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  1. #1

    Join Date
    Nov 2011
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    6
    Location
    Georgia
    Mower
    Craftsman

    Oil leaking from exhaust

    I have a Craftsman push mower with a Briggs engine. The engine use to be easy to start, always on the first try. Lately it hasn't been so easy and sometimes I can feel it pull back when I pull it. Then the other day when I was using it, it started smoking terribly. White smoke. After I stopped it I noticed motor oil leaking from the exhaust. Any ideas? The mower has not been tilted at any great angle.

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  3. #2

    Join Date
    May 2010
    Posts
    5,445
    Location
    Kansas, Butler county, Just east of DooDah
    Mower
    CTL

    Re: Oil leaking from exhaust

    Hello & WELCOME to LMF...

    Check the OIL Level... It is very likely Over Full... Because (while the engine was NOT running), Gasoline has ran into the carb... then into the cylinder ... and then into the crankcase, over filling the oil and causing your problems.
    You will need to drain all the oil, put in fresh and fix the needle seat leak in the float bowel, and or inssstall a fuel shut off (in the fuel line) to prevent this in the future... KennyV
    Last edited by KennyV; 11-23-2011 at 02:33 PM.

  4. #3


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    jmurray01's Avatar
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    Apr 2011
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    Location
    Scotland
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    Sterling Cyclone with Tecumseh Vantage 35

    Re: Oil leaking from exhaust

    I agree with Kenny, it sounds like your carburetor is letting too much fuel through and it is seeping into the crankcase which will cause an oil/fuel mixture to get into the combustion chamber and if it can't all be burnt (as it won't be able to at that rate) it'll go through the exhaust valve as liquid and then out the exhaust.

    Get it fixed ASAP, as running a mower with fuel in the oil won't be doing the bearings or piston any good, and the oil/fuel coming out of the exhaust is a fire hazard.
    Live every day as if it's your last - because one day - it will be.


  5. #4

    Join Date
    Mar 2011
    Posts
    880
    Location
    Washington
    Mower
    honda 1031, cub cadet 2164, jacobsen park 30, simplicity

    Re: Oil leaking from exhaust

    Yes to all of the above. That gas/oil mix is particularly nasty inside an engine.

  6. #5

    Join Date
    Nov 2011
    Posts
    6
    Location
    Georgia
    Mower
    Craftsman

    Re: Oil leaking from exhaust

    Today I checked the oil and it was a little high. I don't know what real high would even look like on the dip stick I dont guess but it looked to be about 3/16 past the full mark. Thats what like 4- 5mm.
    I drained the oil and put in some more. Then checked the air filter. No oil on it but was very dirty so I changed it. Then I pulled out it spark plug. It was covered with oil, so I changed it too.
    I started it and it was still smoking like crazy, so I stopped it. I started it a few more times after that and it seemed like each time it was getting a little better, then the last time there was no noticeable amount. I think it just needs to burn up all the oil that is in there. Is there anything I could pour into the fuel system that would help it?

  7. #6


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    jmurray01's Avatar
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    Re: Oil leaking from exhaust

    Quote Originally Posted by Cdy291 View Post
    Today I checked the oil and it was a little high. I don't know what real high would even look like on the dip stick I dont guess but it looked to be about 3/16 past the full mark. Thats what like 4- 5mm.
    I drained the oil and put in some more. Then checked the air filter. No oil on it but was very dirty so I changed it. Then I pulled out it spark plug. It was covered with oil, so I changed it too.
    I started it and it was still smoking like crazy, so I stopped it. I started it a few more times after that and it seemed like each time it was getting a little better, then the last time there was no noticeable amount. I think it just needs to burn up all the oil that is in there. Is there anything I could pour into the fuel system that would help it?
    You could try some of that fuel system cleaner additive you can buy for vehicles, but I'd suggest just running it on pure gasoline and let it naturally clean itself out.

    Hopefully it will stop giving you problems now, but if it persists, just come back here and we'll help you!
    Live every day as if it's your last - because one day - it will be.


  8. #7

    Join Date
    Mar 2011
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    880
    Location
    Washington
    Mower
    honda 1031, cub cadet 2164, jacobsen park 30, simplicity

    Re: Oil leaking from exhaust

    Quote Originally Posted by Cdy291 View Post
    Today I checked the oil and it was a little high. I don't know what real high would even look like on the dip stick I dont guess but it looked to be about 3/16 past the full mark. Thats what like 4- 5mm.
    I drained the oil and put in some more. Then checked the air filter. No oil on it but was very dirty so I changed it. Then I pulled out it spark plug. It was covered with oil, so I changed it too.
    I started it and it was still smoking like crazy, so I stopped it. I started it a few more times after that and it seemed like each time it was getting a little better, then the last time there was no noticeable amount. I think it just needs to burn up all the oil that is in there. Is there anything I could pour into the fuel system that would help it?
    Maybe a shot of Sea-Foam, per recommended mixing instructions, but otherwise, as you've discovered, it'll take some time to burn off the residue. Keep a close eye on your oil level, your carb may need some attention.

  9. #8

    Join Date
    May 2011
    Posts
    224
    Location
    Inside the Beltway in Virginia
    Mower
    Old Honda HRS-21

    Re: Oil leaking from exhaust

    Given that it happened suddenly and the oil isn't too high, I'm thinking that the exhaust valve seal is the issue. Not an easy fix.

  10. #9

    Join Date
    May 2010
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    Kansas, Butler county, Just east of DooDah
    Mower
    CTL

    Re: Oil leaking from exhaust

    Quote Originally Posted by Mini Motors View Post
    Given that it happened suddenly and the oil isn't too high, I'm thinking that the exhaust valve seal is the issue. Not an easy fix.
    This is on a Briggs engine...
    Is there any type of valve guide seal on a briggs???
    I can't place seeing any... But?? KennyV

  11. #10
    Mowerdawg's Avatar
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    Nov 2011
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    Location
    Tennessee
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    All of them............

    Re: Oil leaking from exhaust

    Prior to all this, was it using oil extensively? Had you added any just prior to this happening?
    and he's right, exhaust seal......no fun...I'd rather unbolt the blade and engine and replace with a good on off a 25 dollar mower.....but that's me........
    ~ Live everyday as thou your last. For one day, your sure to be right ~

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