Crankcase breather leaking oil
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Thread: Crankcase breather leaking oil

  1. #1
    Full Member x360x64dart's Avatar
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    Crankcase breather leaking oil

    Got home from taking my car to buddies shop and noticed decent amount of oil in driveway after letting idle there for a minute or so. Appears to be coming from breather on passenger side valve cover. Any thoughts? Motor is a '76 360. He did an oil change on it, possibly to full? To high of RPM down the freeway? I was mostly running at 3k but ran up to 4k and 5k but not for long. Or possibly maybe needs a new seal?
    Thanks

    Here's a few pics just cause its been a while since I've been on.
    Skid marks can be a good thing.

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  3. #2
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    Blow by

    Either the PCV valve is broken or plugged, or the PCV hose is sucked flat inside, or you have too much blow by due to piston, ring, or cylinder damage. A blown head gasket will certainly cause too much blow by, and a telltale miss to boot.
    First thing to do is pull the PCV valve out of its grommet and start the engine, there should be a lot of sucking going on in the valve, if not find out why. If it is sucking real good then you have engine damage and the resulting excess blow by is causing the drip.
    Your breather should be connected to the air cleaner with a piece of heater hose so that blow by during WOT is directed into the carburetor air stream rather than allowed to drip or be blown all over the place. Pretty chrome parts aren't always the best answer, but if this is a new problem that appeared instantly out of nowhere then I don't think we can blame them.
    Steve

  4. #3
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    Leaking valve cover breather

    Noting that the breather is located at the rear may note that it is picking up oil from a oil drain that is plugged or to small from for a high output oil pump also make sure there is a proper baffle inside the cover, may be as simple as swapping that cover to the other side !!!

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  6. #4
    Full Member Demonracer's Avatar
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    Do the valve covers have baffles below the PCV valve & the oil filler plug?

  7. #5
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    Oil Leakage

    Quote Originally Posted by Demonracer View Post
    Do the valve covers have baffles below the PCV valve & the oil filler plug?
    Easy just pull the item and put a screwdriver in the hole and if it goes more than and inch it will NOT have a baffle.

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