The most common "hole" in a cylinder occurs where the top of the cylinder (holding the valves and spark plug and also known as the cylinderhead) attaches to the cylinder itself.
气缸上的孔最可能出现在气缸顶部（装阀门和火花塞的部位也即气缸盖）。
2
The spark plug must form a good seal inside the cylinderhead to avoid leakage of without the high-tension current shorting-out.
火花塞必须在汽缸盖内形成良好密封以防止燃烧过程气体高压泄露，并且能够继续工作而且高压电路没有短路。
3
A method and device are provided for loosening a sticking connection, in particular a glow plug in the cylinderhead of an engine.