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例 1 一辆DD 6112型黄海客车(发动机为6120型柴油机),累计行程约5万km,行驶中突然出现金属撞击声,响声在空气压缩机与喷油泵处较为明显。检查分析根据响声传出的部位,首先检查喷油泵的供油提前角自动调节器,调节器零部件磨损正常。再打开空气压缩机,检查它的连杆轴承和气门等,均未发现异常现象。根据6120发动机的结构分析,空气压缩机是通过正时室内的传动齿轮带动的。打开正
Example 1 A DD 6112 Yellow Sea passenger car (engine type 6120 diesel engine) has a total journey of about 50,000 km. During the journey, a sudden metal impact sound is heard, which is evident at air compressors and fuel injection pumps. Inspection and analysis According to the sound of the outgoing parts, first check the fuel injection pump fuel advance angle automatic regulator, regulator parts wear normal. Then open the air compressor, check its connecting rod bearings and valves, etc., were not found abnormalities. According to the structural analysis of the 6120 engine, the air compressor is driven by the transmission gear in the timing chamber. Open positive