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Causes and solutions of air in the fuel injection pump of di

Article provenance：Hai Rui ZhonglianPopularity：Publication time：2020-03-25 08:50

Causes of air in the fuel injection pump of diesel engine fire pump and Solutions

When the fuel injection pump in the diesel engine fire pump is connected to the oil circuit, a sealing circuit is formed. When there is air in the original air, the engine of the diesel engine fire pump shall stop working and shall not use oil. At this time, the operator shall first check whether there is diesel oil inventory in the tank of diesel engine fire pump and whether the throat oil pipe leaves the oil level;

Then check whether the fuel outlet of the fuel tank of the diesel engine fire pump is blocked, resulting in the formation of vacuum negative pressure in the oil circuit and unable to supply oil. Then loosen the exhaust screw in the fuel injection pump and pump oil. If there are a lot of bubbles or oil bubbles, and the oil supply is not smooth, it means that the low-pressure oil circuit is blocked. At this time, check the coarse and fine filter and diesel filter. Whether the cleaner is blocked, whether the pipe is cracked or impacted; forget to install the gasket at each pipe joint, or the gasket is damaged, resulting in leakage or air intake.

When pumping by hand pump, the oil supply is very stable, but there is no pressure. This is mainly due to the fracture or fatigue deformation of the oil return safety valve spring of the injection pump, the wear or ash accumulation of the steel ball, and the lax sealing, resulting in the low pressure of the low-pressure oil pipe, resulting in the insufficient oil supply of the injection pump. When checking the sealing effect of the oil return safety valve, block the oil inlet by hand and blow it with the nozzle normally, otherwise the sealing is not tight. When pumping with hand pump, the handle should feel elastic. When applying pressure, the handle is easy to release automatically.

The old hand pump should also check whether the fuel passage between the water injection pump and the oil tank is blocked. If there is any blockage, it is mainly because the intake filter under the fuel pump is blocked by dirt or damaged by the gasket. When pumping oil with hand pump, the shaft handle can not touch the suction force. When pressing the handle, there will be great resistance, mainly because the oil path between the oil pump diesel engine water pump and diesel engine fire pump and mobile pump truck is blocked.

If there are a lot of bubbles in the return pipe of the fuel injector of the diesel engine fire pump, it is mainly because the cylinder nozzle coupling is stuck in the open position and the high-pressure gas in the cylinder bounces into the fuel injection pump body. Remove one end of the oil return pipe connecting the oil filter, block the oil return port of the filter, the air bubble disappears, indicating that the fault is in the injector, then find out which cylinder of the fuel injection nozzle is stuck and take it out.