如何铰削气门座圈（ｌ）根据铰刀上标注的角度正确选用铰刀，且刀杆和气门导管的间隙不要大于０．０５毫米（如磨损超过允许值时应更换导管）。（２）用４５”铰刀铰削气门座圈密封斜面，至消除磨损和烧蚀痕迹为止。（３）缩小密封环带宽度。先用７５“铰刀铰削气门座口，... How to Reach the Valve Seat (L) Correctly select the reamer according to the angle marked on the reamer, and the clearance between the cutter bar and the valve guide should not be more than 0.05mm (replace the conduit if the abrasion exceeds the allowable value). (2) Use 45 "reamer valve seat sealing bevel, to eliminate wear and ablation traces so far. (3) to reduce the seal ring width.