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    booger32's Avatar
    booger32 Posts: 1, Reputation: 1
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    #1

    Apr 22, 2011, 06:49 PM
    Why does a bad dipstick o-ring cause oil to puke out of breather?
    Briggs Stratton 9 hp on rear engine snapper. Runs for a couple of minutes then oil/gas mixture blows out of crankcase breather tube... with a lot of pressure. I've seen this problem posted several times and often the o-ring on the dipstick tube is mentioned as the culprit. Why?
    DG's Avatar
    DG Posts: 1,375, Reputation: 109
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    #2

    Apr 23, 2011, 05:35 AM

    If its sucking air in , it has to go out some where. And that's the path of least resistance.
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