The injector valve assembly plays a vital role in the fuel injection system, but it is also prone to some failures during long-term use.

One of the common failures is injector clogging. This may be due to impurities in the fuel, gums or moisture accumulated in the valve assembly, resulting in smaller spray holes or even complete blockage. The fault manifests itself in the form of decreased engine power, unstable idling, increased fuel consumption, and so on. When repairing, you can first use special injector cleaner, remove the injector from the engine, connect the cleaning equipment, and use the high-pressure pulse of the cleaner to flush the inside of the spray hole and valve assembly to remove impurities. If the clogging is serious, it may be necessary to disassemble the injector and manually clean and grind the needle valve and valve seat to restore its original precision and sealing.

Stuck needle valves are also a more common failure. This can be due to high temperatures, carbon buildup, or spring fatigue that prevents the needle valve from opening and closing flexibly. Symptoms include engine shuddering and difficulty starting. The way to deal with this is to first check if the spring is flexible and replace it if necessary. For the stuck needle valve, it can be soaked in a special cleaner, with a soft tool to gently dial the needle valve, so that it restores the flexible movement, and at the same time, clean up the valve seat surface carbon and dirt, to ensure that the needle valve and the valve seat with a good fit.

In addition, injector leakage is a problem that should not be ignored. Deteriorated seals, worn needle valves or damaged seats can cause fuel leaks. This can result in wasted fuel, engine compartment odors, and a possible fire hazard. When servicing, seals need to be carefully inspected and replaced if damaged. Needle valve and seat wear can be repaired by grinding in minor cases or replacing the entire valve assembly in severe cases.

When repairing the injector valve assembly, the operator needs to have professional knowledge and skills, use appropriate tools and equipment, and operate in strict accordance with the maintenance specifications. At the same time, in order to reduce the occurrence of failures, the daily use of qualified fuel should be used, regular maintenance and inspection of the injector to ensure that it is in good working condition, so as to protect the normal operation and performance of the engine.