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View Full Version : Why does a bad dipstick o-ring cause oil to puke out of breather?


booger32
Apr 22, 2011, 06:49 PM
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
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.