Anybody know how to clean out a thermosiphon coolant system?
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    Evergreen's Avatar
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    Anybody know how to clean out a thermosiphon coolant system?

    When I pulled the head off of my M, I noticed that there was a bit of calcium buildup in some of the coolant passages.

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    What is a good way to clean this out. Not just the stuff on the surface, but the whole block and radiator. NAPA carries a couple of three step cleaning systems, but I'm not sure if it will work in a cooling system which lacks a water pump.

    '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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    Try CLR. Works pretty good on some bathroom and kitchen faucet screens.

    Sent from my GT-P5113 using Tapatalk

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    Evergreen's Avatar
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    Incase anyone besides me is looking for an answer as well, my local dealership's 'resident old guy' (he started there as a mechanic the same year the twenty series came out) told me that he uses and recommends any quality automotive radiator flush. The key is that flushing process can only be started once the tractor is up to temp enough that the coolant is flowing.
    '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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    89420's Avatar
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    a cheap pre cleaner if you want is vinegar it can sit in there for days. run it to temp several times. if its all apart break out the dremel and you can take the radiator to a radiator shop to be cleaned out. do they still have radiator shops they do around me and hes great
    BigJim55 likes this.
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    Around here,,,
    radiators and oil filters are in the same category,,, replaceable!!



    I would imagine vinegar would be about perfect,,, we must use 5 gallons a year for cleaning,,
    BigJim55 and 89420 like this.

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    Evergreen's Avatar
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    If I hauled it into town and had a professional flush the system, it would still be much cheaper than replacing the radiator. Even the steel reproduction radiators for the M are about $400. For the price of a NOS one, I could just buy another tractor! Besides, the problem is in the engine's cooling passages. I can see into the radiator somewhat and what I can see looks pretty good.

    Is there a vinegar to water ratio... Or do I just fill the thing up with vinegar?
    BigJim55 likes this.
    '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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    89420's Avatar
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    straight vinegar is best might still have to use a brush or scraper of some kind to help get it all off
    BigJim55 likes this.
    1935 jd model D
    65 110 rf
    77 jd 80 cart
    83 420 rear pto, 3 point hitch
    88 332 46"deck s
    89 420 60" deck
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    2)jd 35ev chainsaws (echo)
    jd 50v chainsaw (echo
    jd 60v chainsaw (echo)
    jd 70v chainsaw (echo) sold
    jd 80ev chainsaw (echo)
    jd cs40 chainsaw (efco 940)
    husqvarna 240 chainsaw
    husqvarna 372xp chainsaw
    husqvarna 455 chainsaw
    2)dolmar 117 chainsaws
    dolmar 100 chainsaw

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    MeagerHair's Avatar
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    Another issue with Scale is Thermal Conductivity

    The thermal conductivity of a typical lime/scale deposit measured in Btu/hr/ft2/in/oF ranges from three to seven. As a comparison, the thermal conductivity of copper is 2680 and steel is 460. So the build up makes it much harder for the engine to transfer heat to the coolant.
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    Evergreen's Avatar
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    Quote Originally Posted by MeagerHair View Post
    The thermal conductivity of a typical lime/scale deposit measured in Btu/hr/ft2/in/oF ranges from three to seven. As a comparison, the thermal conductivity of copper is 2680 and steel is 460. So the build up makes it much harder for the engine to transfer heat to the coolant.
    That is the most scientific answer I have ever gotten outside of an actual science classroom. Bravo!

    Before I put the head back on I removed the lower radiator hose and blasted out any loose debris I could with compressed air. Once everything was put back together, I filled, drained, filtered, and refilled the tractor's coolant a few times. At least now it is full of clean coolant. Once I have finished putting my garden in I'll try filling it up with vinegar and see what comes out.
    BigJim55 likes this.
    '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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    BigJim55's Avatar
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    Quote Originally Posted by Evergreen View Post
    That is the most scientific answer I have ever gotten outside of an actual science classroom. Bravo!

    Before I put the head back on I removed the lower radiator hose and blasted out any loose debris I could with compressed air. Once everything was put back together, I filled, drained, filtered, and refilled the tractor's coolant a few times. At least now it is full of clean coolant. Once I have finished putting my garden in I'll try filling it up with vinegar and see what comes out.
    Evergreen--now don't hold me to this, but i think that their's 2 different types of vinegar--one is a little more stronger than the other--and costs way more too. the other summer i was messing around with vinegar and different mixes to make a spray to kill unwanted grass--instead of using my regular mix for trying to protect my need puppy- jeez--can't or couldn't think of the name round-up--getting old. are u using a mixture of water and antifreeze since ur M has no water pump so it doesn't run hot in the summer--my uncle does for the summer-only water in summer-drains and then puts antifreeze for winter--which hi sets for the wintertime in shed covered up with it's own blanket--believe it or not--he's fussy
    89420 likes this.

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