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四方机车车辆工厂从1987年开始试制8240ZJ型柴油机曲轴。到1988年底共生产曲轴26根。其中有7根曲轴磨削后在连杆颈内侧出现裂纹,有4根曲轴在主轴颈止推端面出现裂纹。曲轴出现磨削裂纹的原因
Sifang Locomotive and Rolling Stock factory trial production of 8240ZJ diesel engine crankshaft since 1987. By the end of 1988, a total of 26 crankshafts were produced. Among them, seven crankshafts cracked inside the connecting rod neck and four crankshafts cracked on the thrust end face of the main journal. Crankshaft grinding cracks appear