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oil in air filter box

Discussion in 'Ford Trucks' started by WHITE=GREEN, Dec 11, 2001.


    WHITE=GREEN Senior Member
    Messages: 161

    upon a recent inspection of my air filter ive noticed a small amount of engine oil laying in the bottom of my air box. i cleaned it out and a week later i checked again and it was back again. my first idea was to check the pcv valve but my truck (97' , F-350 , 460, auto, 48,000 miles) doesnt have one. any ideas what may be going on? does not seem to have loss of power or use oil. thanks in advance for any ideas/help.
  2. thelawnguy

    thelawnguy PlowSite.com Addict
    Messages: 1,011

    It has a PCV system. Probably just a vacuum tube somewhere going into the bottom of the carb.

    A sludged up engine will also let oil from the crankcase air intake pipe back up into the filter. So can a well-worn (read: excessive blowby) engine.
  3. RCIPlow

    RCIPlow Member
    Messages: 86

    My 90 F250,460 5 speed has a pcv. Looking at motor, left sideleft rear of valve cover, gottatake a close look, but it should be there.

    "Give me a cold front and a warm rear!"
    Tim McGonigal
    Atco, NJ
  4. CT18fireman

    CT18fireman Banned
    Messages: 2,133

    That should be the cause of the problem. I have seen this on quite a few motors. Not just Fords.