活塞顶坏了。
If necessary extend the probe of the dial gauge until you can definitely take measurements on the piston crown.
如有必要，延长百分表的探针，直到可以明确测量活塞顶为止。
This paper studies the fracture mechanics of piston crown crack by means of finite element method and photoelastic method.
本文应用有限元法和光弹性试验对活塞顶的裂纹进行断裂力学分析。
Also the valve heads will be liable to be burnt by the passing hot gases, and there is the likelihood of the piston crown touching an open valve, which can seriously damage the engine.
而且气门头部容易被经过的高温气体烧蚀，活塞顶部也可能会碰到气门使发动机严重损坏。
Also the valve heads will be liable to be burnt by the passing hot gases, and there is the likelihood of the piston crown touching an open valve, which can seriously damage the engine.
而且气门头部容易被经过的高温气体烧蚀，活塞顶部也可能会碰到气门使发动机严重损坏。
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