the fuel accumulates sediment and debris, which is easy to cause the plunger to stick.
5. Improper maintenance. Improper disassembly, reassembly, and assembly methods can lead to inaccurate assembly, spring failure, and seal damage. Wrong test results can lead to sticking of the plunger.
Troubleshooting diesel engine injection pump plunger stuck
1. Remove dirt and dirt. The service personnel can adopt the combination of hot water and additives to make the fuel clear, and observe the dirt and dirt floating on the surface of the fuel.
2. Replace the filter element. Replace the filter element to ensure that the fuel is free of mechanical impurities.
3. Replace high-quality diesel. Replace it with high-quality diesel meeting the standards, or use heating systems or other methods to warm the diesel in winter.
4. Increase the assembly pressure. Increase the injected fuel pressure to push out the debris in the plunger cylinder and increase the injection speed.
5. Check the combination of parts. When the plunger and plunger cylinder are separated, check the stopper, spring force, mating clearances of each part and the degree of wear; if the relevant parameters meet the requirements, the combination can be used, otherwise it must be replaced.
6. Check the installation and test. Take suitable measures to avoid displacement, displacement, and extrusion when installing the plunger and plunger cylinder. Check the corresponding parameters before and after the test; if the parameters meet the requirements, the performance is normal, otherwise additional measures should be taken.
In order to eliminate the fault of diesel engine injection pump plunger stick reliably, the specific causes of the fault should be carefully identified and the corresponding solutions should be adopted. In addition, regular maintenance and routine testing should be performed to prevent the fault.
