After the fuel injection pump in the diesel engine is connected with the oil circuit, a sealed circuit is formed. When there is air in the original body, the diesel engine should stop supplying oil. At this time, the operator should first check the stock of diesel oil in the fuel tank, whether it is out of use, and whether the inlet and outlet hoses leave the oil level; second, check whether the gas outlet of the fuel tank is blocked, resulting in a negative pressure in the oil circuit and failure to supply oil. Loosen the bleeder screw in the fuel injection pump. Use hand pump to pump oil. If there are a lot of bubbles or froth, and feel that the oil supply is not fast, it means the low pressure oil line is also blocked. At this time, you should check the coarse and fine diesel oil filter. Whether the cleaner is blocked or if the tubing has cracks or bumps; whether the gaskets at the tubing connections are forgotten or if the gaskets have been damaged, resulting in leakage or air intake. When the hand oil pump is pumping oil, it feels that the oil supply is smooth, but there is no pressure. This is mainly due to the break or fatigue deformation of the spring in the oil spill relief valve on the fuel injection pump. The steel ball wears or there is dirt filling and the seal is not strict. Causes the fuel pump to run out of oil due to low pressure in the low pressure line. When checking the sealing effect of the oil spill relief valve, use hand to block the oil inlet and blow it with the mouth. The blow is not normal. Otherwise, the seal is not strict. When the oil pump is used to pump the oil, it should feel elastic when pulling the handle. It is easy to release the handle or release it automatically. For the old-fashioned hand pump, check whether the oil path between the fuel injection pipe and the fuel tank is blocked. If the blockage occurs, it is mostly due to the oil filter screen under the pump being blocked by dirt or the gasket being damaged. The oil pump is used to pump the oil. There is no suction when the handle is moved. When the handle is pressed, the resistance is very large, mainly because the oil pump is blocked by the oil pump. Most of the reasons are due to the fact that the oil injection screw of the fuel injection pump and the overflow valve are installed in reverse, the oil return valve in the oil pump is installed with excessive wear or wear, and the rubber seal of the hand oil pump is damaged due to aging. If there are a large number of bubbles in the oil return pipe on the injector, this is mainly due to the fact that the fuel injection nozzle of a certain cylinder is stuck in the open position and the high pressure gas in the cylinder is pumped into the fuel injection pump body. Remove the end of the oil return pipe connected to the oil filter, block the filter oil return port, and the air bubble disappears, indicating that the fault is in the injector, and then find out which cylinder fuel injector is stuck and remove it.
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