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Temp sending unit question.
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willard77
Posted 2021-05-28 6:59 AM (#612288)
Subject: Temp sending unit question.


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I have my 58 Plymouth running now and when the engine gets up to temp, the guage pegs out to hot inside the car. I have checked the temp of the engine with a infered laser thermometer at several locations on the engine and the highest temp I can find is 197 degrees. That temp was taken on the thermostat housing. The bottom radiator hose is around 155 degrees. The engine I installed is a 318 poly but it's a 1966 model and the temp sending unit is alot smaller than the original one. My question is, are there a difference in resistance between the two sending units or were they all pretty much standard? I can't use the original sending unit because it is larger than the one that is currently in the car. Thanks in advance for any help.
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1960fury
Posted 2021-05-28 9:13 AM (#612289 - in reply to #612288)
Subject: Re: Temp sending unit question.



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https://www.ebay.com/itm/373506399377?hash=item56f6b75c91:g:86IAAOSw...
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wizard
Posted 2021-05-28 10:45 AM (#612292 - in reply to #612288)
Subject: Re: Temp sending unit question.



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Yes.there's a difference. Most of the new replacements wont work.
Measure the ohms on the original probe, first in ambient temperature and then by putting it in boiling water.
Do the same with the new one and see the difference. If you're Lucky You could add a resistance for the proper reading.
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Powerflite
Posted 2021-05-28 10:59 AM (#612293 - in reply to #612288)
Subject: Re: Temp sending unit question.



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But 197 is still too hot, so you need to address that. If your timing is too retarded, it will make your engine run hot.
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willard77
Posted 2021-05-28 5:51 PM (#612299 - in reply to #612288)
Subject: Re: Temp sending unit question.


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Timing is set at 15 degrees advanced and has a 180 degree thermostat. 1960fury, I have npt taps from 1/8 inch up to 3/4 inch but thanks for the link. I really didn't want to drill and tap the intake but I guess I could. I was hoping to be able to figure out what the ohms of the factory on and find one to match and fit in my intake. I'm gonna try to measure the original one and see what I come up with. Thanks for the help guys!
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1960fury
Posted 2021-05-28 7:00 PM (#612301 - in reply to #612288)
Subject: Re: Temp sending unit question.



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Many years ago installed an aluminum water pump hsg in my 60 Fury and the only temp units fit from newer Mopars, so I ignorantly installed a newer 1/8" NPT sender and it worked perfectly for almost 30 years, meanwhile I tried that with other FLs and the newer units didn't work very well, but I do not remember how I tackled that. Few years ago the one in my 60 Fury failed, so I tapped the hsg to 1/4" NPT and run the OE temp sender that came with the car, without problems (of course).
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58coupe
Posted 2021-05-29 12:13 PM (#612311 - in reply to #612288)
Subject: Re: Temp sending unit question.



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I had the same problem years ago, installed a 60 361 in my 57 Fury and the temp gauge was showing very hot even though the engine wasn't. switched the senders and problem solved. Both senders were the same size but different resistance.
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sermey
Posted 2021-05-30 5:20 AM (#612325 - in reply to #612288)
Subject: RE: Temp sending unit question.


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Here another view of this theme.  - SERGE -  

Viewing a thread - Defective Water Temperature Sensor (2010)

http://www.forwardlook.net/forums/forums/thread-view.asp?tid=29524&posts=22&start=1



Edited by sermey 2021-05-30 5:28 AM
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Mikeb
Posted 2022-02-06 7:59 PM (#619134 - in reply to #612288)
Subject: Re: Temp sending unit question.


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Most senders are for a system using a voltage regulator that reduces the voltage to about 3-4 volts. The 57-58 Plymouths like my 59 Chrysler do not use a regulator so they run on 12 volts. you need the correct sender. It took me a while by Andy Burnbaum finally got me the correct one.
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