The calculation procedure and method of the piston leans towards the jar to the influence of life-span of the engine, taken farm transporter 375engine as an example, has been carefully introduced and quantitatively analyzed in this paper.

• 摘要以农用车375柴油机为例、详细介绍和定量分析了活塞偏缸对柴油机寿命影响的计算步骤和方法。