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Many high-power internal combustion engines are used in the oil industry. Such as improper use of internal combustion engine, running for a period of time after the liner, the cylinder often appear pitting phenomenon, resulting cylinder liner, cylinder perforation, coolant overflow into the oil pan, resulting in oil emulsification, internal combustion engine lubrication damage. The causes of cavitation in internal combustion engines mainly include the following two points: First, improper use of cooling water for the preparation of cooling liquid does not conform to the standard of cooling water for internal combustion engines. Second, the preparation of the coolant is not correct, no preservatives. Engine work, the cooling fluid circulating in the machine, the body cooling, the temperature gradually increased. If the coolant does not meet the specified requirements, it is easy to produce scale. Scale is a corrosive substances, the cylinder liner, cylinder corrosion. As the coolant circulating in the internal combustion engine cylinder liner, cylinder impact, exacerbating the corrosion, resulting in cavitation. To prevent cavitation caused by the internal combustion engine, the first choice of cooling water used to prepare the coolant should be appropriate, the ion content to meet the requirements; the second is the coolant preparation to be correct. Internal combustion engine cooling water to be clean, and second, the use of soft water. The standard is: chloride ion content of less than 150mg / L; calcium and magnesium ion content of 0.7 ~ 5.3mg equivalent / L; pH value between 6 ~ 8.5 (about alkaline). Preparation of internal combustion engine coolant must be added preservatives, the concentration can be added according to instructions for the implementation of preservatives. Internal combustion engine in winter (below 5 ℃), the coolant must also add antifreeze.