Diesel Injector Fuel Injector 0445120130 Bosch for Delong Weichai Wd10

INJECTOR TIPS

1.Needle valve and needle valve guide surface wear

Due to the frequent reciprocating movement of the needle valve in the needle valve hole, and the intrusion of impurities in the diesel oil into the guide surface of the needle valve, the matching gap gradually increases or scratches appear due to strain, and the oil leakage of the injector increases. The pressure drops and the fuel injection volume Reduced, fuel injection time lags, resulting in difficulty in starting the diesel engine and power drop. In severe cases, the locomotive cannot work, and the needle valve coupling with excessive wear should be replaced.

2.Orifice expansion

The injection hole of the needle valve will gradually expand under the high-pressure oil flow, which will cause the injection pressure to drop, the injection distance to be shortened, and the atomization to be poor. increase. For pintle injectors, if the wear of the nozzle hole is not serious, a steel ball with a diameter of 4mm can be placed at the end of the hole, and lightly tapped with a small hammer to make the nozzle hole plastically deform and reduce the hole diameter. If the nozzle hole wears too much, the needle valve coupling should be replaced.

3.Needle body end face wear

Because the end face of the needle valve body is impacted by the high-speed reciprocating motion of the needle valve for a long time, it will gradually wear out and form pits. Thereby increasing the lift of the needle valve and affecting the normal operation of the injector. A jig can be used to clamp the needle valve body to a grinding machine to grind the end face, and finally grind it on a glass plate with a fine grinding paste to make the roughness above Ra0.1.