can't stop it from smoking
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Senior User
Joined: Jan 2006
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From: Dillon, Colorado
can't stop it from smoking
I have a 72 camper special with a 390. The situation is: it won't smoke at all until warmed up. Than it smokes when revved. And REALLY smoke when I let off the gas going down the highway. I read here before that fe's are prone to intake gasket leakage, so I replaced it, and it still smokes.
Does this sound like worn rings? if so is there any additive that could help (I realize it won't fix) this problem. She runs great, I just feel bad about the smoke screen. Any help would be great.
Does this sound like worn rings? if so is there any additive that could help (I realize it won't fix) this problem. She runs great, I just feel bad about the smoke screen. Any help would be great.
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Senior User
Joined: Jan 2006
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From: Dillon, Colorado
thanks for the response. Oil is not pooling. I have a set of valve covers I cut a long hole in, in order to watch for that. I have not checked valve guide seals. Can you check them visually? And, for the record, you think it sound like something other than rings?
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Joined: Feb 2005
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I'm one that has had a ton of problems with my engine smoking after rebuild. On mine I could see that the intake manifold ports were dry but the intake ports in the head were wet with oil. I also could see that the bottom of the intake manifold gasket was wet with oil. I had installed an aftermarket aluminum intake, the edelbrock performer RPM. I really believe this is more an issue for the aluminum intakes...you have to be careful to get it all right or it will leak. I made the mistake of using a standard felpro intake manifold gasket. Edelbrock recommends the felpro printoseal intake gasket. I've also heard that Mr. Gasket makes a better intake gasket to use.
Good Luck!
Tracy
Good Luck!
Tracy
Post Fiend
Joined: Jan 2003
Posts: 8,600
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From: Iowa
That does sound like rings. Check the valve stem seals though before you settle on it being rings, as valve stem seals are a lot easier to fix.
If it is rings, a higher viscosity oil should help to cover up the problem.
It could be one or more stuck rings. This is where they are stuck in the piston due to deposits, and dont ride on the cylinder wall as they should. Obviously this lets more oil by.
In either case, switch to a heavier oil like 15w40 and drive it for a while and see if the problem improves. I recommend a diesel rated oil due to the increased level of additives, specifically in your case detergents to help free up the rings. Look for the CI-4 rating.
If it is rings, a higher viscosity oil should help to cover up the problem.
It could be one or more stuck rings. This is where they are stuck in the piston due to deposits, and dont ride on the cylinder wall as they should. Obviously this lets more oil by.
In either case, switch to a heavier oil like 15w40 and drive it for a while and see if the problem improves. I recommend a diesel rated oil due to the increased level of additives, specifically in your case detergents to help free up the rings. Look for the CI-4 rating.
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Joined: Oct 2004
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From: Port Alberni
I"m lookin at the almost same proplem,I"m looking to buy a 76 H/B with a 390.He says that there is no smoke on startup or normal driving,the only time it smokes is when the pedal is to the floor.Any ideas
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From: Dillon, Colorado
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Post Fiend
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From: Iowa
Originally Posted by 66f14evr
I"m lookin at the almost same proplem,I"m looking to buy a 76 H/B with a 390.He says that there is no smoke on startup or normal driving,the only time it smokes is when the pedal is to the floor.Any ideas
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Fleet Mechanic
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From: Montana
You might be able to pour a tiny bit of oil in each cylinder and then run it....it helps re-seat the rings in some cases, then after you run it for a few minutes it should clear up. Just a cheap chance at fixing it.
Senior User
Joined: Feb 2006
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Put a set of valve stem seals on it and see what happens. Its quick, cheap, and will help isolate or eliminate other potential problems. If it don't get better then you're going into it anyways...have you tried a leakdown or compression check yet?