No! what you mentioned is oil control ring on piston

來源: xxhhwxc 於 2010-08-04 14:25:57 [] [舊帖] [給我悄悄話] 閱讀數 : (115 bytes)
回答: we are talking about different seals 由 xxhhwxc 於 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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