John Deere M Return Coolant Temp
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Thread: John Deere M Return Coolant Temp

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    John Deere M Return Coolant Temp

    Does anyone know what a good coolant return temp should be for a JD M? I know operating temp is around 190 and cooling is by thermosiphon.

    Thanks

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    I'm not sure what the return temp should be, but if you are only at 190* operating temp, that is a very cool running M.
    '50 Model M w/electronic ignition, 12v conversion, and a 3pt conversion plus a homemade snowplow, a Deere Model 51 trailer plow, a Woods RM59 finish mower, a Bark Buster splitter, and a few other toys.
    '69 Sears Suburban 14 48" deck and 42" back blade, an estate rake, and a sweeper.
    '07 F250 XL Powerstroke, crew cab, short box, 4x4.
    '85 F150... I finally sold my very first truck after racking up over half-a-million miles on the original drivetrain.

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    That temp was from just idling and short run around the yard. Pulling the 2 bottom M2 plow it jumped to about 220. Water was not boiling when we removed the cap.

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