Diesel engine oil deterioration is a common failure in daily life, but if not found in time, it will affect the use of diesel engine, which can not work normally. Therefore, according to years of experience in diesel engine maintenance, malice summed up "5 reasons for diesel engine oil deterioration":
Diesel engine oil metamorphism analysis:
In normal use, the oil in the diesel oil pan will be gradually oxidized because the oil is exposed to the air in contact with the air. As the acid, the colloid, the iron and the asphaltenes in the oil gradually increase, the color of the oil gradually becomes dark and the viscosity decreases gradually. Thus, a new oil should be changed to the scheduled oil exchange period. There is no unified regulation for the period of oil exchange in all countries. So what kind of lubricating oil is used, when and how to replace it should comply with the regulations of the factory. For the diesel engine of engineering machinery, it has been proved that it is good to replace a new oil when the oil is used more than 400H.
If the oil is sometimes changed soon, the oil is rapidly deteriorated, the color changes from deep blue to yellow, or first black and then abruptly gray. This is because the oil in the oil seep into the.7 oil bottom, and the oil seeped into the water, and the oil and water are yellow or gray due to the vibration of the diesel engine, the stirring of the motor parts and the heating and so on, and the oil is greatly reduced. Lubrication capacity.
The oil has water, which can promote the formation of the oil sludge and accelerate the deterioration of the oil. At the same time, it will also weaken the antioxidant and dispersing properties of the additives, promote the formation of the foam, cause the emulsification and destroy the oil film. Practice has proved that when the water reaches 1%, the wear rate of the machine parts is increased by 2.5 times.
Analysis of 5 reasons for oil deterioration of diesel engine:
1 diesel oil is mixed with water, and the improper use of the engine oil number will also lead to the early deterioration of the oil used by the diesel engine. Therefore, high grade oil can only be used instead of low grade oil in the selection of diesel engine.
The 2 crankcase is ventilated by the difference between the piston and the cylinder of the engine oil, the piston ring between the piston and the cylinder is sealed, but when the diesel engine works, it is inevitable that some combustion gases will go into the crankcase. If the piston ring is seriously worn, the phenomenon is more serious. Thus, the pressure of the gas in the crankcase will increase, if the pressure inside the crankcase is pressed. The force is higher than the external atmospheric pressure, that is, it will have certain resistance to the piston operation, and the oil will leak out from the oil pan and the cylinder body. In addition, the oil can deteriorate because of the leakage of gas in the crankcase gas. To prevent the above situation, only the gas pressure in the crankcase and the external atmospheric pressure are made. The pressure inside and outside the crankcase is equal.
The survey found that some staff were not aware of the importance of crankcase ventilation.
Take the 4135 diesel engine as an example. After losing the cover of the oil adding, it is blocked by cotton yarn or broken cloth, or because of the fear of the crankcase to enter the ash, the oil filling mouth is wrapped in plastic. The result inevitably leads to the inability to expel the crankcase from the air cylinder, piston and piston ring, in order to cause the oil to deteriorate in the short term.
3 engine oil filter seal gasket is taken as an example of 4125 diesel engine. The function of the seal washer of the oil coarse filter is to prevent the oil from filtering without filtering, and directly into the main oil channel. Its position should be between the inner and outer filter core, the outer filter core outside the hole and the inner hole of the inner filter core. If this circle leaks, it will cause the oil to change dirty quickly. Deterioration.
4 improper maintenance in the process of cleaning the crankcase, if the oil filter or oil cooler is not thoroughly cleaned, the diesel engine will become dirty and black after adding the new oil for only a few hours. In addition, if the filter cartridge is blocked or damaged and does not be cleaned or replaced in time, it will also be filtered. The oil deteriorated by weakening the capacity.
It has been proved that a bottle of WWT oil is used to clean and maintain the diesel engine before the oil change, and the diesel engine is thoroughly cleaned and maintained. Then a bottle of wentin oil is added to the new oil to strengthen the additive, and the good effect will be achieved.
5 using the method error in the operation of the diesel engine, if the temperature is too high or often overloading and so on, it will cause the oil to be oxidized by high oil temperature. In addition, the engine oil and work can easily lead to more and more dust from the air.
