Can Diesel Fuel Injectors Be Repaired?
1 Answers
Some faults in diesel fuel injectors can be repaired, such as injector dripping, poor sealing between the injector needle valve and valve body, seizure, clogging, etc. For other faults, it is recommended to contact the manufacturer's after-sales service or professionals for handling. For issues like injector dripping, poor sealing between the injector needle valve and valve body, seizure, or clogging, the injector should first be disassembled and the needle valve and valve body cleaned with clean diesel. If there are minor pitting and indentations on the sealing cone surface of the needle valve and valve body, they should be ground on specialized equipment or with wire-cutting pliers (note: grinding paste must not enter the sliding surface between the needle valve and valve body). Then, use engine oil for further grinding until the pitting and indentations on the sealing cone surface disappear and it appears black and shiny. For injectors with seized needle valves and valve bodies, first use wire-cutting pliers to remove the needle valve, then clean it thoroughly in clean diesel. Next, use a fine oilstone or sand strip to smooth out the raised areas caused by the seizure (note: do not damage other parts), ensuring the needle valve slides smoothly within the valve body. Then, use grinding paste and engine oil to grind the sealing cone surface to meet the aforementioned requirements. If there are numerous deep pits and indentations on the sealing cone surface of the needle valve and valve body that cannot be repaired, the injector should be replaced with a new one. The injection pressure and fuel atomization quality should then be adjusted on a test bench or in the vehicle to meet operational requirements.
