1,Avoid only adding engine oil but not changing it.
Engine oil is essential in the use of diesel engines, mainly for lubrication, cooling, cleaning, etc. Therefore, many drivers pay attention to checking the amount of lubricating oil and adding it according to the standard, but they neglect the inspection of lubricating oil quality and the replacement of the deteriorating oil. As a result, the moving parts of some engines are always in poor lubrication. Operation in the environment, thereby accelerating the wear of various parts. Under normal circumstances, the loss of engine oil is not large, but it is easily polluted and loses the role of protecting the diesel engine. During the operation of the diesel engine, a lot of dirt (soot, carbon deposits and fouling, etc.) generated by incomplete combustion of fuel will enter the engine oil. For new or overhauled machinery, there will be more impurities after trial operation. If you just add it and not change it, you will be eager to put it into use, which will easily cause accidents such as tile burning and shaft holding. In addition, even if the engine oil is changed, some drivers will not thoroughly clean the oil passage due to lack of maintenance experience or save trouble, so that mechanical impurities still remain in the oil pan and oil passage.
2, Avoid using lubrication grease indiscriminately
(1) Grease the cylinder gasket. Lubrication grease is a commonly used grease in the repair of construction machinery, which can play a role in lubrication and sealing. Therefore, some repairers will put a layer of butter on the cylinder head gasket when installing the cylinder head gasket, thinking that this can increase the sealing performance of the diesel engine. As everyone knows, this will affect the working performance of the diesel engine. Cylinder head gasket is the most important seal between the cylinder block and cylinder head of the diesel engine. It can not only seal the high temperature and high pressure gas generated in the cylinder, but also seal the cooling water and lubricating oil in the cylinder head and cylinder block. When installing the cylinder gasket, pay special attention to its sealing quality. If grease is applied to the cylinder head gasket during installation, when the cylinder head bolts are tightened, part of the butter will be squeezed into the cylinder water passage and oil passage. When the butter between the cylinder head gasket works in the cylinder, part of it will flow due to the high temperature. The human cylinder burns, and the other part remains on the joint surface of the cylinder block and cylinder head, causing gaps between the cylinder head gasket, cylinder head and the plane of the block. High temperature and high pressure gas can easily impact the cylinder head gasket from here, destroying the cylinder head gasket and causing leakage. gas. In addition, if the butter is kept at high temperature for a long time, it will produce carbon deposits, which will cause premature aging and deterioration of the cylinder head gasket. Therefore, do not apply butter when installing the cylinder head gasket.
(2) Grease the tire nuts. In order to easily tighten the nuts and prevent corrosion, many repairers apply oil to the bolts and nuts of the tires. In fact, this is a wrong approach. After the tire nut is tightened, the thread has a self-locking feature. This is because the thread helix angle is smaller than the equivalent friction angle between threads. In a given bolt connection, the helix angle is a certain value, and the equivalent friction angle changes with the friction state between threads. Obviously, the equivalent friction angle between the threads is reduced after oiling, and the self-locking performance of the bolt connection becomes worse. Therefore, never apply grease or drip lubricating oil on the tire bolts and nuts. Doing so will loosen the nuts and even cause accidents.
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