康明斯NT/NTA855型柴油机喷油定时偏移的调整方法有:“凸轮轴正时齿轮轴向移动法”和“偏移凸轮轴键法”。对于凸轮轴正时齿轮轴向移动法,移动量一般是根据经验公式计算,这受维修人员经验影响很大,同时有效调整量有限,因此很少使用。本文将重点阐述偏移凸轮轴键法。 Cummins NT / NTA855 diesel fuel injection timing offset adjustment methods are: “camshaft timing gear axial movement method ” and “offset camshaft key method ”. For the camshaft timing gear axial movement method, the amount of movement is generally based on empirical formula, which is greatly affected by the experience of maintenance personnel, and effective adjustment is limited, so it is rarely used. This article will focus on the offset camshaft method.