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Incorrect use and operation
1. The use of oils with unsuitable brand grades Some pilots lack the basic knowledge of oil, and do not understand the brand level of oil. They add wrong oil and cause poor lubrication.
2. Unclean air enters the cylinder. The wind and sand in Xinjiang is relatively large and the air filter is easily dirty and blocked. When the air intake is insufficient to cause black smoke and insufficient power, some pilots do not clean the air filter. Instead, air filter elements and air alarms are removed to allow air to enter the cylinders without filtering. This not only results in abrasive wear on the cylinder liners, but also contaminates the oil and speeds the wear of other parts.
3. The temperature difference between winter and cold winters in southern and northern China is relatively large. The vehicles that often run in southern Xinjiang often do not replace winter oil on time in winter, and do not warm up when starting the engine in cold northern China. At this time, the engine cylinder liner and the piston It is easy to pull cylinders and stick cylinders, causing early wear of cylinder liners. In addition, the use of starter fluid to start the engine in winter is one of the reasons for the early wear of cylinder liners.
The poor quality of parts caused by parts quality problems caused early wear and tear of parts and even scrapped. For cylinder liners, the content of trace elements in the raw materials does not meet the requirements and the inner wall surface is not well handled, resulting in defective cylinder quality and one of the causes of early wear of the cylinder liner. A number of piston rings have been found in use. Because the springs in the combination oil ring are too long, the oil ring is too clean when the piston descends, causing early wear of the cylinder liner.
Poor repair quality Focusing on the quality of repairs has a great influence on the service life of components. Frequent halving and harsh working environment make the dirt particles suck into the cylinder, which can easily cause abrasive wear on the cylinder or the cylinder wall. In addition, the inspection of the connecting rod's bending and twisting and the wear of the crankshaft thrust washer is not paid attention to in the repair work, which often results in the imitation of the cylinder liner.
Lubricating parts function decline or failure
The cylinder sleeve of X6130 diesel engine is lubricated by the crankshaft connecting rod's splash oil and the oil jet nozzle's pressure jet oil. If the oil pump's pump oil capacity is weakened, the lubrication pipeline leaks or the oil is too dirty to block the oil nozzle, the cylinder sleeve often lacks lubrication. And the cooling effect of the piston is deteriorated and the cylinder liner is worn earlier. In addition, the oil nozzle assembly is installed on the auxiliary oil passage, and the oil must be opened before entering the auxiliary oil passage. When the auxiliary oil passage pressure limiting valve fails, the main and auxiliary oil passage pressures are reduced, causing Lubrication parts are poorly lubricated and the cylinder is worn early.
Analysis of Causes of Early Wear of Cylinder Liner of X6130 Diesel Engine
The X6130 diesel engine is one of the power and power models used by our country's own design and manufacture of vehicles, and has nearly 1,000 units in the Xinjiang region. The supporting host for some models of cars such as Hongyan and Huanghe is the X6130 diesel engine. After a period of use, it was found that the early wear of the cylinder liner was severe, resulting in diesel engine oil, smoke, and insufficient power, which caused inconvenience to the production. After investigation and analysis, it is believed that the reasons for the early wear of the cylinder liner in the use of the diesel engine in the Xinjiang region are mainly the following aspects.