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　The diesel engine on heavy trucks has high working strength and pressure, so all components inside the engine must have high strength and stiffness. Among them, the cylinder liner is an important and easily damaged part in the engine, and the inner chamber bears high pressure, high temperature and high-speed friction of the piston. In case of improper maintenance or use, it is likely to cause some faults.

In particular, the cylinder liner of the North Benz V3 accessory engine works in a complex and changeable environment for a long time, which easily leads to wear, deformation and corrosion of the cylinder liner, thus affecting the power, economy and service life of the engine. Main causes of cylinder liner wear and corrosion

Our common engine cylinder liners are mainly divided into wet type and dry type. The main difference is whether they contact with coolant. Among them, dry cylinder liners are often used in gasoline engines or some diesel engines with smaller horsepower. At present, wet cylinder liner is a common type in trucks. The outer surface of the outer diameter of the cylinder liner is in contact with the engine coolant, which is conducive to the heat transfer between the cylinder liner and the coolant, and plays a good role in heat dissipation and cooling.

The intake air filtration is not clean: the engine of the North Benz V3 accessory needs to inhale a large amount of air during operation, and the air contains sediment, dust and other impurities. At this time, an air filter is needed to ensure the air quality entering the cylinder and filter impurities to reduce the wear of cylinder liner, piston, piston ring and other parts.

If the air filter cannot be cleaned and maintained for a long time, or if the air filter of inferior quality is purchased, the filtering effect will deteriorate and the wear of the cylinder liner will be accelerated. Under normal circumstances, the air inhaled by the cylinder is too dirty, and the worn part is mainly concentrated in the upper and middle part of the cylinder liner.

Failure to change the oil according to the specified interval: if the oil is not changed regularly, the impurities contained in the oil or worn debris may splash onto the cylinder wall, causing abrasive wear, causing abnormal wear of the cylinder wall and even cylinder pulling. Generally speaking, this lubricating oil contains a large number of hard particles, and most of the wear is mainly concentrated in the middle and lower part of the cylinder liner.

In addition, the winter temperatures in the north and south of China vary greatly. Some long-distance trucks often do not change the oil on time in winter, and do not preheat when starting in the northern cold regions. At this time, cylinder pulling and sticking are easy to occur between the engine cylinder liner and the piston, resulting in early wear of the cylinder liner.

Poor lubrication conditions: when the engine is running, the upper part of the cylinder liner is close to the combustion chamber, the overall temperature is high, and the lubrication conditions are relatively poor. In addition, the diesel engine is overloaded and it is difficult to form a good oil film, resulting in the inability to obtain a stable lubrication effect between the cylinder liner and the piston ring, resulting in partial dry friction or semi-dry friction, resulting in wear of the upper part of the cylinder.

Chronic corrosion: We all know that the sulfur content in fuel is very high, especially for Kayou, who uses small oil all year round, the sulfur content exceeds the normal standard, and it is easy to produce strong acidic substances after combustion, which will cause and aggravate the corrosion and wear of engine metal parts.

In short, when the combustible mixture in the cylinder burns, water vapor and acid oxide will combine to form acid vapor. Under the action of cooling water, acid is easy to form on the cylinder liner, which leads to corrosion and wear of the cylinder liner. In addition, the use of inferior coolant or not replacing the coolant for a long time is also an important reason for cylinder liner corrosion. This wear is characterized by the formation of a locally loose hole in the cylinder liner.

The cylinder sleeve cavity is etched due to the use of inferior coolant

This kind of engine failure caused by long-term non-replacement of antifreeze or use of inferior antifreeze is still very common. In order to save money, many card users even use water instead of inferior coolant in summer. However, they do not know that the tap water contains many minerals. After heating and evaporation, the scale will adhere to the metal surface, which will affect the heat dissipation performance of the cooling system.

Many card users may think that antifreeze only plays a cooling role. In fact, the formulation of anti-scaling, anti-corrosion and anti-foam is added to the antifreeze, which can not only effectively reduce the generation of bubbles, protect the normal use of cylinder liners, but also protect cylinder liners and rubber sealing rings, and extend the overall service life. These are functions that water and inferior coolant do not have. However, it should be noted that the antifreeze has a service life no matter how good it is, and it needs to be replaced in time after expiration.

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