1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Puff Puff blue smoke

Discussion in 'Early CJ5 and CJ6 Tech' started by RJ'sCJ6, Oct 19, 2014.

  1. RJ'sCJ6

    RJ'sCJ6 Member

    When starting the engine there is a puff of blue smoke, is that the quiet before the storm? Doesn't last long. Am I looking at major engine work I'm the near future?

    Thanks
     
  2. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    IIRC blue smoke at startup that goes away is loose (worn) valve guides. Not terrible. Check the compression, wet and dry.
     
  3. jackdog

    jackdog Member

    I agree with timgr. When you shut off the engine oil drains down the valve guides into the cylinder. They make valve guide seals depending on your engine and if I recall you can put them in without removing the head.
     
  4. jaybird56

    jaybird56 New Member

    if it still runs good more likely valve steam seals , they go bad with age
     
  5. scoutpilot

    scoutpilot Member

    STEM seals. Not steam.
     
  6. jaybird56

    jaybird56 New Member

    excuse me i never said i could type
     
  7. 1960willyscj5

    1960willyscj5 Well-Known Member

    And the darn spell-checker never even blinks!
     
  8. PierreDnepr

    PierreDnepr Member

    Mine puff blue smoke when it get really hot - I noticed it when I did my last tune up - I let it idle a lot more than usual... on normal driving its OK (as far I as know) - Am I looking at the same issue (compression is good 120, 130, 125, 125), bad stem seal?
     
  9. RJ'sCJ6

    RJ'sCJ6 Member

    Thanks for the response. It's not too to bad, if there's even a thing, but something to keep an eye on.
    thanks again
     
  10. cookieman

    cookieman Member

    We understood the question...A lot of old folk can't spell ..(I am one of them)..it the love for jeeps ...that important here...some people are nit picker....