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Oil accumulates in air cleaner box in Briggs Vanguard

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dlt1945
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2018/11/02 10:56:20 (permalink)
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Oil accumulates in air cleaner box in Briggs Vanguard

I have a Vanguard model 354447 with 600 hrs. In a 618 Grasshopper mower that seems to operate properly. My question is the small breather tube from the top of the motor to the air cleaner box exit it’s close to the carb. and puddles some oil in the air cleaner box. Is the carb supposed to suck oil up through the tube or is there some type of defect in the breather system The motor runs strong, Good compression, No exhaust smoke. How much oil should the motor use in a 5 Hr period ?
any input would be helpful

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    Roy
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    Re: Oil accumulates in air cleaner box in Briggs Vanguard 2018/11/02 11:22:44 (permalink)
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    Welcome!! Normally there will be a bit of oil coming through the breather especially if operated on a slope. Are you frequently topping up?
    AVB
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    Re: Oil accumulates in air cleaner box in Briggs Vanguard 2018/11/02 13:58:27 (permalink)
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    Normally there will a little oil due that is the way the crankcase vent the piston rings blow-by gases. Most likely this has the graphite head gaskets and they could be leaking some in the the push rod galley of each head.
     
    Top determine the true health the cylinders you should do a leak down test check to see if there is any head gasket leakage. Note: Normal leak down is around 20% but can as much as 40% and still be considered good. You do however want both cylinders having about same leak down percentage rate for a balanced engine.
    Mrcalm
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    Re: Oil accumulates in air cleaner box in Briggs Vanguard 2018/11/03 23:09:45 (permalink)
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    Hello; You have probably done this already but make sure the oil isn't over full. Just a simple suggestion.
    dlt1945
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    Re: Oil accumulates in air cleaner box in Briggs Vanguard 2018/11/04 09:54:05 (permalink)
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    dlt1945
    I have a Vanguard model 354447 with 600 hrs. In a 618 Grasshopper mower that seems to operate properly. My question is the small breather tube from the top of the motor to the air cleaner box exit it’s close to the carb. and puddles some oil in the air cleaner box. Is the carb supposed to suck oil up through the tube or is there some type of defect in the breather system The motor runs strong, Good compression, No exhaust smoke. How much oil should the motor use in a 5 Hr period ?
    any input would be helpful

    Thank you all for your comments, i also want to ad that if i take the air filter cover off and feel the end of the breather tube , I can feel it pulsating properly with absolutely no oil or vapor spitting out. Does the breather tube exit in the air box for emission  for purposes only? Or some other mechanical reason. I was thinking about rerouting the breather tube to a different location where the carburetor would not put suction on the the breather tube. I would think  that a good place for the breather tube to exit would be into one of the valve covers.
                                       thanks any sugestions
    AVB
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    Re: Oil accumulates in air cleaner box in Briggs Vanguard 2018/11/04 12:49:53 (permalink)
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    It both emissions and other related. This breather tube is part of the positive crankcase ventilation (PVC) system. If you reroute the hose to a valve cover you no longer venting the blow-by gases which will lead to blown gaskets and seals as the engine will develop a high crankcase pressure. Same thing happens if you plug the vent line.
     
    The engine must breathe for as much as 40% of the compression gases (unburnt fuel/air mixture) can be involved in the blow-by; although, normally it is between 10 to 20 %.
     
     
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