The Complete Guide to Diesel Test Bench Fuel Injector Maintenance: The Way of Precise Testing and Proper Maintenance

In the area of operation and maintenance of diesel test benches, the respective condition of the fuel injector is a propellant for the performance of the whole system. Thus, this condition—achieved through correct maintenance methods of the fuel injector—is a requisite for the efficient and stable operation of the diesel test bench.
I. Testing the Resistance of Fuel Injectors with Good Accuracy When injector resistance is to be measured, first, the injector’s wiring connector must be removed with due care. Then, using a multimeter—an accurate measuring device—one must measure the resistance between the injector’s terminal. When doing this, one must be sure to realize that not all injectors have the same resistance range. Low-resistance injectors should measure between 2 and 3 ohms. High-resistance ones should measure somewhere around 13 to 16 ohms. If, when you’re done, the resistance doesn’t match up with what I’ve just told you, you must replace the fuel injector. Not doing so means you’re liable to have nasty engine problems.
II. Careful Examination of the Dripping Condition of the Fuel Injector When we inspect the dripping condition of the fuel injector, we have multiple viable methods. One is using special apparatus to carry out an in-depth examination of the injection condition; another is removing the injector and the oil pipe with great care and reconnecting them to the fuel system with great attention to detail. For powering the operation, either a special wire can be used to bridge the test terminal on the diagnostic socket to a 12V power supply or a battery can be used to directly power the fuel pump. After the fuel pump begins running, close observation must be made to see if the injector has a dripping condition. If it does, and if the number of drips exceeds 1 per minute, then, without delay, the injector must be replaced to avoid excessive fuel consumption and the multiple possible failures that could result from that excessive fuel consumption.
III. Accurate Measurement and Assessment of Fuel Injector Injection Amount
To check the amount of fuel delivered by the fuel injector, you can use special equipment. If you don’t have that, though, it’s also possible to set up for a simple dripping test. When the fuel pump is running and the fuel is at the required pressure, fire the injector with a direct current from a battery and measure the amount of fuel it delivers. This is best done with a small graduated container, like you would find in the average kitchen. You could set the container up somehow near the test bench to catch the fuel on its way down. In the testing I’ve witnessed, the injector is fired for “15 seconds,” a period of time that seems to be arrived at somewhat arbitrarily. The whole procedure is supposed to be repeated 2 to 3 times for each injector to get a good average. On my watch, the injector test bench appears to be capable of testing 8 to 10 different injectors in a row, with a battery and resistor setup used for the low-resistance injectors.