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  1. #1
    New Member
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    Default John Deere M over heating

    I put in new spark plugs wires and a new cap. Drain the anti freez and put new in 50/50 now when it is running the temp gauge runs about 200 and over. The water in the top hose is hot and the botton hose is cold. What did i do wrong, and what should the running temp should be? Before i did this it stayed cool HELP Thanks

  2. #2
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    Default Re: John Deere M over heating

    Maybe gotta get the bubble out that is keeping the coolant from circulating.
    Maybe blockage, but don't know what that would be.

  3. #3
    Platinum Member
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    AC 5020, Gravely Com12, JD M, JD X300R, WH 16 Auto

    Default Re: John Deere M over heating

    The M uses a thermo siphon system, thermo systems don't like heavy anti-freeze mixes. Did you put the previous mix into the system and was it 50/50 if not it could be as simple as the mix being just a bit to heavy. If nothing else drain it back out and put in water, run it and see if it still gets hot, if not then its the anti-freeze mix. Are you sure the gage is accurate?

  4. #4
    Veteran Member Bigfoot62's Avatar
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    Default Re: John Deere M over heating

    I would suspect the thermostat.
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  5. #5
    Super Star Member
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    Default Re: John Deere M over heating

    Does the M have a thermostat?

  6. #6
    Veteran Member
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    North Central Arkansas
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    John Deere 4520,

    Default Re: John Deere M over heating

    I have just finished rebuilding a J.D. "M" engine and the amount of rust sand and crud in engine surprised me also took top off radiator and washed out the cores. agree it is a thermo siphon so no thermostat. and when the heat bulb was removed so must crud in block could not have given accurate temperature

    Is the temp of 200 to high? seems it needs the heat to circulate the cold back into the block.

    ken

  7. #7
    Super Member RickB's Avatar
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    Case 885, Ford 4000

    Default Re: John Deere M over heating

    Quote Originally Posted by beenthere View Post
    Does the M have a thermostat?
    No. No t-stat, no water pump.
    We have too much gun control.
    What we need is more idiot control.

  8. #8
    Super Member RickB's Avatar
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    Case 885, Ford 4000

    Default Re: John Deere M over heating

    Quote Originally Posted by Ken View Post
    I have just finished rebuilding a J.D. "M" engine and the amount of rust sand and crud in engine surprised me also took top off radiator and washed out the cores. agree it is a thermo siphon so no thermostat. and when the heat bulb was removed so must crud in block could not have given accurate temperature

    Is the temp of 200 to high? seems it needs the heat to circulate the cold back into the block.

    ken
    I would not call 200 deg F too hot. So long as it doesn't boil, it's not overheating.
    We have too much gun control.
    What we need is more idiot control.

  9. #9
    Super Member
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    Deere, several

    Default Re: John Deere M over heating

    Only thing you did wrong is to panic when the engine is operating properly.

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