1.由于曲轴制造质量不好,造成断裂。因此在装配发动机时,要用正规厂家的优质产品,防止质量低劣的部件装入机体内。2.修理曲轴时,应使曲轴室的主轴承同心,磨好的曲轴要处理好曲轴圆角。安装时要防止轴心线偏移和平衡配重铁安错位。安装曲轴时要用扭力扳手, 1. Due to poor quality of crankshaft manufacturing, resulting in rupture. Therefore, the assembly of the engine, the use of regular manufacturers of quality products, to prevent poor quality components into the body. 2. When repairing the crankshaft, the main bearing of the crank chamber should be concentric, and the crankshaft polished must deal with the crankshaft fillet. To prevent the installation of axis offset and balance counterweight security wrong place. Use torque wrench when installing crankshaft,