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针对东风4型机车柴油机原油气分离装置效果不良、通气管外壁流油、车顶出口处大面积油污等具体情况，分析了造成这些情况的原因，提出了改造方案，介绍了改造后的效果。
In view of the poor performance of Dongfeng 4 locomotive diesel engine separation unit, the flow of oil on the outer wall of the ventilation pipe and the large area of oil at the exit of the roof, the reasons for these problems were analyzed. The transformation scheme was put forward and the effect of the transformation was introduced.