Diagnosis and treatment method of abnormal noise during ignition of diesel generator.

    When the 50kw diesel generator is ignited, a sharp, uninterrupted metal sound is emitted; it is more obvious and accompanied by mechanical vibration when idling or with a small load; when a large load is at a high speed, the sound is greatly reduced, and the operation tends to be stable. What's going on in this situation? How to deal with this situation?

    Method 1: The ignition roar of the diesel generator is initially judged as a fault phenomenon, and the working temperature can be checked first, and then the fuel supply time (fuel injection advance angle) and quality can be checked.
    Method 2: Pass the half-cut oil test, that is, loosen the joint of the high-pressure oil pipe of the injector, and spray part of the oil to the outside to reduce the oil supply in the cylinder. If the sound and exhaust smoke disappear, it means that the ignition sound is caused by the oversupply of the cylinder.
    Method 3: If the semi-oil-cut test is used, the sound will only weaken but not disappear, and disappear completely after the oil is cut off. It means that the sound is caused by the advance of the cylinder oil supply time or the poor atomization quality of the injector. Pay attention to checking the fuel supply time of the cylinder (interval with the first cylinder fuel supply) and the injection state of the fuel injector of the cylinder.
    Method 4: Due to the excessive fuel supply of individual cylinders, it is also possible to touch the exhaust pipe of the corresponding cylinder block after a cold start, and there will be noise when the load is large; touch the lower part of the injector and feel that the temperature is hotter than other cylinders, indicating that the cylinder has too much fuel supply. You can also hold the high-pressure oil pipe by hand, and if the pulsation is large, it means that the oil cylinder is supplied with too much oil.
    Method 5: The fuel supply volume of a single cylinder is too large and the fuel supply time is too early. The fuel injection pump should be moved to the test bench, the fuel supply volume and fuel supply advance angle of the cylinder should be adjusted, and the fuel supply volume and fuel supply of each cylinder should be checked. Oil advance angle, oil supply interval angle.