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  1. #1
    New Member docone's Avatar
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    Jun 2014
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    18
    Location
    Wainwright Alberta
    Tractor
    Kubota MX5100HST, B6200D

    Default HELP !!! There is fuel in my crankcase???

    I have a 2012 MX5100HST that is showing fuel in the crankcase. I noticed the issue after the second oil change at 250 hours. prior to that, the crankcase over pressured and spit out the dipstick. I assumed that the cranckcase vent froze off as I was moving snow at the time. The tractor still runs well, no excessive smoke or power loss, so that leads me to look toward the lift pump, or injector pump. Am I correct in this line of thinking??
    I now have 290 hours on the clock, unfortunately, time has run out on my 2 yr warranty period (2yrs/ 2000hrs, whichever occurs first). Further to that, I do occasionally notice more smoke than usual on cold startup, but this clears in a few seconds. (cylinder loading from a leaky injector perhaps?)

    If anyone has any ideas, I welcome your feedback.

  2. #2
    Bronze Member RetiredCarGuy's Avatar
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    May 2014
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    81
    Location
    New York State
    Tractor
    John Deere X575 4X4 and GT235 6 speed, plus an old Allis Chalmers

    Default Re: HELP !!! There is fuel in my crankcase???

    Dripping and leaking injector(s) after shutdown is a real cause.
    USAF SAC 380th BW veteran

    My wife says that I now have too many toys, however I call them mission critical, strategic assets.

  3. #3
    New Member docone's Avatar
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    Jun 2014
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    18
    Location
    Wainwright Alberta
    Tractor
    Kubota MX5100HST, B6200D

    Default Re: HELP !!! There is fuel in my crankcase???

    Thanks, retired car guy!
    I am also a CAR GUY(68 Charger, 69 Mustang Coupe, 52 Chev Sedan Deluxe, 47 GMC Panel). Never too many car toys! Happy Motoring

  4. #4
    Bronze Member RetiredCarGuy's Avatar
    Join Date
    May 2014
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    81
    Location
    New York State
    Tractor
    John Deere X575 4X4 and GT235 6 speed, plus an old Allis Chalmers

    Default Re: HELP !!! There is fuel in my crankcase???

    Hi Docone,

    Thanks! Nice to hear! All are great vehicles, but first fix, or get those injectors fixed to keep diesel fuel out of your tractor crankcase. As it is not good as an engine oil lubricant substitute. It has also been, in the past the number one cause for diesel runaway.

    Then go for a spin in your Charger!
    USAF SAC 380th BW veteran

    My wife says that I now have too many toys, however I call them mission critical, strategic assets.

  5. #5
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    4,834
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: HELP !!! There is fuel in my crankcase???

    Are you sure it's diesel and not hyd oil? If it's diesel in CC I'd suspect inj pump or lift pump causing problem more than injectors.

  6. #6
    Veteran Member banjodunn's Avatar
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    Jun 2008
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    1,229
    Location
    Oz

    Default Re: HELP !!! There is fuel in my crankcase???

    G'day I'm guessing rhat your warranty is not long out it may be worth a call to the dealer to see if they might do something ( Push the very low hrs on the machine to them)



    Jon

  7. #7
    Bronze Member RetiredCarGuy's Avatar
    Join Date
    May 2014
    Posts
    81
    Location
    New York State
    Tractor
    John Deere X575 4X4 and GT235 6 speed, plus an old Allis Chalmers

    Default Re: HELP !!! There is fuel in my crankcase???

    Having the crankcase oil lab tested for all contaminates, may be worthwhile.
    USAF SAC 380th BW veteran

    My wife says that I now have too many toys, however I call them mission critical, strategic assets.

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