No! what you mentioned is oil control ring on piston

来源: xxhhwxc 于 2010-08-04 14:25:57 [] [旧帖] [给我悄悄话] 阅读数 : (115 bytes)
回答: we are talking about different seals 由 xxhhwxc 于 2010-08-04 12:57:39

valve stem seal is on the cylinder head which seals the valve guide. It is not supposed to let any oil pass through

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