oil leaking from exhaust

kevbocometh(7)July 18, 2008

i'm fixing my neighbors lawn mower for him, i thought it would be the usual; punky gas, bad plug, clogged filter or any combination of the 3. oops, my bad i pulled the cord once and it started leaking oil out of the exhaust. it's a murray mower with a real cheap-o briggs 4hp engine. has anybody ever heard of such a thing...does that even make sense? how does the oil get all the way through the exhaust? maybe he tipped it and it got in there once and this is just the long term results? please help, i owe this guy money:) sorry for no engine description, i'll update later, Thanks to everybody in advance.

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1saxman

Check the oil and make sure its not overfilled. Either he or you may have tilted up the mower with the carb side down which can flood the intake tract with oil. Frequently this will 'hydro-lock' the engine to where you can't turn it over. Pull the spark plug and ground the wire - pull the engine through several cord pulls to blow the oil out of the cylinder. Check the air filter - a paper filter will usually be oil-soaked and should be replaced. A foam filter should be cleaned and re-oiled, or at least squeezed out to remove excess oil. The engine will smoke for several minutes after starting as the oil burns out of the works.

    Bookmark   July 18, 2008 at 4:24PM
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lb1kenobi

My MTD edger/trencher has similar symptoms as the above poster , but gas is leaking out of the muffler not oil. Has the metal gas tank with the plastic carb pickup tube mounted on top of the tank. Is there a simple fix for this? The engine is a 4.5hp B&S.

    Bookmark   March 30, 2011 at 3:08PM
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