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Thread: New member with an oil leak question

  1. #1
    Join Date
    Dec 2012
    Location
    Mesa, AZ
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    Default New member with an oil leak question

    My son's 90 4.0 has an oil leak that I'm trying to diagnose. The emissions junk has been removed from the rig, ie the airbox, etc. The forward hole in the valve cover I believe originally contained a tube going to the factory airbox/intake, but since the removal of both of those items, the po stuffed a chrome "Mr. Gasket" oil breather in that hole, which now appears to be puking oil out while driving.

    SO, the question- is this to be expected with a jury-rigged setup such as this? OR, do you think there's some engine problem causing excess pressure under the valve cover and expelling oil out the breather?

    Thanks!
    Tony

  2. #2
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: New member with an oil leak question

    There are two breathers. The other one plugged?
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    Join Date
    Dec 2012
    Location
    Mesa, AZ
    Posts
    22

    Default Re: New member with an oil leak question

    I'll check into that tomorrow- thanks!

  4. #4
    oderdene's Avatar
    oderdene is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: New member with an oil leak question

    check rearmost (firewall side) breather, it clogged and make pressure thins to make blow by.
    '91 XJ Limited | 4.0 H.O. I6 | AW-4 | NP242J | D30 | C8.25 | BFG KM2 33x10.50x15 | front winch bumper ...

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