The burning of camshaft bearings in Beijing locomotives during operation was analyzed.A main reason, i.e. unreasonable loeation of positioning holes of bearing housings, was pointed out.

• 对北京型机车凸轮轴轴承运用中出现的烧损故障进行了分析，指出其烧损的一个主要原因是轴承座定位孔位置不合理。