High Quality Diesel Injector 0445120057 0 445 120 057 Fuel Injector For IVECO Diesel Engine Spare Part

Reasons for the decrease in service life of common rail injectors
(1) During the maintenance process of the fuel injector, many maintenance personnel consider saving costs, and sometimes they do not replace the nozzle, but only the valve assembly. range, exceeding the maximum value. At this time, in order to adjust the fuel injection quantity of the injector to the standard range, the maintenance personnel will adjust the fuel injection quantity at the full load point by adjusting the lift of the needle valve. The adjustment range of the needle valve lift should not be too large, otherwise Will completely change the injection characteristics of the injector. The armature lift of the injector is adjusted to the upper limit value, or even exceeds the required upper limit value, which will cause greater movement impact during the working process of the injector, and the seat surface of the valve sleeve is more prone to fatigue and repeated damage. If forcibly adjusting the lift of the needle valve, the static full-load point fuel injection volume can indeed be adjusted to the standard range, but the dynamic injection characteristics of the injector have changed a lot, and the injector enters the linear stage Obviously ahead of time, it is easy to cause engine knocking, high fuel consumption or poor starting performance.
(2) The main cause of failure of the failed injector was found to be cracking of the valve seat during maintenance, as shown in Figure 5. The main reason for the cracking of the valve seat is that it is not cleaned cleanly during maintenance. After tightening, the stress is concentrated, the force on the valve seat is uneven, the valve seat cracks after a period of use, and the maintenance is not standardized. The tightening torque of the valve seat fastening nut is too large, which leads to fatigue and cracking of the valve seat.