Why does the diesel generator set suddenly stall

1. When automatic flameout occurs, the speed gradually decreases. There is no abnormality in the sound of the diesel generator and the color of the exhaust smoke. The main reason is that the diesel in the fuel tank has been used up, which may be because the fuel tank switch is turned on; or the vent hole of the fuel tank, the fuel filter and the fuel transfer pump are blocked; or the oil line is not sealed and air enters, causing "air lock" (before flameout) Accompanied by unstable speed) At this time, the low-pressure oil circuit should be checked. First, check whether the fuel tank, filter, fuel tank switch, and fuel transfer pump are blocked, lack of oil, or the switch is not turned on, etc., and then loosen the air on the fuel injection pump. screw, press the fuel pump button and observe the oil flow at the bleed screw. If no oil flows out, the oil circuit is blocked. If there are bubbles in the oil flowing out, air has entered the oil circuit. Segment check excluded.
2. When automatically shutting down, the operation is continuously unstable and there is an abnormal knocking sound. The main reasons are that the piston pin is broken, the crankshaft is broken, the connecting rod bolt is broken or loose, the valve circlip and valve locking piece fall off, the valve stem or valve spring is broken, causing the valve to fall off, etc. Once the diesel generator is found to be in such a situation when the unit is running, it must be stopped immediately for inspection to avoid causing a major mechanical accident. It can be sent to a professional maintenance point for a comprehensive inspection.

3. When the diesel generator automatically stalls, the speed will slowly decrease and the operation will be unstable. The main reasons for white smoke coming out of the exhaust pipe are water in the diesel, damage to the cylinder gasket, or damage to the automatic decompression. It is necessary to replace the cylinder gasket and adjust the pressure reducing mechanism.

4. There was no abnormality before automatic flameout, then the flameout suddenly occurred. The main reasons are that the plunger, or the injector needle is stuck, the plunger spring or compression spring is broken, the fuel injection pump control rod and its connecting pin fall off, and the fixing bolts of the fuel injection pump drive shaft and the drive plate are loose, and there is a problem on the shaft. The key is cut flat due to looseness, causing the drive shaft or drive plate to slip, making the drive shaft unable to drive the fuel injection pump.
The above four points are several common reasons for diesel generator stalling. Users need to conduct corresponding cause investigation according to different situations, eliminate unit faults as soon as possible, and promote the normal operation of the unit.