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OT: Lawn more burning oil question

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odie91
odie91 Posts: 541
in Off Topic
John Deere L100 riding mower.   Burns oil and has to be refilled after every mowing.   But there is NO smoke coming out of the engine.   When the oil cap is opened though, I do see smoke coming out of it.

This is not a head gasket issue right?  If so, I would see smoke coming out of the engine?

Worn piston rings?  Would or wouldn't there be smoke if so?

Help me troubleshoot this!


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  • 1voyager
    1voyager Posts: 1,157
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    What viscosity are you using?
    Large Egg, PGS A40 gasser.
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  • poster
    poster Posts: 1,172
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    Do you see oil on the outside of the engine anywhere, or on the ground. Refilling after every mow, is a lot of oil.
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  • odie91
    odie91 Posts: 541
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    No oil on ground or engine but I'll look closer.     10W-30.  
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  • ColtsFan
    ColtsFan Posts: 6,340
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    I'm going to guess it's coming from the crankshaft seal where the main drive pulley is. Probably being flung underneath the mower 
    ~ John - https://www.instagram.com/hoosier_egger
    XL BGE, LG BGE, KJ Jr, PK Original, Ardore Pizza Oven, King Disc 
    Bloomington, IN - Hoo Hoo Hoo Hoosiers!

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  • JethroBodeen
    JethroBodeen Posts: 524
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    What's the spark plug look like?
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  • rifrench
    rifrench Posts: 469
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    Firstly, how many hours on the engine?   Which engine is it?  Has the oil been changed according to the owner's manual, preferably more often? 
    And look at the exterior of the engine all over, under & etc.

    Then we can talk about other problems. Air cooled engines typically use more oil during hot weather, and when the oil viscosity is too thin for conditions
    .

     1 LBGE, 1 SBGE, 1 KBQ and a 26" Blackstone near Blackstone, Virginia
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  • nolaegghead
    nolaegghead Posts: 42,102
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    I would do a compression and leak test if you don't find any external leaks.  Oil usually enters the combustion chamber through the valves, rings or head gasket.  Does it smoke when you start it?
    ______________________________________________
    I love lamp..
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  • bigguy136
    bigguy136 Posts: 1,362
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    I agree with checking the spark plug. If the white porcelain is brown, you are burning oil. If not, you are leaking oil.
    Colored (red, blue) porcelain is dye from fuel and nothing to worry about. When you know if you are burning or leaking, you can look closer in the right area.

    Big Lake, Minnesota

    2X Large BGE, 1 Mini Max, Stokers, Adjustable Rig

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  • frazzdaddy
    frazzdaddy Posts: 2,617
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    odie91 said:
    John Deere L100 riding mower.   Burns oil and has to be refilled after every mowing.   But there is NO smoke coming out of the engine.   When the oil cap is opened though, I do see smoke coming out of it.

    This is not a head gasket issue right?  If so, I would see smoke coming out of the engine?

    Worn piston rings?  Would or wouldn't there be smoke if so?

    Help me troubleshoot this!


    how long is a" mowing"? how much oil? With no smoke I would look for a leak under the engine.
    Xl bge ,LG bge, two 4' crusher cone fire pits. Weber Genisis gasser and 
    Two rusty Weber kettles. 

    Two Rivers Farm
    Moncure N.C.
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