Diesel Injector Fuel Injector 0445110486 Bosch for Yuchai Engines

b. If the injection time is too late, that is, the injection advance Angle is too small and cannot be adjusted for a long time, the combustion situation will deteriorate and the combustion duration will be too long, which will cause local high temperature, burning and melting injection nozzle and jacket.

c. Fuel is not clean, small and medium-sized particles of fuel will make the nozzle needle valve and valve body serious wear, serious clockwise valve stuck in the valve body. Because of the needle valve hairpin, can not be normal oil supply, such as fuel can not be timed, quantitative quickly injection into the combustion chamber, there will be dripping oil or injection oil phenomenon; Due to bad atomization, can not be well mixed with air, and quickly, fully combustion. When this kind of failure occurs, the engine jitter, this time the nozzle and the jacket is the most easy to melt.

d. During assembly, if the sheath is installed too tightly, additional stress will be generated on the nozzle. Under the combined action of thermal alternating load and fuel injection high pressure load (22.5 10.0.5mpa), it is easy to cause the nozzle head to crack, needle valve hairpin and drop oil, resulting in local high temperature and melt the nozzle; If not installed sheath, will make the nozzle into the bottom plane of the cylinder head more than 4 mm, the fuel injection head absorb heat increase, needle valve is easy to jam, the nozzle is easy to melt.

e. In the high temperature operation of the engine, the coolant supply is insufficient, and it is easy to burn the nozzle and jacket, and even lead to the "cylinder pulling" accident.

To sum up, the early failure of the nozzle is mostly due to improper use and maintenance of the nozzle.