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exhaust under valve cover

Discussion in 'General Tech and Maintenance' started by 90crxb16a, Jan 10, 2004.

  1. 90crxb16a

    90crxb16a Senior Member

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    just picked up this b18c and when you look under the oil cap there is alot of exhaust. more then i think is normal.
    any ideas? i will be doing a compresion test on it tonight.

    could it have anything to do with a pcv valve(crank case vent?????)
     
  2. K2e2vin

    K2e2vin Senior Member

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    what the hell is exhaust doing in valve cover? theres supposed to be nothing other than valvetrain and oil.
     
  3. Captinb16

    Captinb16 Member

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    exhaust or steam?? look at your dipstick and see what it looks like.
     
  4. Iquark

    Iquark Senior Member

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    Do you mean black soot?
     
  5. swapdohc

    swapdohc Member

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    I just picked up a 93 civic hb with a jdm b18c ® and it is doing the same exact thing. At idle it is pushing a ton of exaust out of the oil fill (on the valve cove). When you rev it up it disipates quite a bit but is still there. It is more exhaust than could possibly squeeze thru a bad valve stem seal, even if they all were bad. Any Ideas please help :(

    Thanks
     
  6. arpee79

    arpee79 Senior Member

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    Hehehe (swapdohc) I just wanted to tell you i like your SIG.


    " It's not what you can "BUY" But what you can build. " WeRd
     
  7. JDMilan

    JDMilan Senior Member

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    hmm,,,valve guides?
     
  8. Jim Truett

    Jim Truett Senior Member

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    Maybe piston rings. It could be blowby.
     
  9. lude68

    lude68 Senior Member

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    Ive had the same thing happen in my 1st honda and its not exhaust..its really just heavy steam from the heat inside of the head.
     
  10. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    that sounds like it makes a lot more sense :hmm:

    :shrug:
     
  11. lude68

    lude68 Senior Member

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    why wouldnt it make a little more sense? Its not exhaust from the combustion chamber but a heavy steam (ever change your oil and hot steam come out of your oil cap when your car is still hot and it doesnt have oil in it yet?
     
  12. Canuck 93 Civic Si

    Canuck 93 Civic Si Senior Member

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    Its not steam and its not exhaust. Its oil vapour. When the oil gets hot and the engine parts are splashing it around all over the place, it tends to vaporise a little. Thats why you need a crack case vent. The PCV ( positive crankcase ventilation ) valve lets the vapour out of the vavle cover ( highest part of the engine ) and sends it into the intake to be burned. Sometimes you get oil going out the PCV and that is why people install oil catch cans.
     
  13. cws13

    cws13 Senior Member

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    WTF, I thought that that steam came from burning Halogen fluid in my muffler bearings...I'm getting another beer before I investigate. :D
     
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