摘要：近两年来,新乡机务段DF4B型机车柴油机排气总管有不同程度的发红现象,直接导致柴油机经济性下降,而且排气温度过高,容易引起火灾,给机车运用带来不安全因素.由于该类故障原因复杂,不能准确判断和处理,造成机务段人力、物力的浪费,增加了检修成本,严重影响了机车的正常使用.
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