一东方红-75型拖拉机在推土作业中突然发生捣缸事故,造成近万元损失。拆机检查发现,二缸的一根连杆螺栓止转卡口没有卡在连杆的止转销内。这样,拧紧螺栓时,虽然满足了紧度要求(190～210牛顿),但由于螺栓大头和止转销发卡,实际上只是将止转销压缩了一截,而螺栓上端并未与连杆座贴紧。在发动机的工作过程中,由于螺栓上部的受力面积较小,在 An East-red-75 tractor in the bulldozer suddenly hit the tanker accident, resulting in nearly 10,000 yuan loss. Disassemble inspection found that a two-cylinder connecting rod bolt stop card is not stuck in the connecting rod stop pin. Thus, tighten the bolt, although the tightness requirements (190 ~ 210 Newton), but because of the bulk of the bolt and stoppin card, in fact only the stop pin is compressed for a while, and the upper end of the bolt does not link with the seat Tight. In the engine’s work process, due to the smaller force on the upper part of the bolt, at