Coolant leaking from the bottom of the transmission.

Discussion in 'Ask An Owner Operator' started by 1st50billion, Oct 3, 2022.

  1. 1st50billion

    1st50billion Bobtail Member

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    Mar 17, 2022
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    Hey
    I have a 2014 T680 with a 13 sp Paccar transmission. I noticed I was losing coolant but I didn’t see anything on the ground. And then it started pouring out the bottom of the transmission near the bell housing. I also have oil in the reservoir. What’s the connection here. Is it trans oil cooler causing the cross contamination. Any thoughts or suggestions.
    Thanks, CE981645-FE0E-4305-8C32-9854B51D2176.jpeg 86870374-68D1-4791-8EA4-3E59699DB3BE.jpeg
     
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  3. 062

    062 Road Train Member

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    Oct 20, 2013
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    That’s the most likely cause. Hopefully you haven’t ran it too long and wiped out the bearings.
     
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  4. xsetra

    xsetra Road Train Member

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    Aug 21, 2011
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    Do you know if your transmission is coolant or air cooled?
    Just some ideas I would try.
    Follow any hoses from your transmission to see if they connect to your cooling system.
    Did you remove the inspection plug on the side of your transmission to verify coolant inside. There should be a drain plug lower in the transmission you could check for coolant there.
    Did you look above the bell housing for leakage?
     
  5. 1st50billion

    1st50billion Bobtail Member

    8
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    Mar 17, 2022
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    It’s cooled by coolant and I am going to check the inspection plug. There is a puddle of the sludge created by the coolant oil mixture on top of the transmission next to the gearshift.
     
  6. xsetra

    xsetra Road Train Member

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    Use the magnifying glass to search your problem, top right of page.
    Many recommend deleting the coolant and install an air-cooled system.
    First you should drain your transmission. Your own diagnosis is probably correct.
    Good luck
     
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  7. AModelCat

    AModelCat Road Train Member

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    If its not coming out the housing vent and the oil in the transmission is not milky, its not going to be a cooler failure. I'd look and see if you can see coolant leaking from above the transmission or back of the engine.
     
    xsetra Thanks this.
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