The Fuel Injector nozzle receives the Fuel Injector pulse signal sent by the ECU and precisely controls the Fuel Injector quantity. The Fuel Injector is a precision device with very high machining accuracy, which requires a large dynamic flow range, strong anti-clogging and anti-pollution capabilities, and good atomization performance.
How do we check the Fuel Injector of the excavator?
How to solve the problem of oil dripping from the excavator's Fuel Injector nozzle?
How do excavators see the failure of the piston of the high pressure pump of the Fuel Injector nozzle or the oil outlet valve?
How do we check the Fuel Injector of the excavator?
First check the injection pressure and tightness of the Fuel Injector. Secondly, check the atomization quality of the Fuel Injector, carefully observe the shape, number, oil droplet fineness and distribution of the spray column, and pay attention to whether fuel drips at the nozzle bore before valve opening pressure and after injection. Good atomization quality means that the spray column meets the requirements, no oil droplets splash or leak and the entire spraying process is accompanied by a crisp "squeak" noise.
How to solve the problem of oil dripping from the excavator's Fuel Injector nozzle?
When the Fuel Injector is working, the sealing cone of the needle valve body is frequently and strongly impacted by the needle valve. In addition, the high-pressure oil flow is continuously sprayed from there, and on the cone surface notches or spots gradually appear, causing the seal to be lost and the Fuel Injector to drip. When the temperature of the diesel engine is low, the exhaust pipe emits white smoke, and when the engine temperature rises, it turns into black smoke, and the exhaust pipe emits an irregular explosion noise.
Solution: The Fuel Injector can be disassembled, and a little chromium oxide fine grinding paste is applied to the head of the needle valve (make sure it does not poke into the hole of the needle valve) to sand the cone surface, and then wash it with diesel oil and put it into the Fuel Injectorfor testing. If it is still not qualified, the needle valve coupling must be replaced.
How do excavators see the failure of the piston of the high pressure pump of the Fuel Injector nozzle or the oil outlet valve?
Due to the oil quality, working hours and premature maintenance, the Fuel Injector needle valve jams, the atomization of the Fuel Injector is poor, and the injection pressure is incorrect, resulting in insufficient fuel combustion in the cylinder and a large amount of fuel black smoke.
Assessment method: Start the diesel engine at low speed, turn off the oil cylinder by cylinder and observe the change in the smoke at the exhaust pipe outlet. valve or Fuel Injector).
After making sure there is a problem with the fuel supply system of this cylinder, replace the Fuel Injector nozzles with other cylinders and observe the changes in smoke generation. If the smoke level is significantly reduced or disappeared, this proves that the Fuel Injector of this cylinder is defective and the Fuel Injector needs to be repaired or the Fuel Injector assembly replaced; If the smoke level does not obviously change, it can be concluded that the cylinder of the high pressure pump piston or the oil outlet valve is defective, the assembly of the damaged parts must be replaced, and the high pressure pump adjusted and tested to confirm that the high pressure pump reaches the normal working level.
Guangzhou HERUI has been focusing on the production of Fuel Injectors for several years, with the variety of high quality products Guangzhou HERUI offers, they are confident that we will become your ideal partner.