The failure of the fuel injection pump of the three-phase diesel generator set can easily lead to problems in the operation of the gasoline engine. In general, when the gasoline engine is not working, it is necessary to pay attention to the maintenance and inspection, so that the wear of the plunger or the sleeve of the fuel injection pump can be found in time.
The wear of the plunger and the sleeve is mainly caused by the action of impurities in the gasoline and the brush in the high pressure gasoline. The common wear parts are the middle part of the top of the plunger and the side of the spiral and the vicinity of the inlet and outlet of the sleeve. The surface is dark after abrasion. The specific reasons for the wear of the plunger and the sleeve are as follows.
First, the used gasoline is neither filtered nor precipitated, so that the gasoline contains more impurities.
Second, the plunger coupler (the combination of the plunger and the sleeve) is not vertically mounted in the bottom of the fuel injection pump, and is also easy to wear. This is caused by the unevenness of the gasket or the excessive tightening of the plunger sleeve positioning screw.
3. The injector or the oil outlet valve is stuck in the closed position. In this way, if the fuel injection pressure of the injector is too high, the plunger continues to pump oil, causing the plunger to break (the injector plunger will be topped).
Fourth, the fuel filter does not filter. Therefore, when the dirty filter element cannot be washed, it should be replaced with a new one.
5. The gasoline grade is not correct. For example, when the temperature is high, the gasoline with too small viscosity is used, or when the temperature is low, the gasoline with excessive viscosity is used, so that the plunger and the sleeve are poorly lubricated.
After the three-phase diesel generator plunger and the sleeve are worn, the oil hole of the sleeve is not tightly closed when the oil is pressed, and some of the gasoline is pressed back from the worn groove to the oil passage (oil leakage), so that the oil is supplied. The pressure is reduced, the oil supply is reduced, the fuel supply start time is delayed, and the cut-off time is too early. Eventually, the fuel injection is poorly atomized. The gasoline engine often smokes when it is running at no load or when it is under low load. It is easy to turn off when it is idling. Even if the oil supply pressure is too low, the nozzle needle cannot be opened, it cannot be started, and it is easy. The nozzle is made to deposit carbon and glue.
Due to the wear of the plunger and the sleeve, the oil is leaked back, so that the oil supply is reduced. Especially when the gasoline engine is running at an idle speed, the oil leakage time is large due to the long oil leakage time, and the gasoline engine speed is decreased. The function of the device increases the oil volume and increases the speed. At this time, the oil leakage is reduced, the gasoline engine speed is increased, the governor reduces the oil volume, the gasoline engine speed decreases, the oil leakage increases, and the gasoline engine speed increases. Even more, the governor will increase the speed of the gasoline engine, and the repeated result will cause the gasoline engine to rotate at a high or low speed.Explosion Proof Servo Motor
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