（2）曲轴主轴承减磨合金烧毁或脱落。主轴
（3）曲轴主轴承和轴颈磨损过甚，承产轴向止推装置磨损过甚，生异造成径向和轴向间隙过大。原因
（4）曲轴弯曲未得到校正，曲轴发动机装合时不得不将某些主轴承与轴颈的主轴配合间隙放大。
（5）机油压力太低、承产钻度太小或机油变质。生异原因
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