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Farmall & IHC Tractors Discussion Forum
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M overheating

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1951M

12-11-2003 03:06:08




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I have a 1951 M that has been overheating (190 degrees +) when I'm driving downhill, but rapidly returns to normal temp when going back uphill. The coolant level is above the radiator core. Can someone tell me where to look next for the source of the problem? Thanks.




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bbauman

12-11-2003 20:23:19




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 Re: M overheating in reply to 1951M, 12-11-2003 03:06:08  
Sounds similar to driving my Super M home when I bought it. I didn't have an impeller driver for the water pump, might check that yours is turning the water pump if all the other more probable ideas don't work.



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Bill Smith

12-11-2003 12:07:16




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 Re: M overheating in reply to 1951M, 12-11-2003 03:06:08  
Everybody here has got good ideas. Rich and rusty have both stated possible problems, and I believe one or the other, or maybe both is your problem. About the coolant level, you want the water level higher than just looking in and seeing the cores of radiator covered. Your M should have an overflow tube on the neck of the radiator. If I was you I would fill the radiator clear full, to where it goes out the overflow tube, while tractor is cold. Start tractor up and it will seap a little out of the overflow while it is reaching its normal operating temperature. This is the level you want the coolant system to be. Shouldn't be more than an inch or so down from overflow when tractor has cooled back down. Is what happens is the water expands as it gets warmer, and you want the coolant system as full as possible when engine is totally warmed up. You don't want a bunch of air in top of radiator even after engine is warmed up.

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rustyfarmall

12-11-2003 04:40:13




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 Re: M overheating in reply to 1951M, 12-11-2003 03:06:08  
The temperature sender is located to the rear of the engine on an M, if the temperature goes up while going downhill, and goes back down while traveling uphill, it has to be because the coolant is running away from the back of the engine when going downhill, and is no longer covering the temp. sender. I think you need to double check the coolant level, It needs to be up to where you can easily stick your finger in it, not just covering the core.

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Rich Cota

12-11-2003 04:39:44




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 Re: M overheating in reply to 1951M, 12-11-2003 03:06:08  
You more than likely have a 190 degree thermostat in your tractor. Going downhill it dosen't heat up over 190, but going uphill it works harder and goes above 190 causing the thermostat to open.



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Allan

12-11-2003 04:07:35




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 Re: M overheating in reply to 1951M, 12-11-2003 03:06:08  
Hi,

190 degrees is not overheating. 230 to 250 would be cause for concern; at about 300 degrees, she's hot.

Allan



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