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Grease foramen
连杆小端及衬套上的
润滑油孔
:此小孔的功用是,使润滑油及时地输送到连杆小端及其衬套上起润滑作用,此孔若产生堵塞现象,将加速衬套的磨损甚至使连杆产生疲劳裂纹,降低其使用寿命,使发动机过早地产生敲击声,还会对连杆轴及瓦片产生冲击。