puffs of smoke

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puffs of smoke - 8/13/2007 5:16:41 PM    batesy80   Posts: 61 Joined: 7/15/2007 Status: offline Hey guys, I have an 80 L48 and when its been running for a while or better yet , gone for a ride, on restarting it blows a small puff of smoke. I was told it most likely needs new valve seats. I just changed over to syn. oil but it smoked before that,  It has 65,000 so called orig. miles on her, other than that she runs great, but want to get it fixed before it gets worse. Any thoughts that might help? Thanks Scott Post #: 1

RE: puffs of smoke - 8/14/2007 4:51:16 AM    78buckshot   Posts: 654 Joined: 1/28/2007 From: Michigan Status: offline Good morning 80, it's not the valve SEATS that cause smoke on start-up or deceleration, it's the valve SEALS, these are rubber o-rings that are fitted around the valve stem and seat against the retainer to keep oil from running dowm the stem into the combustion chamber. As long as your in there you can add another type of seal that fits around the valve guide, the two combined will reduce oil consumption quite a bit. (in reply to batesy80) Post #: 2

RE: puffs of smoke - 8/14/2007 5:43:14 AM    C3 Starship Posts: 4761 Joined: 7/25/2006 Status: online  Bad valve seats would only effect compression. There isn't any oil in the seat area to leak into the cyl. So,......yup, it's the seals. _____________________________ 1980 L-82 Fastback (forward too) Mono composite front and rear. Full adjust ride height and response. 400+ hp, 454, M-22, 3.07 http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg 2007 H. D. Sportster, XL 883 EFI (in reply to 78buckshot) Post #: 3

RE: puffs of smoke - 8/14/2007 6:32:47 AM    Rich G.   Posts: 107 Joined: 1/12/2007 Status: offline What Chevy doesn't smoke when you start it? Like the other guys said it's probably the seals or the valve guides could be worn also which makes things worse if the seals are worn also. If it just gives a puff of smoke when you start it, it isn't worth the aggravation to change the seals. I would drive it and have fun. It's not going to cause any damage. (in reply to C3 Starship) Post #: 4

RE: puffs of smoke - 8/14/2007 9:20:10 AM    pg Posts: 1044 Joined: 8/7/2006 Status: offline Hi Batesy, if the smoke bothers you and you want to change the seals it's on page 2A-4 under # 5 in haynes. PG _____________________________ my Vettes birthday, May 1, 1974 (in reply to Rich G.) Post #: 5

RE: puffs of smoke - 8/14/2007 12:02:52 PM    batesy80   Posts: 61 Joined: 7/15/2007 Status: offline My bad ,I meant to type seals. Thanks for the replies everyone. You sure it won't create probloms? I'm not a big engine guy, but can hold my own with mechanical stuff. If it's not an issue I will wait a bit to take care of other items. Thanks again and here's a pic. of my ride, stole it for $6400 Attachment (1) (in reply to pg) Post #: 6

RE: puffs of smoke - 8/14/2007 4:41:00 PM    SCHOON Posts: 328 Joined: 9/8/2006 Status: offline My 74 has been know to blow some smoke on start-ups. In my case it's not oil but fuel (white/gray) smoke. If you are blowing (white/blue) it's oil. You should be able to smell the oil. Either way I would not worry about it until it starts blowing smoke when you are driving around. (in reply to batesy80) Post #: 7

RE: puffs of smoke - 8/16/2007 9:24:50 PM    73shark Posts: 1097 Joined: 4/18/2006 Status: offline If a new set of o-ring type seals doesn't stop the smoke at startup, then your valve guides are probably worn and need refreshing.  The umbrella seals  that fit on the valve guide boss really don't allow enuf oil to the guides. _____________________________ So many toys, so little time (in reply to batesy80) Post #: 8

RE: puffs of smoke - 8/18/2007 3:54:04 AM    Texas Jim   Posts: 445 Joined: 12/15/2005 Status: offline    78Buckshot said it, it's the seals.  And "Schoon,"  BLACK smoke is excess fuel. (in reply to 73shark) Post #: 9

RE: puffs of smoke - 8/18/2007 1:57:47 PM    batesy80   Posts: 61 Joined: 7/15/2007 Status: offline Thanks all, I don't feel as bad as the guy in the C4 I saw today. He had smoke every time he got on it (in reply to Texas Jim) Post #: 10

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