給xxhhwxc，關於valve seal

樓下帖子都快刷屏了，我另開新貼。我說的就是 valve seal (or valve stem seal)，不是piston ring seal。valve seal 就是一調節seal，而不是起完全密封作用。engine工作時需要少量油來潤滑valve stem(我原帖寫的是piston ring，記錯了，引起誤會）。如果該seal老化，過多的oil 下流而導致氣缸燒機油，從而產生藍或黑煙。對樓下車主來說，隻要燒機油有限，而且engine performance沒什麽變化，問題可以放一放。
我順便把我學車是的教材上的關於valve seal 的講述發在這兒以供參考。注意下圖中的紅線部分。

所有跟帖： 

• you are right -xxhhwxc- ♂ (170 bytes) () 08/04/2010 postreply 16:08:34

• have you changed the seals? -隱睾- ♂ (0 bytes) () 08/05/2010 postreply 09:52:22

• yes -xxhhwxc- ♂ (49 bytes) () 08/05/2010 postreply 10:35:35

• have you changed the seals? -隱睾- ♂ (0 bytes) () 08/04/2010 postreply 16:22:06

• No. Valve job needs some special tools. -biglow- ♂ (0 bytes) () 08/04/2010 postreply 20:56:43

• you just need a valve spring compressor -xxhhwxc- ♂ (34 bytes) () 08/05/2010 postreply 10:38:08

• 回複：給xxhhwxc，關於valve seal -亂猜- ♂ (249 bytes) () 08/04/2010 postreply 20:13:15

• Thanks Biglow!! my valve seal issue -wenxue06- ♀ (501 bytes) () 08/05/2010 postreply 09:11:40

• Go to a shop if you have too much money to throw away -xxhhwxc- ♂ (237 bytes) () 08/05/2010 postreply 10:44:03

• Super Thanks! I will check it often -wenxue06- ♀ (37 bytes) () 08/05/2010 postreply 11:18:33

• If car needs 1 qt oil every 500 miles, it probably -khyang86- ♂ (198 bytes) () 08/05/2010 postreply 11:18:59

• 回複：If car needs 1 qt oil every 500 miles, it probably -Yangtze430030- ♂ (105 bytes) () 08/05/2010 postreply 12:19:48

• 回複：回複：If car needs 1 qt oil every 500 miles, it probably -khyang86- ♂ (397 bytes) () 08/06/2010 postreply 10:25:02