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曲轴是发动机的重要组件，当发动机工作不正常、飞轮或减振器失效时，曲轴受不平衡动载荷的冲击而受损。有时冷起动、进气不清洁、机油变质或润滑不良，均可使曲轴表面产生干摩擦或半干摩擦，使曲轴轴项失圆、拉伤或烧伤，严重时导致rrrrrrrrn烧轴抱瓦。烧瓦后的曲轴必须修复才能重新装配发动机。1检测(1)仔细检套曲轴表面是否有裂纹(裂纹多产生在轴项的根部或油道处，宜采用荧光磁粉探伤或其他方法进行检测)，检测无裂纹或损伤后，一定要做消磁处理。(2)检测烧伤部位和曲轴前后端安装油封部位的尺寸;检测曲轴的直线度、连杆轴颈的扭曲度，确定修复方案。
Crankshaft is an important component of the engine, when the engine is not working properly, flywheel or shock absorber fails, the crankshaft by the impact of unbalanced dynamic load damage. Sometimes cold start, the intake is not clean, oil deterioration or poor lubrication, can make the crankshaft surface dry friction or semi-dry friction, the crankshaft axis out of shape, strain or burn, leading to serious r r r r r r r r n Burning shaft burning tile. The burned crankshaft must be repaired to reassemble the engine. 1 test (1) carefully inspecting the surface of the crankshaft for cracks (cracks occur in the root of the item or the oil at the Department should adopt fluorescent magnetic particle inspection or other methods of detection), no crack or damage detection, be sure to do degaussing deal with. (2) to detect the size of the burn site and the front and rear ends of the crankshaft oil seal installation; test crankshaft straightness, connecting rod twist, determine the repair program.