The poor fuel injection quality of diesel generators includes poor atomization of the fuel injection nozzle, incorrect spray shape, and inability to stop fuel injection quickly (there is still dripping after stopping), etc.
-
Reasons for the wrong spray shape
1. The nozzle holes and shaft needles of diesel generator nozzles are worn unevenly or there are carbon deposits at the nozzle holes.
2. The injection pressure is too large or too small.
-
Reasons for poor atomization
1. The elastic force of the spring for adjusting the injection pressure is weakened or broken so that the injection pressure is too low.
2. The nozzle holes are worn, carbon deposits are blocked or burnt out.
3. The needle valve and the needle valve body are not tightly sealed.
4. Carbon deposits jam the needle valve, or overheating makes the needle valve bite in the open position and poor atomization.
-
Reasons for not stopping fuel injection (dripping) quickly
1. The elastic force of the spring for adjusting the injection pressure is weakened or broken so that the injection pressure is too low.
2. The needle valve and the needle valve body are not sealed.
3. The needle valve is stuck by carbon deposits or stuck in the open position.
4. The delivery valve is not closed tightly or the delivery valve pressure reducing ring is worn.
Poor fuel injection quality will result in incomplete combustion. It makes it difficult to start the generator set. After starting, the output power drops, the fuel consumption increases, the speed is unstable, the diesel leaks into the crankcase to dilute the engine oil, the exhaust gas emits black smoke, and the unit is easy to stop at low speeds, sometimes there is a knocking sound.
