Coolant Temp Sensor diameter
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Senior User
Joined: Dec 2010
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From: Austin, TX
Coolant Temp Sensor diameter
Can someone tell me what diameter the threaded part of the coolant temp sensor is in a 223? Bonus points for the thread pattern.
I'd get in there with calipers, but I never know if what they call it is an actual measurement, or some approximation (like 2x4 lumber is actually 1.5x3.5).
I need to buy a coupler for a different temp sensor.
Thanks.
Larry
I'd get in there with calipers, but I never know if what they call it is an actual measurement, or some approximation (like 2x4 lumber is actually 1.5x3.5).
I need to buy a coupler for a different temp sensor.
Thanks.
Larry
Posting Guru
Joined: May 2013
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From: Manteca, CA
I can't help you with diameter, but I had to buy an adapter kit to adapt to mechanical gauges and local O'Riley's had it in stock...came with a hand full of adapters. Hope this helps a little?
Ford Parts Specialist
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From: Simi Valley, CA
Applications: 1957/62 F100/950 all I-6's & V8's / 1957/59 Ford Passenger Car & Thunderbird all I-6's & V8's.
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Senior User
Joined: Dec 2010
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From: Austin, TX
Thanks guys. I'll check O'Reilly's. If that doesn't work, I may order from here:
McMaster-Carr
McMaster-Carr
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From: Austin, TX
Done. I got the adapters I needed out of the plumbing section of the local hardware store.
FYI, the stock temp sensor, though it's called "1/4", measures about half an inch. The temp gauge and EFI sensors that I installed, though they measure 5/8, are called "3/8". I think I knew that 20 years ago.
FYI, the stock temp sensor, though it's called "1/4", measures about half an inch. The temp gauge and EFI sensors that I installed, though they measure 5/8, are called "3/8". I think I knew that 20 years ago.
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From: tujunga, calif
Me either, thats why I decided to be a rocket scientist rather than a plumber even if they do make more money 
And all the late model stuff with metric fittings 
I'm too old school to learn new tricks.
And all the late model stuff with metric fittings I'm too old school to learn new tricks.
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Joined: Sep 2013
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From: Simi Valley, CA.
FYI NPT refers to National Pipe Thread, where the sealing action is accomplished in the threads. They're tapered and the more you turn them down the tighter you can get the seal. You typically would rely on compound or Teflon tape to assist the seal.
Metric, G threads, or compression fittings rely on seats or seals like O-rings for sealing action.
More useless information I am able to impart.
Metric, G threads, or compression fittings rely on seats or seals like O-rings for sealing action.
More useless information I am able to impart.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Done. I got the adapters I needed out of the plumbing section of the local hardware store.
FYI, the stock temp sensor, though it's called "1/4", measures about half an inch. The temp gauge and EFI sensors that I installed, though they measure 5/8, are called "3/8". I think I knew that 20 years ago.
FYI, the stock temp sensor, though it's called "1/4", measures about half an inch. The temp gauge and EFI sensors that I installed, though they measure 5/8, are called "3/8". I think I knew that 20 years ago.
5th Wheeling
Joined: Mar 2021
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This is all well and good but I am confused and the question has not been answered. Please educate me. I need to replace the temp sender on my 1960 f100. The unit appears to have a 3/8" diameter. The stock sender is "1/4 NPT" which is actually 1/2". So, How does a stock sender with a 1/2" diameter thread fit into a 3/8" hole? My 223/6 engine appears to be stock with a stock hole and stock sender. Does everyone drill out and retap their heads?
FTE Legend
Joined: Jun 2004
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From: Upstate NY
Pipe is measured by the inside diameter. That is how flow can be predicted when designing a plumbing project and it is a standard. You are getting the 1/2" inch measurement by including the thickness of the pipe wall, 1/8" on both sides added to the inside diameter of 1/4". Go to the hardware store and pick up a couple of 1/4" fittings and measure across them, the lights should start to come on! LOL
Fleet Mechanic
Joined: Feb 2019
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From: California High Desert
Pipe is measured by the inside diameter. That is how flow can be predicted when designing a plumbing project and it is a standard. You are getting the 1/2" inch measurement by including the thickness of the pipe wall, 1/8" on both sides added to the inside diameter of 1/4". Go to the hardware store and pick up a couple of 1/4" fittings and measure across them, the lights should start to come on! LOL
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