Excavator Parts C15 injectors 211-3025 Fuel Injection For CAT Truck Spare Engine Parts

1. The needle valve and the guide surface of the needle valve are worn
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. Expand the spray hole
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. Poor atomization of the injector
When the fuel injection pressure is too low, the nozzle hole is blocked by carbon deposits, the end face of the spring is worn or the elastic force is insufficient, the fuel injector will be opened early and closed late, resulting in poor atomization of the fuel injector and making the single-cylinder diesel engine unable to continue to work. The power of the multi-cylinder diesel engine drops, and the exhaust emits black smoke.