The cam-bores may present a roundness error within the diameter tolerance, so the most significant diameter value for the shim/tappet thickness determination is the one along the valve train axis.

• 凸轮孔可能会出现直径公差范围内的误差，所以决定垫片/凸子厚度的最大直径值应位于气阀机构的轴部。