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  • Engine: burping oil

    Our 289 is burping oil up through the filler tube. Is this a PCV issue and, if so, where is the best place to relieve crank case pressure?

    Regards,
    John Brayton

  • #2
    Oil is blowing out of the fill tube because the by-pass oil filter drains back through the filler tube. There should be a baffle in the filler tube to prevent the oil from blowing out of the tube. You didn't specify the year of your car so there may or may not be a PCV valve installed. The problem is usually caused by excessive pressure in the pan caused by worn compression rings allowing excessive blow-by. You can install a late model valve cover that has the provision for a breather cap, that will lower the amount of pressure blowing back theough the filler tube. Bud

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    • #3
      Originally posted by Bud View Post
      Oil is blowing out of the fill tube because the by-pass oil filter drains back through the filler tube. There should be a baffle in the filler tube to prevent the oil from blowing out of the tube. You didn't specify the year of your car so there may or may not be a PCV valve installed. The problem is usually caused by excessive pressure in the pan caused by worn compression rings allowing excessive blow-by. You can install a late model valve cover that has the provision for a breather cap, that will lower the amount of pressure blowing back theough the filler tube. Bud
      Hi Bud,

      The engine is from an early 62 Hawk and there are baffles in the filler tube. I'll see if I can get newer valve covers that have a provision for a breather cap.

      Thanks,
      John Brayton

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