机械外文翻译--发动机拉缸问题探讨(编辑修改稿)

机械外文翻译--发动机拉缸问题探讨(编辑修改稿)内容摘要：

ine the oil film between the piston and cylinder liner, resulting in cylinder scoring. engine temperature is too high As the engine temperature is too high, so that excessive expansion of the piston to eliminate with the gap, resulting in cylinder scoring. Causing the engine temperature is too high main reasons are: (1) cooling system leaks, water shortages Cylinder Head Gasket water crossings washed out or highlight the amount of wet cylinder liner does not meet the requirements, as well as wetaging or damaged cylinder seal ring will result in leakage of cooling water. Radiator has been corrosion or damage, aging of the pipe break something, plumbing joints loose, water pump seal damage and so on, would give rise to the cooling water that leaked. In addition, the cylinder head casting itself is defective or improper use can also cause cracks leaking, causing the engine temperature is too high. (2) the use of long overload Overload the engine a long time to use, the engine will generate a lot of heat, cooling system can not disperse the excess heat, so that the engine can not maintain the normal operating temperature, so that the engine produces heat. (3) The thermostat failed, no big loop The role of thermostat is to control the water temperature in a certain range, in the water temperature is low, the thermostat off, water from the thermostat directly through the bypass pipe flow back into the cooling water pump, not through the radiator, which is the cooling watercycle process. When the water temperature rose to a certain extent, the thermostat automatically open, the water circulating through the radiator, which is a large cycle of cooling water, if the thermostat fails, no big loop cooling water, the engine work of excess calories as heat can not be devices distributed out, the engine temperature is too high. (4) cooling water pump is damaged Forced cooling water in the engine water jacket and circulating between the radiator depends on the cooling water pump, cooling water pump is damaged, the cooling water is not circulating, the engine output also can not produce heat emitted to the atmosphere through the water cycle going, which led to the engine temperature too high. (5) watercourse or by blocking the ventilation radiator Watercourse blocked will inevitably lead to reduced water circulation, which affects the heat dissipation. Cooler air by blocking, affecting the effective thermal radiator area, effective heat dissipation area of reduced ability to decrease heat dissipation, which would make the engine caused by excess heat is not distributed the engine temperature is too high. (6) injector fuel injection advance angle is too small or too large Fuel injection advance angle is too small, so that bustion pushed back, resulting in increased plement bustion, fuel injection bustion heat generated by excessive increase in both cases will cause the engine temperature is too high. 3 oil shortage Do not check the oil quantity required, or in the work process due to loosening caused by oil leakage of oil pipes, can cause interruption of lubricating oil film, the surface loss of oil piston and cylinder, causing serious wear and tear, occurred pull cylinder, connecting rod bearings and other serious incidents burning , especially in the work process due to oil leakage, failure to make timely discovery, will have serious consequences. Caused by the surface of the piston and the cylinder fuel supply shortage of oil because there are several main areas:。