当然normal

Valve seal不是全封，而是控制漏油率。正常工作时总有一些机油通过该seal流入气缸来润滑cylinder ring。现在的状况可能也就是流速快了一些。

所有跟帖： 

• we are talking about different seals -xxhhwxc- ♂ (180 bytes) () 08/04/2010 postreply 12:57:39

• we are talking the same seal. Valve seal also called valve stem -biglow- ♂ (127 bytes) () 08/04/2010 postreply 14:03:03

• No! what you mentioned is oil control ring on piston -xxhhwxc- ♂ (115 bytes) () 08/04/2010 postreply 14:25:57