Testing fuel injector
A fuel injector is an integral part of combustion engine all diesel engines use fuel engines by design. It is a complex architecture and requires cleaning followed by testing. Testing of the fuel injector is carried out as mounting the fuel injector in its test rig and connects up the oil supply. It should be carried out very carefully because the high-velocity oil jet can penetrate the skin and cause blood poisoning. With the injector priming valve open, operate the hand pump to prime the injector.
Later the pump is operated rapidly for several strokes. The injector should open with a high pitched chatter and fuel should be emitted in a fine cloud. To test the tightness between the nozzle needle and seat, operate the hand pump slowly to gradually increase the pressure until it is just below opening pressure. Maintain the pressure for few seconds and make sure injector is not dripping. When nozzles are cooled internally, these spaces should be pressure tested to check for tightness.
Blank off one of the fuel valve cooling connections and fill the injector cooling space with water or fuel, depending upon the cooling medium. Then connect a low-pressure air supply to the other connection. Leave the air on for a short period of time and test for internal or external leakage. Testing of a fuel injector is usually carried out at an interval of 2000 running hours for marine diesel engines. Some points to be remembered while testing of fuel injector
1. Examine the injector after it is taken out from the cylinder head. Pressure test and find opening pressure in service.
2. Check the injector setting pressure, formation and accumulation of carbon, corrosion at the nozzle.
3. Assessment of spray pattern and quick re-seating.
4. Drip-proof and there should be no droplet formation at set pressure minus 10 bar.
5. Only recommended assembly technique should be followed and parts should be handled carefully.
6. It must be operated under favorable conditions.
A fuel injector is the result of years of hard work and innovation of engineers and researchers to develop and make t even more resilient in its processing. Earlier the fuel injectors were mechanical injection but in last few decades technology has made it even more powerful. With the inception of electronic injection, the combustion process has been improved. Fuel injectors require regular cleaning service in order to perform smoother. Cleaning is generally required complete servicing of the complete engine. Aside, fuel injectors play a significant role in aero engines too.
Fuel injector Testing in USA is done by the professional who has years of experience in the functioning of the injector. There are many companies out there in the USA which provide optical patternators. They work well with a different kind of fuel injector. It is reliable, accurate and reproducible making it ideal for quality audit of nozzles and deliver a fully customized solution for end to end testing.
