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 cylinder head) 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）。
The spark plug must form a good seal inside the cylinder head 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。
A method and device are provided for loosening a sticking connection, in particular a glow plug in the cylinder head of an engine.
一种用于松开粘结连接、特别是发动机气缸盖上电热塞的方法和装置。
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