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    I'm No Expert Shaun's Avatar
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    Default white smoke...

    Well the motor runs strong, sounds good, but when it's idleing i can bearly see alittle bit of white smoke when it's running out of the right (even side) bank. I'm pretty much positive i know what cylinder is causing the problem because when i pulled the plugs last time the number 6 plug was black and oily looking. When i saw i see white smoke at idle, i'm talking like you have to be up close and looking at exhaust to see it so it's not a huge amount but what does suck is at startup. When i start it up after i had shut it down and let it sit for a while a nice puff of white smoke comes out and then it cleans up. What do you guys think this could be, i'm guessing there's pretty much nothing i can do to fix this other than tear it down?

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by Shaun View Post
    Well the motor runs strong, sounds good, but when it's idleing i can bearly see alittle bit of white smoke when it's running out of the right (even side) bank. I'm pretty much positive i know what cylinder is causing the problem because when i pulled the plugs last time the number 6 plug was black and oily looking. When i saw i see white smoke at idle, i'm talking like you have to be up close and looking at exhaust to see it so it's not a huge amount but what does suck is at startup. When i start it up after i had shut it down and let it sit for a while a nice puff of white smoke comes out and then it cleans up. What do you guys think this could be, i'm guessing there's pretty much nothing i can do to fix this other than tear it down?
    Shaun, Need info on the boat to think. M

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    I'm No Expert Shaun's Avatar
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    Senior Member ol guy's Avatar
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    Quote Originally Posted by Shaun View Post
    Well the motor runs strong, sounds good, but when it's idleing i can bearly see alittle bit of white smoke when it's running out of the right (even side) bank. I'm pretty much positive i know what cylinder is causing the problem because when i pulled the plugs last time the number 6 plug was black and oily looking. When i saw i see white smoke at idle, i'm talking like you have to be up close and looking at exhaust to see it so it's not a huge amount but what does suck is at startup. When i start it up after i had shut it down and let it sit for a while a nice puff of white smoke comes out and then it cleans up. What do you guys think this could be, i'm guessing there's pretty much nothing i can do to fix this other than tear it down?
    Shaun, run a compresion check first and call me back. M

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    Cantard 71hallett's Avatar
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    My guess is that if its a bbc it is leaking water past an exhaust guide or the guide has a crack in it.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    My immediate guess would be guides but a leak down would help to determine if is rings. Ususally leaky guides puff smoke on start up then the smoke will disapate.

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    I'm No Expert Shaun's Avatar
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    I should have gave this info in the original post but i did do a comp test a few months back when i was searching for my noise problem. All cyl where right around 180-185 if i remember correctly.

    Before i put this motor together i gave bob mckray (think thats the spelling) these heads bare and he checked and assembled them.

    ok, i've done a leak down before but it was a long time ago in autoshop, can anybody give me the proceedure again. From what i remember you do a comp test, then little oil in the cyl and do another comp test.

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    Senior Member Gravyboat's Avatar
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    Cylinder Leak Down Testing

    How to Use a Cylinder Leakdown Tester


    http://www.carcraft.com/techarticles...ter/index.html

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    I'm No Expert Shaun's Avatar
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    How am i suppose to tell if it's a guide or not, from those instructions it tells you if your loosing comp through rings, int valve, or ext valve...

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by Shaun View Post
    How am i suppose to tell if it's a guide or not, from those instructions it tells you if your loosing comp through rings, int valve, or ext valve...
    Check that first then if they are good........
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Quote Originally Posted by Shaun View Post
    How am i suppose to tell if it's a guide or not, from those instructions it tells you if your loosing comp through rings, int valve, or ext valve...
    Listen to where the compression is going, pull the valve covers and LISTEN. If you are doing a leak down you do it with the valves adjusted and again with the valves backed off. Leak no leak heads or rings.M

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    I'm No Expert Shaun's Avatar
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    ok, so my guess here is that if the leakdown reads good, minimal leakage that it's probably the guides leaking? Anyway to know for sure, could i look down the intake port and see maybe a oily port?

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    gn7
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    shaun, it's a valve guide seal. Are you running PC type or umbrella type. If its, a PC type, maybe came loose from the guide, if umbrella seal then maybe the guid is a little loose, but if definitely valve relateded. When you shut it off, any oil on the stem can run down past the seal and shows up when you fire it off. Smokes the most when the motor is stone cold, less when refired after setting awhile, and vertually nothing once it's warm and running. If it doesn't show up to bad on you plugs I wouldn't worry to much about it, unless it really bothers you.



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    Senior Member Gravyboat's Avatar
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    You are certain that this white smoke is isn't just some steam or a water related problem and the oil on the plug isn't something else?
    I might be wrong, but it should give a puff of blue smoke if it's valve guide or seal related.

    At this point, I wouldn't make too big a deal out of it. If it's not blowing constant or making any unusual noise, I'd say just keep on running it and enjoy the coming summer unless it becomes worse. At the very least, pull the valve cover on that side and visually inspect that the seals (the perfect circle type) are seated down on the guide. I have on more than one occasion found a seal or two taking a joy ride up on the valve stem.
    I think you've done all you can so far without actually tearing into it. With that being said, there's always SOMETHINGthat needs attention with these kinds of boats. I'm right there with ya. I've got a loose stringer that needs replacing but just not right now.

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