6月初,我们接到一起修理质量(品质)投诉,一位个体车主在一家二类维修企业(简称“维修厂”)修理一辆东风柴油自卸车发动机。该车出厂使用不到1个月,换上的新曲轴在运行中折断。经我们查看,曲轴从第4道主轴颈后端成斜面断成两截,第4道主轴瓦合金层明显烧蚀,其余各道主轴瓦及连杆轴瓦也有不同程度的拉伤痕迹。再回头去维修厂查看原始维修资料,只有在厂方自签的维修合同中写有“维修项目”为“发动机大修”。 In early June, we received a complaint about the repair of the quality (quality). An individual owner repaired a Dongfeng diesel dump truck engine at a Type II repair company (“Maintenance Plant”). The car used less than a month factory, put on a new crankshaft broken in operation. After our examination, the crankshaft was cut into two sections from the bevel of the rear end of the fourth main journal, the ablated alloy layer of the fourth main bearing bush was obviously ablated, and the rest of the main and connecting rod bearing bushings also had various degrees of strain marks. Then go back to the repair shop to view the original maintenance information, only the factory self-signed maintenance contract wrote “maintenance items” as “engine overhaul.”