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    freebird1012's Avatar
    freebird1012 Posts: 6, Reputation: 1
    New Member
    		  
    #1

    Jan 17, 2008, 10:59 AM
    Gas in crankcase
    What causes gas to get into the oil on a 13 commando kohler motor in a john deere?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Jan 17, 2008, 12:18 PM
    My Kohler carb had a bad needle valve that wasn't stoping the gas once the bowl was full. I bowl filled , then gas kept coming so it ran into the cylinder and down to the crank, lost a full gallon of fuel. I would recommend that you start by dropping the bowl and testing the float and valve. Flush you crank case twice with oil after you have drained very bit of the contaminated oil. If you want further instructions let me know otherwise I'll assume you know how to check the valve.
    MOWERMAN2468's Avatar
    MOWERMAN2468 Posts: 3,214, Reputation: 243
    Ultra Member
    		  
    #3

    Jan 17, 2008, 06:22 PM
    You can have a microscopic particle of rust, or other "trash" in the fuel and it can hold open the needle valve. Thus allowing for the flow of fuel into the carbs fuel bowl, flooding it, and going through the intake to the cylinder and finally into the oil. You can remove and clean the carb. And install an inline fuel line shut off valve and help prevent this in the future.
    freewilly32448's Avatar
    freewilly32448 Posts: 7, Reputation: 1
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    #4

    Jan 17, 2008, 06:56 PM
    Comment on ballengerb1's post
    Makes sense
    freewilly32448's Avatar
    freewilly32448 Posts: 7, Reputation: 1
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    #5

    Jan 17, 2008, 06:56 PM
    Comment on MOWERMAN2468's post
    Correct answer, similar to the previous
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