Nowadays, diesel generator is widely used in many fields. Fuel injection nozzle, as one of the main equipment of diesel generator, there will be a burning fault after using it a period of time. Next, we mainly talk about the reasons for fuel injector burning.
Fuel injector working principle
Smptoms of a potential problem with a fuel injector
1. Engine misfires and decrease in power, acceleration, and fuel efficiency
One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. If any of the vehicle’s fuel injectors have an issue, the air fuel ratio of the engine will be upset, which can result in performance problems. A faulty fuel injector can cause the vehicle to experience misfires, a loss in power and acceleration, a reduction in fuel efficiency, and in severe cases can cause stalling or prevent the engine from running at all.
2. Fuel odor
Another common symptom of a potential issue with a fuel injector is a fuel smell. Injectors hold high pressures which over time can cause them to leak at the nozzle or at the seal that is located at the tip of the injector. A leaky injector will excess fuel into the combustion chamber of the engine, while a leaky seal will leak fuel at the base of the injector. Both can affect engine performance, specifically fuel efficiency, and both will usually produce a noticeable fuel smell. Any sort of fuel smells should be addressed as soon as possible in order to prevent them from becoming a potential safety hazard.
3. Check Engine Light comes on
Another symptom of a potential issue with a fuel injector is an illuminated Check Engine Light. If any of the fuel injectors become clogged and cause a misfire, or experience an electrical issue the computer will set off the Check Engine Light to alert the driver of the issue. The Check Engine Light can also be activated by a wide variety of other engine management issues, so having the computer scanned for trouble codes is highly recommended.
Because of their role as the nozzles that provide the fuel that allows the engine to run, fuel injectors are a very important component to the overall operation and drivability of the vehicle. If your vehicle is displaying any of the symptoms above, or you suspect that your vehicle may be having an issue with one of the fuel injectors, have the vehicle diagnosed by a professional technician, such as one from YourMechanic, to determine if any of the fuel injectors need to be replaced.
The injector atomizes the diesel fuel and sprays it into the combustion chamber. The injector consists mainly of the nozzle and nozzle holder. The main parts of fuel injector are as follows:
1. Rod type filter
2. Cap nut
3. Compressing spring
4. Compression pin
5. Cap nut for fixed nozzle
6. Nozzle holder
7. Connect hole for fuel delivery
8. Nozzle holder
9. Connect tube for overflow
10. Shim
11. Pin
12. Nozzle bush
There is no doubt that fuel injection nozzle burning will definitely influence the normal operation of generator set. If you find the related causes, you can quickly solve the problems.
1. Long time idling operation
Due to the diesel engine keeps running slowly for a long time, the temperature in the cylinder is low, the fuel combustion is not sufficient, the combustion chamber and fuel injection nozzle are easy to form carbon deposition. So it leads to the deterioration of working conditions for fuel injection nozzle. Especially in winter, it is even more serious under the condition of cold climate. Because the combustion chamber has carbon deposition, heat dissipation is slow, which may cause spray orifice obstruction of the fuel injection nozzle and the oil drip phonomenon may happen. The fuel stays in the nozzle head for a long time, the local high temperature will make the nozzle and thermal insulation jacket burned.
2. The fuel is not clean
Due to there are small particles of impurities in the fuel, the needle valve and needle valve body of the fuel injector will wear. It is possible that the needle valve will be stuck in the needle valve body.Because of needle valve lag, the fuel can’t be periodically, quantitatively and quickly sprayed into the combustion chamber, the oil drip phenomenon will appear, which may cause the fuel atomization is not good and the combustion speed is reduced. Due to the burning time of the nozzle is extended, which will make the fuel injection nozzle and the thermal insulation jacket burned. When such fault occurs, there will be black smoke and chattering phenomenon.
3. Fuel injection time is too late
The fuel injection advance angle is too small which may cause the fuel injection time is too late. If it can’t be adjusted for a long time, the local high temperature will make the fuel injection nozzle and thermal insulation jacket burned.
4. Improper assembly
If the nozzle insulation sheath is installed without cleaning, there will be a gap between the fuel injection nozzle and the insulation sheath. The gas enters into the gap, the heat insulation and cooling effect is reduced, which will cause the fuel injection nozzle and the insulation sheath burned. If the thermal insulation sheath is too tight, the nozzle will generate additional stress. Under the combined action of heat alternating load and high pressure of fuel injection, the nozzle will be broken and the needle valve will be stuck. In addition, if the insulation sheath can’t get installed during maintenance, the nozzle extends into the combustion chamber more than 4mm above the cylinder head bottom, the heat absorbed by the fuel injection nozzle will increase, which make the nozzle melted.
5. Improper use of generator set
If it lacks of coolant liquid while the diesel generator set is at work, the combustion chamber can’t be in good state of cooling, which will lead to the high temperature. This is also an important reason to cause the burning of fuel injection nozzle.
Prevention
As mentioned above, the fuel injection nozzle is one of the important equipment of diesel genset. For the nozzle maintenance, it is necessary to keep the fuel system clean and avoid purchasing the fuel from unreliable sources.
We supply multiple brands of generator set, such as: Cummins, Volvo, Deutz, Doosan Daewoo, MTU, Ricardo, Perkins, Shangchai, Weichai, Yuchai etc. The style of genset is varied, such as: container genset, trailer genset, portable trailer genset, soundproof genset, low noise genset, and silent genset, etc. Besides, we also supply design and construction of the noise reduction project up to the customer's requirements.
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