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52 MH Flathead Cooling System

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Old Jul 28, 2019 | 03:38 PM
  #1  
OLD YELLER 2's Avatar
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52 MH Flathead Cooling System


I was wondering if you guys could help me with some information on the cooling system for my 52 F2 MH. I appears it has two water pumps, is this correct. When I start it and let it idle on head stays cool and the water pipe to the top of the radiator gets warm, the other side the head gets hot and the water pipe stays cool. Should both thermostats be the same? if so do you know the correct ones it needs? Last question- do you know what the paint color is that Rod put on the motor in case I have to replace thermostats? I hate to have to touch the motor since it is near perfect.
Thanks
Dan
 
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Old Jul 28, 2019 | 05:13 PM
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Sounds like you may have a stuck thermostat on the hot head/cold pipe side. You do have two water pumps, and both sides of the cooling system on the flathead are independent of each other. The water does not cross over in the block. It only mixes in the radiator. So it is possible to overheat one side and do engine damage while the other side is operating normal. Please be careful and check out your thermostats right away. 180 'stats should be fine.
 
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Old Jul 28, 2019 | 05:24 PM
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Your truck spent most of its restored life sitting in Rod’s museum. I don’t recall hearing whether he exercised them much. The engine color is 1952 Mercury light green. There are a few rattle can colors that are close, but I’d bet Rod used the Bill Hirsch paint that is the exact match to the original. Stu

https://www.hirschauto.com/mobile/EN...IN%20MER%20LG/
https://www.hirschauto.com/mobile/AE...IN%20MER%20LG/
 
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Old Jul 28, 2019 | 09:06 PM
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NAPA has good thermostats: p/n THM 530060 160 deg
In practice these run in the 180's in my truck, in all weather.
 
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Old Jul 29, 2019 | 07:41 AM
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Great information guys thanks so much. One more question, the temp sending units have a wire from one to another then to the gauge, would the temp gauge be giving you the hotter of the two or is it a combined reading to give you an average?
Thanks
Dan
 
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Old Jul 29, 2019 | 03:17 PM
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The temperature gauge system measures the temperature in one of the heads, the side with the single-terminal sending unit. Power is fed to that sender thru a switch ("excessive heat unit") in the other head, that opens when boiling temperature is reached. As you may have noticed, with no power to the gauge, the needle points to Hot. Similarly when the power to the sender is interrupted by the temperature switch, it sends the gauge to Hot. So it only measures one head, but "monitors" both.

 
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Old Jul 31, 2019 | 08:02 AM
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Great information! Thanks so much for the diagram and taking the time to explain.
Dan
 
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