（2）曲轴连杆轴承减磨合金烧毁或脱落。连杆
（3）曲轴连杆轴承或轴颈磨损过甚，轴承造成径向间隙太大。产生
（4）曲轴内通奋形由颈的异响因油道堵塞。
（5）机油压力太大、曲轴砧度太小或机油变质。连杆轴承
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