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Model B Thermostat

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Rick ('50 B, NC

10-27-2002 16:28:16

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Does anyone know of a 170 - 180 degree thermostat that will fit a 1950 Model B? I have the factory 130 degree thermostat in it now, but don't have the louvers to regulate the temperature. The tractor always runs too cold except on a 95 degree NC Summer Day under a heavy load. Then, the temperature barely makes it to 170.

Any suggestions?

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Dale(MS)

10-29-2002 18:31:25

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Re: Model B Thermostat in reply to Rick ('50 B, NC), 10-27-2002 16:28:16

Rick, I have never found a thermostat in a "B". Don't need one here in the summer.Have never found one with shutters either. I use a feed bag or cardboard in the cool months. They do seem to run better at 170 degrees. I would think they need to run at least that hot to cook off any condensate which we have alot of.Just be sure your breather cap is in good shape. Dale

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D13

10-29-2002 13:09:21

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Re: Model B Thermostat in reply to Rick ('50 B, NC), 10-27-2002 16:28:16

The radiator in the B's is about 2x what it needs. It will always run cool unless you really load it hard - like plowing a straight line, in clay, for 1/2 hour. Why do you have the urge to heat it up? It might be a little more efficient but the increased heat is harder on the head gasket and such. Mine with no thermostat ran fine all summer long, using a 5' Woods mower. Only issue was keeping the dandelion seeds out of the radiator.

If you really want it to run warm, replace the hood to cowl screws with ones with snaps on them, get a piece of Naugahyde, cut it in half, Velcro the middle back together, then put snaps on it to match the ones on the tractor. That way you can expose as much or little as you want.

In winter we just stuck a piece of carboard over the grille, cutting and bending tabs on the carboard to stick in the grille. It made the beast run at 150 and it was very happy.

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Steve in N.J.

10-28-2002 16:14:07

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Re: Model B Thermostat in reply to Rick ('50 B, NC), 10-27-2002 16:28:16

Rick, When I was restoring my 48' B, I ordered a new thermo from Agco figuring it would look like the big kahoona that was in there along with the giant spring, and it turned out to be a standard looking thermostat that would go in a small block Chevy! Heck, I had them on the shelf! It was in an Agco box and all. If I remember correctly, it was a 150 degree. (could have been a 130)I installed it along with the spring and seems to work fine. I can't see why you couldn't install a 180 stat for a V8 Chevy. Also, if you have the proper radiator cap, you shouldn't have any problems with it blowing the radiator or head gasket. The cap should vent at the pressure it's designed for. If your not sure about the cap, replace it! They're cheap enough...
Good Luck! Hope this helps... Steve B.

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John W.

10-27-2002 17:15:49

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Re: Model B Thermostat in reply to Rick ('50 B, NC), 10-27-2002 16:28:16

Rick; You must remember these tractors are low pressure cooling systems. Installing a 170 or 180 degree thermostat will cause the system pressure to rise well above the 6 to 7 pounds the radiator was designed to work under. Two problems with this come to mind. 1) You will blow out a core or split a tank on the radiator. 2) You could cause a blown head gasket, They were not designed to seal this high of pressure. Something to think about before you raise the cooling system pressure.

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DaveInMI

10-28-2002 10:00:05

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Re: Re: Model B Thermostat in reply to John W., 10-27-2002 17:15:49

I don't understand how it would get over 6 psi if it had a 6 psi pressure cap.

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steve

10-28-2002 16:09:52

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Re: Re: Re: Model B Thermostat in reply to DaveInMI, 10-28-2002 10:00:05

i took mine to AUTO ZONE and matched it up with a 180 degree unit for a car. Installed and it still runs 130. ??? I know it is spring loaded and might leak by a little bit. Alos has a weep hole to keep some recirculation with thermostat closed, but i wonder if the motor really puts out any heat. My radiator is normally cool and i dont heavy load the tractor.

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Bryan Smith

10-30-2002 08:13:16

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Re: Re: Re: Re: Model B Thermostat in reply to steve, 10-28-2002 16:09:52

It's just a cool-running tractor. You can run them without thermostats as mentioned, but I did order one for one of my B's - it was a 150 degree thermostat. The tractor runs 150 to 160, maaaybe 170 on a 95+ degree day. I haven't seen it it 180 at all. My CA is the same way, and I've cultivated with that tractor in 100 degree weather for 10-12 hour days when I was younger.

I think the thermostat is a good idea - get the temp up to try and get at least some of the condensate out of the crankcase. If you don't have that regular oil changes are a must.

And by the way, if the fan stops turning it will overheat in about 3 minutes or less - had that happen when I installed too long a bolt in the cowling by accident - which hit a fan blade and stopped it from turning (had an althernator and a small belt on it at the time and was easy to stop the fan).

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