The cause and elimination method of Volvo generator unit's unstable operation after starting

In the process of using the generator set, there may be a lot of problems, such as the unstable operation of the generator set after starting, so what is the reason for this? What are the exclusions?

1, the governor can not reach the lower speed.

Elimination method: The high pressure tubing of the upper four cylinders of the high pressure oil pump was cut off one by one. The results showed that the blue smoke disappeared after the third cylinder was disconnected. After the shutdown, the third cylinder injector was removed, and the injection pressure test was carried out on the injector. The results showed that the third cylinder nozzle couple was dripping oil and the amount was very small.

2. Each cylinder of the generator set works poorly, resulting in different compression pressures of each cylinder.

Elimination method: Check the oil scale in the oil pan of the diesel engine to observe whether the oil viscosity is too low or too much oil, so that the oil into the combustion chamber and evaporated into oil and gas not burned and discharged from the exhaust pipe. However, it was found that the quality and quantity of the oil were in line with the diesel oil regulations.

3. The elasticity of the internal speed regulating spring of the governor is weakened, so that the speed regulating performance changes.

Troubleshooting method: After starting the generator set, increase the speed to about 1000r/min, observe whether the speed is stable, but hear the sound of the generator set rotating is still unstable, and the fault has not been eliminated.

4, the fuel supply system has air, water or oil supply is not smooth.

Elimination method: Loosen the air release screw of the high pressure oil pump, press the hand oil pump, and remove the air in the oil circuit.

5. The oil supply of each pump plunger in the high-pressure oil pump is more related.

Elimination method: tighten the oil return screws of high and low pressure oil pipes of diesel engine.

6, the speed of the governor can not reach the calibration speed.

Elimination method: Remove the high pressure oil pump assembly and carry out technical inspection on the inside of the governor. It is found that the adjusting tooth rod is not flexible. After repair, adjustment and assembly, start the diesel engine to about 700r/min, and observe whether the diesel engine works smoothly. If no exception is found during the check, the fault is removed.

7. The inner rotating parts of the governor are not balanced or the clearance is too large.

Elimination method: Draw a fine copper wire close to the diameter of the spray hole from a thin wire, and dredge the oil injection hole. After the test, it is found that the nozzle even spray is normal, and then the injector is assembled to start the diesel engine. It is found that the blue smoke disappears, but the diesel engine speed is still unstable.

Jiangsu Meao Power Technology Co., Ltd. is an important manufacturer of diesel generators. The company mainly manufactures and sells diesel generator sets with power of 3-3000kW, mobile power station of 24-600kW, Marine emergency diesel generator set of 24-800kW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, static speaker, mobile lighthouse, container, etc.) diesel generator At the same time, we are engaged in generator set maintenance and after-sale service of generator set accessories.