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  1. #1
    Silver Member
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    Dec 2011
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    101
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    Winston Salem, NC
    Tractor
    Kubota l39

    Default L39 overheating

    Hi guys,
    I do pretty good with routine maintenance and external repairs but I'm definitely not a mechanic.
    Here's what happened. About a month ago I changed the the coolant in my tractor (drained the old and put new antifreeze in ) and gave it no more thought. Since then the tractor overheats if I run it for any length of time. It seams as if the fluid is not circulating. I'm just about to the point of bringing it into the dealer. My question is this....Is there anything I can do to try to fix it before giving up and letting the experts handle it? (ie. changing the thermostat etc.) Thanks in advance.
    Steve

  2. #2
    Elite Member Don87's Avatar
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    May 2010
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    4,226
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    SW Pa.
    Tractor
    Massey Ferguson GC2400

    Default Re: L39 overheating

    Is the cooling system completely full? Radiator fins clean? Any screens that may be dirty?

    EDIT: Premixed antifreeze, or did you mix it yourself?
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  3. #3
    Veteran Member nybirdman's Avatar
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    Feb 2009
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    north of upstate ny
    Tractor
    Kubota L4240 HSTC,L3000DT

    Default Re: L39 overheating

    Did you run it with the cap off to let the air out?Sounds like its air locked.

  4. #4
    Elite Member Bob77064's Avatar
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    Sep 2011
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    3,859
    Location
    KY @ TN line
    Tractor
    2011 LS R3039

    Default Re: L39 overheating

    Quote Originally Posted by nybirdman View Post
    Did you run it with the cap off to let the air out?Sounds like its air locked.
    That's what it sounds like to me.

  5. #5
    Elite Member Don87's Avatar
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    May 2010
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    SW Pa.
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    Massey Ferguson GC2400

    Default Re: L39 overheating

    Quote Originally Posted by Bob77064 View Post
    That's what it sounds like to me.
    That's what I was thinking right away also. Bad part is, if it wasn't full..........the block or head may now be cracked.

    Pure antifreeze can cause overheating also.
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  6. #6
    Silver Member indianaEPH's Avatar
    Join Date
    Sep 2006
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    229
    Location
    South Central Indiana
    Tractor
    Kubota M59

    Default Re: L39 overheating

    Quote Originally Posted by Don87 View Post
    That's what I was thinking right away also. Bad part is, if it wasn't full..........the block or head may now be cracked.

    Pure antifreeze can cause overheating also.
    If the block or head is cracked then you are going to see oil in the cool an, or coolant in the oil or coolant in the exhaust. That should be easy to tell.

    The first thought I had while ready the post is that it was not premix but was straight antifreeze.

    Can the OP confirm?
    M59 TLB, 66" HD Grapple, Woods 72" BB, Kubota Trencher, Stump Bucket, Taylor 72" Box Blade, 7 ft back blade, woods 7 ft rock rake.

  7. #7
    Elite Member Don87's Avatar
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    Massey Ferguson GC2400

    Default Re: L39 overheating

    no comment from the OP yet, but I'm sure he is checking all the above.
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  8. #8
    Silver Member
    Join Date
    Dec 2011
    Posts
    101
    Location
    Winston Salem, NC
    Tractor
    Kubota l39

    Default Re: L39 overheating

    Man I'm impressed (thankful) with the quick responses. Yes the radiator and overflow bottle is full. The system is clean. I put 100% antifreeze in when changed. No I have not run it with the cap off. I didn't know this is necessary. Will it help to do it now? I have noticed if I run it for a short time and remove the cap it has back pressure in the radiator (not from steam). Should I change the oil to check for water?
    Steve

  9. #9
    Elite Member Don87's Avatar
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    Massey Ferguson GC2400

    Default Re: L39 overheating

    !00 % antifreeze is bad, must be mixed about 50/50 with water. Pull the dipstick and look for milky oil or water droplets on the stick.

    And did you see any traces of oil in your antifreeze with the cap off?
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  10. #10
    Super Member 94BULLITT's Avatar
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    Frederick County, VA
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    Kubota BX2360 & L4240 HSTC

    Default Re: L39 overheating

    There may be a screw somewhere in the head to let the air out. On a car I usually just pull a heater hose and pour antifreeze in the radiator til it runs out the hose.
    Roger

    Kubota BX2360 & Kubota L4240 with paddle shifter, suicide doors and 24's
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