valve tappet clearance

基本解释

The tappet clearance is slightly effective to distortion only during the valve lifting period if it changes not much from designed value.
气门间隙在设计值附近变化不大时，仅在气门开启阶段对配气机构动变形稍有影响。
Valve-face wear. In addition to the conditions discussed above, excessive tappet clearance or dirt on the valve face or seat could cause Valve-face wear.
气门表面磨损：除上述介绍的情况外，气门问隙过大或气门表面与气门座的污垢均会使气门表面磨损。
Valve Breakage. Any condition that causes the valve to overheat or to be subjected to heavy pounding (as from excessive tappet clearance or from detonation ) may cause valves to Break.
气门过热或遭受重载（气门杆间隙过大或爆裂）均可造成气门破裂。