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1问题的提出以东风型机车为主型机车承担客货及调小运输任务的麻尾机务段，近两年10E207J型柴油机球铁活塞顶部（大多为燃烧室燃油油束喷射处）穿孔已成为严重影响机车质量的惯性故障。从今年上半年因活塞质量问题发生的机破、临修所占柴油机故障的比例（附表）上足以看出问题
PROBLEM TO BE SOLVED BY THE INVENTION The perforation of 10E207J diesel-powered ductile piston crown (mostly the fuel jet of the combustion chamber) has become serious in the past two years with the main engine locomotive of Dongfeng locomotive undertaking the task of transporting tail and cargo of small passenger and cargo. Affect the quality of the locomotive inertia failure. From the first half of this year due to piston quality problems occurred in the broken, repair repair accounted for the proportion of diesel engine failure (schedule) enough to see the problem