1. The low-pressure oil supply is not good. When the diesel engine goes from the fuel tank to the fuel injection pump, the oil return and return line between the oil chambers is a low-pressure oil line. When the pipe joints, gaskets and oil pipes leak oil due to damage, the air The vapour produced when entering the oil circuit leads to poor oil supply, engine start-up difficulties, acceleration delay and other failure phenomena. In severe cases, it will automatically shut down. When the tubing is reduced in area due to aging, deformation, and impurities and plugging, or when the oil filter blocks the oil filter and the diesel fuel cartridge, it will cause insufficient oil supply to reduce engine power and make startup difficult. This failure can be checked and eliminated on board. With the hand pump, pump oil to a certain pressure and loosen the gas screw. If there is an air bubble overflow and the exhaust gas is always exhausted, it means that the oil line enters the air. If there is no air bubble but the diesel oil overflows from the screw, the oil line is Blocked. The normal phenomenon is to loosen the screw slightly, and immediately the oil column is ejected with a certain pressure. The troubleshooting method is to find the damaged or aged gasket, joint or tubing to be replaced; to prevent such failure is to clean the oil filter and diesel filter, diligently check the pipeline, and solve the problem in time. 2. The oil pump piston spring breaks suddenly when the engine is running and it can not start. Loosen the deflation screw. Check that there is no fuel in the low pressure oil chamber of the fuel injection pump or very little. Pump oil from the hand pump to the entire low pressure oil chamber to fill the oil and drain the air. Start, the engine returned to normal, but after a certain distance after the automatic flameout. This failure is likely to be the oil pump piston spring break. This fault can be eliminated on the car, screw off the screw plug and replace the spring. 3. The check valve of the fuel pump is not tightly sealed. The engine works normally after the engine starts up. However, after the engine has stopped for a certain period of time, it is difficult to start. If the screw is loose, there will be glazed overflow, and the air will need to be drained to start. This type of failure is mostly caused by the tightness of the oil pump check valve seal. The inspection method is to unscrew the oil delivery screw of the oil pump. The pump oil pump fills the oil chamber of the oil outlet joint. If the oil level in the joint falls quickly, the check valve seal is not good. Remove the check valve to check the sealing surface is in good condition, whether the check valve spring is broken or deformed, whether there are particles on the sealing seat surface, according to the specific situation to take the grinding seal surface, replace the check valve or check valve spring to troubleshoot . Normally, the oil level does not drop in more than 3 minutes. The pump hand pump has an oil column that ejects forcefully from the oil outlet connector. 4. High-Pressure Fuel Pipe Plugging When a high-pressure fuel pipe of a certain cylinder is clogged due to deformation or impurities, there is a significant knocking sound in the oil pipe section after the engine is started, and the engine power drop occurs because the cylinder does not work properly. The inspection method is to loosen the oil inlet nut of the high pressure oil pipe by cylinder, and when the sound of the knocking disappears after loosening a certain cylinder, it can be determined that the cylinder is a fault cylinder, and the fault can be eliminated after replacing the oil pipe. 5. Injector Coupon stuck When the injector needle stuck in the closed position, a regular knocking sound appeared near the cylinder head. It is due to the impact of the spray pressure on the injector. The judgment method is to loosen the high-pressure fuel pipe connected to the fuel injector end. If the knocking sound disappears immediately, it can be concluded that the cylinder fuel injector needle valve is stuck.
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