Applicable scope: Dong Kang 6L-375 related accessories: connecting rod, piston pin, piston pin circlip principle: between the crankshaft and connecting rod wear location: hole fault and analysis of connecting rod bearing: burnt axle analysis: (1) the poor manufacturing quality of crankshaft (2) bearing manufacturing quality difference. (3) the bearing cover deformation, bearing the back gap, and the bearing alloy cannot completely close fitting and loose (4) bearing installation is not correct, improper gap (5) torque fastening bolt is too small or the failure of bearing bolt anti loose loose (6) oil pump low pressure (7) oil is impurity of the plug and the axle bush caused by dry friction.