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05-01-2019, 07:05 PM | #1 |
Senior Member
Join Date: Dec 2018
Posts: 128
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Thermostat orientation
Is this the correct orientation for a thermostat. I'm 98 percent sure it is, but than there is the 2 percent that worries me. The photo below shows the thermostat orientation.
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05-01-2019, 08:30 PM | #2 |
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Join Date: May 2010
Location: Wisconsin, USA
Posts: 8,988
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Re: Thermostat orientation
You have this installed properly.
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05-01-2019, 08:42 PM | #3 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: Thermostat orientation
Now you need to have a way to retain it so it doesn't turn inside the hose.
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05-01-2019, 09:00 PM | #4 |
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Join Date: Dec 2018
Posts: 128
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Re: Thermostat orientation
Yah, I had one flip one me on my first test run. Driving on a short test drive, while constantly watching the temperature gauge, it went from 180 to 145 in a matter of seconds. I knew something was wrong. I drained the radiator an the thermostat was rotated. I have since put a third hose clamp just above the heads water outlets. I don't know of any other way of retaining the thermostat.
When this happens, the cooling capacity transfers to the side of the motor that the thermostat rotated, path of least resistance. In my opinion all flatheads should have temperature sending unit installed on both sides of the motor. Last edited by RandyMettler; 05-01-2019 at 09:14 PM. |
05-01-2019, 10:18 PM | #5 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: Thermostat orientation
There are several methods to retain them and a number of threads on the topics. Examples are fine wires that fit between the head and the hose, or use a metal sleeve inside the hose.
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05-02-2019, 01:06 PM | #6 |
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Join Date: Jun 2014
Location: Williamsburg, VA
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Re: Thermostat orientation
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I saw the temperature go to hot (the top mark on the gauge is about 200 degrees) first, and then drop to the thermostat temp. With the water flow blocked by the closed thermostat, the water at the sensor had to get to 200 before the water temperature up in the neck of the head gets hot enough to open the thermostat. I drilled two 5/32" holes hear the edge of each thermostat to let some flow past the bi-metal thermostat mechanism. Now the temp comes up to the thermostat temp without any overshoot. |
05-06-2019, 12:08 PM | #7 |
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Join Date: Oct 2015
Location: Bonita, CA
Posts: 1,374
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Re: Thermostat orientation
I use a little JB Weld on the flange. Works like a champ and heat resistant and also keeps water from bypassing the thermostat.
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05-07-2019, 01:49 AM | #8 |
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Join Date: Feb 2019
Location: Illinois
Posts: 48
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Re: Thermostat orientation
I'm getting ready to change the upper radiator hoses on my 37 and was told the shape of the hose will hold the thermostat in place. I'm I being misinformed?
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05-07-2019, 08:45 AM | #9 |
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Join Date: May 2010
Location: Louisiana
Posts: 866
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Re: Thermostat orientation
Only original hoses had the rubber bulge I.D. that would hold the thermostat in place The re- production hoses do not have that and will not retain the thermostat. You must use an alternate method such as extra clamp or wire. I prefer the wire or soldered shim tabs on the thermostat rather than the clamps because they are too obvious from stock.
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05-07-2019, 08:54 AM | #10 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: Thermostat orientation
You are being misinformed. The original thermostats were barrel shaped and located near the radiator inlets. Modern thermostats need to be retained by some method.
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05-07-2019, 09:52 AM | #11 |
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Join Date: May 2010
Location: Louisiana
Posts: 866
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Re: Thermostat orientation
Years ago I had seen some old original '42-'48 style hoses that had a noticeable bulge inside the lower end to hold the thermostat. At one time Drake had a picture of the same thing in his catalog.
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