Old? Odd looking thermostat?

blue_tractor_man · Dec 30, 2017

I just pulled the thermostat out of my 64 4 cyl. 4000. I do not think I have ever seen one like it. It has a pivoting valve. The part number is EAF 8575 B. The temp listed on it is 257-162. Is this the 1964 thermostat? I've never replaced it. The temperature has been runnimg erratically for a while. I have a temp gauge that reads in degrees and in the winter it never gets above 160 and in the summer it tends to run hot. I put it in a pan of water over the stove and it opened up around 160, but in heating and cooling it under the tap sometimes it would not close back. It seems that it is sticking. When I replace it what temp should I use? 157 seems cool. Are the newer types of thermostats superior? Thanks for the advice.

Andy Martin · Dec 30, 2017

I've not found new to be superior. Don't know the proper temperature but it may be 160F. I would pickle it in carburetor cleaner and see if it operates consistently then put it back in.

Steve@Advance · Dec 30, 2017

Searching that part number comes up with a thermostat for that model tractor.

Seems I remember seeing some tstats with the pivot type valve, back in the day. Just a different design, I don't see any advantage or disadvantage in it.

It can be replaced with the typical disc type. I would go with the hotter temp, a 172, even a 180 would work.

Bob · Dec 30, 2017

I don't think you told us if it's a gas or a diesel, the current official temperature recommendations for each are shown at the official FIAT site linked below. Should be able to replace it with a generic thermostat from an auto parts store, once you've decided on a temp.

<img src = "http://oi63.tinypic.com/j9m0wx.jpg">

Old-style thermostat with hinged flapper valve
FIAT parts

carvel minne farmer · Dec 30, 2017

good afternoon blue tractor, just a heads up for you, I own and operate a welder repair shop mainly working on engine driven welders, the last 3 years I have to put my new t stats in a pot of water and with a temp guage start warming up the water watching for ones that open at 180 degrees, usually between 2 or 3 will open at 180, a couple will start to open around 190 and the rest won't open with the water boiling!! buying 10 at a time my average has been between 2 and 4 good ones. I discovered this about 4 years ago when one of my good customers had to come back 3 times in one day for a new t stat!! he was not amused. the t stats I buy are stant not cheap knockoffs supposed to be top of the line :roll:

jeffcat · Dec 30, 2017

Arn't most new stuff in the 192? range? I know with polution control and all of that jazz

notjustair · Dec 30, 2017

I used to switch thermostats twice a year when I had a school bus with the Ford 370. I ran 192's in the winter to get it nice and toasty inside but switched those right out in the spring so I didn't cook behind that engine. It was amazing how much more power that engine had when it ran cooler. Engines today don't have any options like that.

blue_tractor_man · Dec 30, 2017

My thermostat looks just like the one pictured. I did a lot of google research and it seems the internet experts agree that 180 is a good balance. Cooler is better for HP, but reduces engine life. Hotter give better fuel economy, but causes you to retard timing, which cuts HP. It seems the older tractors had to use a cooler thermostat because the low pressure cooling systems would boil inside the head. I'm going to install a kettle tested 180 degree thermostat.

jeffcat · Dec 30, 2017

My dad used to drive high school bus for years. I installed an incredible sound system in those busses. Radio, tape, 8 inch speakers. Va va voom. You couldn't get me to drive a school bus on a bet. I hate kids. There are some nice ones and well behaved, but most are stupid animals anymore.

Old? Odd looking thermostat?

blue_tractor_man

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Andy Martin

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Steve@Advance

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Bob

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carvel minne farmer

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jeffcat

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notjustair

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blue_tractor_man

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jeffcat

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