Shovelhead instant smoke both cylinders

Discussion in 'Classic Models' started by greenchopper, Jun 2, 2010.

  1. greenchopper

    greenchopper Member

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    76 Shovelhead _ 93ci

    Left gas petcock open position all night causing a fuel flooded engine. Fired up but missing bad. Tried to drive the plugs clean but started blowing gas out of front cylinder exhaust pipe. Pulled back inside garage, removed and cleaned plugs. with plugs out front cylinder a little warm and rear cylinder hot, blew compressed air into spark plug holes and up both exhaust pipes. was at work so tried to drive home and engine started running very rough about half way home popping flames out exhaust. Replaced plugs and now it runs great again but smokes like crazy. Smoke is worst when engine rpm is dropping ( when let off throttle). Front cylinder cleared upa little today but rear cylinder is still smoking very heavy.
    Valve guides?
    Valve guide seals?
    Clogged return somewhere?
    Breather not working?
    Head gasket open oil channel to cylinder?

    Please help...
    Thanks,
    Greg
     
  2. Breeze3at

    Breeze3at Well-Known Member Contributor

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    White or black smoke? White(ish) smoke is engine oil, black is fuel. Depending on what type exhaust you have, gas could have soaked into the packing or the carbon and is burning off.
     
  3. greenchopper

    greenchopper Member

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    Had just added a quart of synthetic 20w50 a week prior and when checked tanks was almost empty ( about half inch on stick). It is definitely oil smoke and using oil very fast.
     
  4. Jack Klarich

    Jack Klarich Expert Member Contributor

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    Change the oil and try again sounds like the case filled with gas check your float level too:D
     
  5. 59Panhead

    59Panhead Member

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    shovel heads dont use 20-50 oil your supposed to run 60 wt ! That could be why its smoking! The oil is toooooooo THIN for the Shovel and leaked past the rings and is blowing out the back!
     
  6. Super76

    Super76 New Member

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    I use the 20-60 in both my shovels. Nothing wrong with multigrade in a shovel. In fact, it's ideal :)
     
  7. BUBBIE

    BUBBIE Well-Known Member Contributor

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    Liquid DOES NOT compress.... If cyl was Full of Gas, and you kicked it over, You probably broke a piston or it cracked... Or even could of Bent a rod.

    I would check the compression and go from there... Perform an oil and filter change, New plugs.
    I also would use Only 50w winter - 60w summer. (.)

    signed....BUBBIE
     
  8. Hoople

    Hoople Account Removed

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    I agree with Bubbie. Sounds like a Hydro-lock. Not but a week ago, I pulled the heads on a Hydro-locked marine Chevy 5.0 engine. What a mess.

    Check the compression.
     
  9. Jack Klarich

    Jack Klarich Expert Member Contributor

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    Agree with Hoople, squirt some oil down the cylinders and see if the compression changes, may need a top end job, not too bad to do :D
     
  10. m1marty

    m1marty Member

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    Nothing wrong with running 20/50 in a Shovel.