本文通过精确理论计算和现场检测资料分析，系统地研究内燃机曲轴轴承的润滑状态，提出改善曲轴轴承润滑、防止“碾瓦”的方法．分析计算结果和长期测量结果，找出能保证良好润滑的合理的轴承周隙，指出控制主轴承孔不同轴度、曲轴轮预跳动量，确保良好轴承间隙和控制所用机油的品质，是防止“碾瓦”的关键；并提出10L207E柴油机轴承间隙、主轴承孔和曲轴的检修标准及检修方法． Based on the accurate theoretical calculation and field test data analysis, this paper systematically studies the lubricating status of the crankshaft bearing of the internal combustion engine, and proposes the method to improve the lubrication of the crankshaft bearing and prevent “crushing”. Analysis and calculation results and long-term measurement results to find a reasonable bearing clearance to ensure good lubrication, pointed out that the control of the main bearing hole axis, pre-crank crankshaft momentum to ensure good bearing clearance and control the quality of the oil used to prevent “Crushing ” key; and proposed 10L207E diesel engine bearing clearance, the main bearing holes and crankshaft maintenance standards and maintenance methods.