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Air sep oil drip

Discussion in 'Technical Discussion' started by Boomer, Jul 28, 2020.

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  1. Boomer

    Boomer Senior Member

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    Seminole
    Got black oil dripping from my port motor air sep...which goes to the turbo...do they normally leak (1/3 shot glass over several weeks) or am i looking at a rebuild on that turbo? Last replaced in 2014 or so they said...thoughts?
  2. chesapeake46

    chesapeake46 Senior Member

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    Dont Airseps use the turbo vacum on the engine and draw oil vapor from the block allowing it to burn off with fuel ?

    If that is so then it could be a loose fitting on the bottom of the Airsep allowing the condensed oil to escape when at rest ?
  3. Boomer

    Boomer Senior Member

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    I dunno...waiting for the experts to chime in...only one motor is doing it which gives me pause to contemplate before our big trip in 2 weeks for 2 weeks...the oil is definitely coming from the inside of the air sep where the filter comes off
  4. Capt Ralph

    Capt Ralph Senior Member

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    The Walkers collected oil drains back into the engines sump. There is a check valve that allows oil to drain back but when running hard.
    The return drain, return drain hose or valve may have clogged up. Believe it or not, it's usually the drain from the Walker case, then the check valve.
    The older Walkers really sucked in this. The newer Walkers with the serviceable oil separator works much better.
    First, ensure the case drain is pointing straight down. Many installs I have improved just by inserting a 45 elbow on the bottom of the case to help draining when other engine hoses or options are in the way.
    Also, if the engine is really blowing lots of crank case gasses including it's oil mist, it could over run the Walker system and cause it to over flow.
    Issues on new engines when the rings have not set in or old engines when the rings are worn out.
    Bad valve guides also can over run a Walker CCV system.

    However, I'm a Racor CCV guy. A much superior system. I just have the normal DDC oil leaks (everywhere)...
    Last edited: Jul 28, 2020
  5. Capt Ralph

    Capt Ralph Senior Member

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    Salon A/C fixed? You coming up here?
    I'm out of quarantine in a few more days.
  6. Boomer

    Boomer Senior Member

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    AC not fixed yet...few more days...folks are in stuart...heading over to see them for their 60th as the trip we had planned for them across the pond was cancelled...leaving the 14th now
  7. AIRSEP Guru

    AIRSEP Guru New Member

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    Hey Boomer,

    The AIRSEP should have NO oil leaking. Can you determine if the oil is at the drain port...or at the edge where the air filter element meets the black body? How old are the units?
  8. Boomer

    Boomer Senior Member

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    Where the filter meets the body..age unknown as they came with the boat
  9. AIRSEP Guru

    AIRSEP Guru New Member

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    Boomer,

    The older or "Traditional" AIRSEPS nave an epoxy joint where the outer shell, meets the inner shell. After you remove the air filter element, wipe the channel that receives the bottom of the air filter. That is where the joint is. It is possible that if a mechanic overtighted the DDC clamp/mount during it's life, the aluminum housing flexed at a different rate than the epoxy and compromised the seal. If the units are anywhere near 8 years old or older, I would suggest you replace the unit or at the very least the black AIRSEP body. Walker still makes the older style units as service parts, although a new complete assembly is probably not much more than the black AIRSEP body alone. Hope that is helpful.
  10. Boomer

    Boomer Senior Member

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    Thank you sir...that help immensely
  11. AIRSEP Guru

    AIRSEP Guru New Member

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    Happy to help. :) If you need to inquire about replacements, they have a general email for price and availability.

    (mod edit: email removed)
    Last edited by a moderator: Aug 12, 2020