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Thread: What would cause oil in exhaust?

  1. #1
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    What would cause oil in exhaust?

    I have oil coming out of my port exh pipe.
    What would cause this????????????

    Broken ring?????????????????

  2. #2
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    A bad oil cooler will put oil into the cooling loop.
    Maddy's Daddy
    L.I.,N.Y.

  3. #3
    mrfixxall Guest

    Fixx

    +1,,if its alot then suspect a bad cooler..bypass the oil lines and see what happens.

  4. #4
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    Wouldn't a leaking oil cooler put oil into the entire cooling system? In which case you would see oil coming out of both sides of the exhaust?

  5. #5
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    Bad valve guides or valve guide seals. +1 for Blackhawk. Port side only would lead me to believe port side problem.
    1999 16 Classic Black on White

  6. #6
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    when I had oil coming out of both pipes, $236 later for an oil cooler, I was set. If you disconnect the hoses from the oil cooler and can see milky oil, then that's your problem. but just one side has oil, maybe valve guide like they say. good luck, don't get caught being exxon valdez.
    2002 28ZX

  7. #7
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    more info

    Pulled the exh manifold today. Oil is coming from #5 cyl exhaust. It has to be a broken ring. Pulling the motor again tommorrow.

    I am getting to be real good at pulling and working on this motor. This will be 5 or 6 time the motor has been pulled for repair and I bought the boat 6 months ago. Tore motor down to crank twice already. (#1--cracked block, #2--spun main bearing--wrong flywheel on engine, #3--this BS)

  8. #8
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    Found the problem

    Circlips came out and wrist pin slid over and ate up the oil control rings.

  9. #9
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    Ouch! How's the cyl wall, able to hone it clean?
    Think Fast, Live Long!
    Humor Helps.

  10. #10
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    Cylinder is shot

    I wish I could hone it out!!!!!!!!!!!!!!!!!! Sleeve time.
    Mother F......!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  11. #11
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    Quote Originally Posted by flying tomato View Post
    I wish I could hone it out!!!!!!!!!!!!!!!!!! Sleeve time.
    Mother F......!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Any possibility to go larger in bore diameter for all 8-holes to increase your Cu. In. displacement, rather then to just sleeve that one cyl?

    Kinda like making lemonade or finding someone with a bottle of vodka when life throws you a lemon!
    Think Fast, Live Long!
    Humor Helps.

  12. #12
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    You can go .090 max oversize. Which would be a .043 max gouge. leaving .002 for honing

    What block are using ?
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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  13. #13
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    Too deep

    The groove is pretty deep. I think sleeve is best solution.

  14. #14
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    Wow that sucks! Who would have thunk it, a circlip!
    1999 16 Classic Black on White

  15. #15
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    Quote Originally Posted by hdsadey View Post
    Wow that sucks! Who would have thunk it, a circlip!
    There's a right & wrong way to install them, the chamfer or rounded side of the circlip must face inward to the wristpin and the sharp square edge to face outward from the piston otherwise it can be pushed out.
    Think Fast, Live Long!
    Humor Helps.

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