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John Deere Tractors Discussion Forum

JD D Overheating

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B Duncan

11-06-2007 03:57:21

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Hi Yall,

I have a 39 D that has just out of the blue developed an overheating problem. I started the tractor up the other day and drove it around just a little bit and noticed that the temp gage was moving faster than usuall. The tractor has a mix of antifreeze and water. I drove it five miles back in the summer at +90 tems and the gague never went past 160. It got to 190 and i slowed the engine down. it crept to 220 and i shut it off. The shutters are open and there is water in the radiator. When it cooled down i opened the drain in the block and coolant came out. After i shut if off i noticed that the block was hot but the radiator wasnt. I am gonna reverse flush the block by hooking a hose to the valve i have on the bottom and see if there is a blockage. Sorry to be long winded but i would greatly apprecieate any advice. Thanks again.

Brad

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B Duncan

11-06-2007 10:03:34

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Re: JD D Overheating in reply to B Duncan, 11-06-2007 03:57:21

Thanks guys. I will give that a shot when i get home this afternoon.

Thanks
again

Brad

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P Browning

11-06-2007 06:25:58

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Re: JD D Overheating in reply to B Duncan, 11-06-2007 03:57:21

B Duncan -- Here is an excerpt from the John Deere Model H Restoration Guide which will shed some light on the phenomenon many call antifreeze block. (PatB)
----- ----- ----- -
ANTIFREEZE -- When adding antifreeze like the conventional green coolant such as NAPA brand prepared for NAPA by the makers of PEAK, strive to avoid having all of the antifreeze in the bottom of the cooling system. Don't just pour the antifreeze in first! Mix! Mixing antifreeze with water before pouring the mixture into the radiator will prevent development of an "antifreeze block" in your cooling system. In your JD "H" tractor, heated water will rise over unheated water because heated water has a lower "specific gravity," i.e., it is not as dense, thus lighter in weight. This "automatic circulation" does not happen until water in the lower part of the coolant jacket (engine) is heated to achieve this "less dense" state so as to rise. The specific gravity of NAPA antifreeze is 1.12. That is 12% heavier than pure water! Its density is not known to change much with temperature, and it will NEVER become less dense than pure water. So, if the lower half of your coolant jacket is filled with pure antifreeze, it just WILL NOT rise over water, meaning that you may have NO circulation! The temperature gauge reads HOT, yet the upper radiator tank is COLD. If this happens, drain, mix and then reinstall the mixture into the tractor. Caution: Never drain coolant from a super-heated engine; just shut it down and let it cool. ++++

Restoration Site, JD H

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GeorgiaHayFarmer

11-06-2007 05:38:21

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Re: JD D Overheating in reply to B Duncan, 11-06-2007 03:57:21

Brad,

Sounds to me like you need to pre-mix the water and anti-freeze before you put it in the radiator. Have you added water or antifreeze before it overheated? The tractor will not mix water and antifreeze itself and will show the same symptoms you describe. Other than a blockage, this is what I would look for. Drain it, flush it, then premix in a bucket and try it again and see what happens.

Scott

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