How to Find the Cause and How to Troubleshoot after Diesel Engine Failure

How to find the cause and troubleshooting method after diesel engine failure? In the process of power production, high-power diesel engines are needed, but in daily work, diesel engines often fail due to a variety of reasons, resulting in abnormal interruption of power production. Therefore, this article briefly introduces Common failures of several high-power diesel engines, and their treatment methods.

First, excessive loss of diesel engine oil, mainly due to oil leakage, damage to the crankshaft before and after the oil seal, cracks in the oil pan, seal damage to the joint surface of the oil pan and the sealing of the timing gear chamber, will make the oil leak, Increased consumption; crankcase gas resistance, when the diesel engine is working, there will always be a part of the exhaust gas from the cylinder gap into the crankcase, in severe cases, the crankcase oil will be smashed into the combustion chamber and cylinder head cover, and even produce oil Splashing, resulting in increased oil consumption. Therefore, the use of vents should be kept open; negative pressure sheet is not deformed, sticky or wrong; ventilation pipe can not be bent; can not be replaced with a cork filled with fuel plugs.

Second, the diesel engine oil level rises. During daily maintenance, sometimes the oil level rises. There are two common causes of such failures: First, the diesel coolant leaks into the sump. For example, leaks or cracks in the cylinder head or cylinder block, damage to the cylinder gasket hole, or damage to the rubber seal of the cylinder liner will cause cooling system water to leak into the oil pan; second, fuel leakage. Leakage of the fuel pump, failure of the piston ring, cracks in the piston or cylinder liner, and serious wear of the plunger of the fuel injection pump will cause fuel-based diesel to leak into the oil pan.

Third, the diesel engine oil pressure is low, the lack of oil pump oil pressure caused by low pressure. When the oil pump is worn for a long period of time, the radial and end clearances of the gear or rotor increase, and the amount of oil pumped out will decrease, resulting in a drop in oil pressure. When the oil pump is installed, it should be filled with oil to avoid air in the pump and not suck oil. In addition, the connection between the oil pump and the suction pan must be sealed. Otherwise, the oil pump output will be reduced, resulting in low oil pressure.

Fourth, diesel engine oil pressure is high, the main reason is that the oil number is wrong. If the lubricant used in the summer is used in winter, this not only makes the diesel engine difficult to start, but also affects the normal operation of the lubrication system. Therefore, a reasonable selection must be made according to different seasons; the spring pressure of the pressure limiting valve and the return valve is adjusted too large to open the engine. The pressure is too high. This will not only increase the consumption of lubricating oil, may also rise through the tubing, should adjust the pressure of the valve according to technical requirements.

Fifth, the oil temperature is too high, the main reason is that the cooling system is faulty, such as cylinder, cylinder head water jacket too much scale, too thick, poor heat, the engine temperature increases, causing the oil heat load increases, so that the oil temperature Too high. At this point, scale should be completely removed and soft water should be used. If the oil radiator does not work properly, the oil temperature will increase; the lubrication system will not be clean. If the oil coarse filter is clogged and the resistance increases, some or all of the oil cannot pass through the strainer and the radiator and enter the main oil directly from the safety valve. Road, causing the oil temperature to be too high. This is generally due to maintenance or maintenance is not serious, not timely, or the use of a poor quality oil does not meet the requirements, the wrong grade of motor oil, dirty oil and other reasons. Therefore, the diesel engine requires that after every 250 hours of operation, the oil filter should be replaced with a series harmonic WWW.HB1000KV.COM.

Because the working environment of the diesel engine is generally quite bad, the loss of the engine oil in the diesel engine is very fast. In actual work, the status of the engine oil in the diesel engine should be paid attention to at the same time, and the diesel engine cleaning work should be done to ensure the normal operation of the diesel engine.