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Old 10-16-2020, 09:44 AM   #1
corvette8n
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Default Whatís a quick test for temp sending unit?

I pulled a single screw temperature sending unit from a junk head, itís stamped KS on the side. Whatís the easiest way to test it? If itís good Iíll put it in my spare parts stash.
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Old 10-16-2020, 10:13 AM   #2
HD
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Default Re: Whatís a quick test for temp sending unit?

read an old Motors manual, these are King Seeley units, it tells how to test them, step by step
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Old 10-16-2020, 11:40 AM   #3
19Fordy
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Default Re: Whatís a quick test for temp sending unit?

corvette: Peruse these threads.

Plus, I read a thread on fordbarn a while back on someone who actually figured out a way to repair these units on his own.

https://www.fordbarn.com/forum/searc...rchid=18281647

Also, read through these threads.
https://www.fordbarn.com/forum/searc...rchid=18281764
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Old 10-16-2020, 11:51 AM   #4
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Default Re: Whatís a quick test for temp sending unit?

I fixed one a while back. Look at this thread : https://www.fordbarn.com/forum/showthread.php?t=226078.
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Old 10-16-2020, 02:05 PM   #5
drolston
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Default Re: Whatís a quick test for temp sending unit?

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Originally Posted by corvette8n View Post
I pulled a single screw temperature sending unit from a junk head, itís stamped KS on the side. Whatís the easiest way to test it? If itís good Iíll put it in my spare parts stash.
Swap it into a car with a working gauge and see if it registers the same as the working sender.

Can be done without losing more than a few tablespoons of coolant as you swap senders.
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Old 10-16-2020, 02:21 PM   #6
corvette8n
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Default Re: Whatís a quick test for temp sending unit?

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All good suggestions, I do have a 1953 Motors repair manual. Thanks
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Old 10-16-2020, 03:48 PM   #7
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Default Re: Whatís a quick test for temp sending unit?

One way to test is with an Ohm meter. The reading between the screw and the the body of the sender unit is in the area of 12-14 ohms. Readings in this range usually indicate a good sender unit.

Hope this helps,

Tom
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Old 10-16-2020, 04:38 PM   #8
JSeery
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Default Re: Whatís a quick test for temp sending unit?

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One way to test is with an Ohm meter. The reading between the screw and the the body of the sender unit is in the area of 12-14 ohms. Readings in this range usually indicate a good sender unit.

Hope this helps,

Tom
Not sure what that would check other than the calibration resistance. Guess it would also tell you the points were closed. The issues if not working is normally the points needing cleaned. Tubmans thread covers that.
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Old 10-16-2020, 06:04 PM   #9
rotorwrench
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Default Re: Whatís a quick test for temp sending unit?

I use a hot plate with a pan of turbine oil to heat the sender unit. (turbine oil won't burn and it won't boil at 230 degrees but water will get you in the ball park). Some jumper leads and an old Ford/KS gauge that I know still works along with a 6-volt power source will do the job. I use an infrared thermometer to check the temps. A person can do it right next to the car if they have long enough jumper leads.
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