The Ford Barn

drfromnc · 01-01-2022, 08:16 PM

Been searching the inter webs for a thread chaser or thread restorer for 59a temp sensor ports on the heads. Can’t seem to find one in 3/8 in-18 thread pitch. Anyone have any leads on where i can buy one?

fordyford · 01-01-2022, 08:24 PM

Try a pipe thread. Be careful not to go too deep, they are tapered.

aussie merc · 01-01-2022, 08:43 PM

try 3/8 npt

flatjack9 · 01-01-2022, 11:38 PM

3/8 npt

Brian · 01-02-2022, 12:26 AM

Disclaimer; I am not 100% intimate with late model flatheads....
However...are you sure its NPT [National Pipe Taper]? I thought it was NPP [National Pipe parallel]. I thought the female thread [in the head] was parallel, and the male thread [the temp probe] is tapered, so that the more you tighten it up, the tighter it gets, thus sealing.

V8COOPMAN · 01-02-2022, 03:30 AM

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Quote:

Originally Posted by Brian

Disclaimer; I am not 100% intimate with late model flatheads....
However...are you sure its NPT [National Pipe Taper]? I thought it was NPP [National Pipe parallel]. I thought the female thread [in the head] was parallel, and the male thread [the temp probe] is tapered, so that the more you tighten it up, the tighter it gets, thus sealing.

Believe me, the MALE tapered thread WILL get tighter, the deeper it goes into a FEMALE tapered thread. DD

deuce lover · 01-02-2022, 04:05 AM

The port in the head is NPT.National Pipe Taper.Brian was correct.

drfromnc · 01-02-2022, 10:10 AM

Thanks for all the info but where do I get one?

deuce lover · 01-02-2022, 10:13 AM

Here is one of many on EBAY or your local Ace Hdwe.
https://www.ebay.com/itm/31342088801...EAAOSwvypgK1VR

cdan34 · 01-02-2022, 10:25 AM

Make sure the tap is made of HSS (High Speed Steel) not HC (High Carbon)

51504bat · 01-02-2022, 10:52 AM

When I needed one for my 8ba I bought a set at Harbor Freight for cheap. May not be the highest quality but chased the threads on the head no problem.
https://www.harborfreight.com/6-piec...set-91395.html

drfromnc · 01-02-2022, 11:12 AM

got it. thanks gentlemen. added to my list of things to buy.

drfromnc · 01-02-2022, 11:23 AM

so next question on engine ports, on each side of the block behind water pumps there are threaded ports for either threaded plug (like on my other bare block) or drain pet cocks for the water jackets. Should I plug them or use pet cocks? what size are those threads normally?

Brian · 01-02-2022, 11:27 AM

Believe me, the MALE tapered thread WILL get tighter, the deeper it goes into a FEMALE tapered thread. DD

Yes, but if you tap the tapered female thread TOO deep, the hex on the male nipple will bottom out, preventing the threads from forming a seal

marko39 · 01-02-2022, 12:12 PM

Quote:

Originally Posted by drfromnc

so next question on engine ports, on each side of the block behind water pumps there are threaded ports for either threaded plug (like on my other bare block) or drain pet cocks for the water jackets. Should I plug them or use pet cocks? what size are those threads normally?

I would go with plugs, less chance of leaks. Make sure to use neversieze so you can get them out. Not sure on the size but thinking 1/4 npt.

Tim Ayers · 01-02-2022, 12:17 PM

Quote:

Originally Posted by marko39

I would go with plugs, less chance of leaks. Make sure to use neversieze so you can get them out. Not sure on the size but thinking 1/4 npt.

Yes, 1/4" NPT on those.

drfromnc · 01-02-2022, 12:26 PM

thanks again gentlemen.

flatjack9 · 01-02-2022, 01:00 PM

I would use drain cocks.

Kube · 01-02-2022, 01:29 PM

Quote:

Originally Posted by flatjack9

I would use drain cocks.

Me too. Ford installed drain cocks in the block.

drfromnc · 01-02-2022, 02:56 PM

This Drain cock?

https://thirdgenauto.com/product/193...ss-drain-cock/

01-01-2022, 08:16 PM	#1
drfromnc Senior Member Join Date: Oct 2017 Location: Smithfield, NC Posts: 259	Temp sensor port thread chaser Been searching the inter webs for a thread chaser or thread restorer for 59a temp sensor ports on the heads. Can’t seem to find one in 3/8 in-18 thread pitch. Anyone have any leads on where i can buy one?

01-01-2022, 08:24 PM	#2
fordyford Senior Member Join Date: May 2010 Posts: 191	Re: Temp sensor port thread chaser Try a pipe thread. Be careful not to go too deep, they are tapered.

01-01-2022, 08:43 PM	#3
aussie merc Senior Member Join Date: Sep 2016 Location: sydney australia Posts: 1,030	Re: Temp sensor port thread chaser try 3/8 npt

01-01-2022, 11:38 PM	#4
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Temp sensor port thread chaser 3/8 npt

01-02-2022, 12:26 AM	#5
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,829	Re: Temp sensor port thread chaser Disclaimer; I am not 100% intimate with late model flatheads.... However...are you sure its NPT [National Pipe Taper]? I thought it was NPP [National Pipe parallel]. I thought the female thread [in the head] was parallel, and the male thread [the temp probe] is tapered, so that the more you tighten it up, the tighter it gets, thus sealing. __________________ Unfortunately, two half wits don't make a whole wit!

01-02-2022, 04:05 AM	#7
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,301	Re: Temp sensor port thread chaser The port in the head is NPT.National Pipe Taper.Brian was correct. Last edited by deuce lover; 01-02-2022 at 10:14 AM.

01-02-2022, 10:10 AM	#8
drfromnc Senior Member Join Date: Oct 2017 Location: Smithfield, NC Posts: 259	Re: Temp sensor port thread chaser Thanks for all the info but where do I get one?

01-02-2022, 10:13 AM	#9
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,301	Re: Temp sensor port thread chaser Here is one of many on EBAY or your local Ace Hdwe. https://www.ebay.com/itm/31342088801...EAAOSwvypgK1VR

01-02-2022, 10:25 AM	#10
cdan34 Senior Member Join Date: May 2010 Location: Mill Valley, Calif. Posts: 120	Re: Temp sensor port thread chaser Make sure the tap is made of HSS (High Speed Steel) not HC (High Carbon)

01-02-2022, 11:12 AM	#12
drfromnc Senior Member Join Date: Oct 2017 Location: Smithfield, NC Posts: 259	Re: Temp sensor port thread chaser got it. thanks gentlemen. added to my list of things to buy.

01-02-2022, 11:23 AM	#13
drfromnc Senior Member Join Date: Oct 2017 Location: Smithfield, NC Posts: 259	Re: Temp sensor port thread chaser so next question on engine ports, on each side of the block behind water pumps there are threaded ports for either threaded plug (like on my other bare block) or drain pet cocks for the water jackets. Should I plug them or use pet cocks? what size are those threads normally?

01-02-2022, 11:27 AM	#14
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,829	Re: Temp sensor port thread chaser Believe me, the MALE tapered thread WILL get tighter, the deeper it goes into a FEMALE tapered thread. DD Yes, but if you tap the tapered female thread TOO deep, the hex on the male nipple will bottom out, preventing the threads from forming a seal __________________ Unfortunately, two half wits don't make a whole wit!

01-02-2022, 12:26 PM	#17
drfromnc Senior Member Join Date: Oct 2017 Location: Smithfield, NC Posts: 259	Re: Temp sensor port thread chaser thanks again gentlemen.

01-02-2022, 01:00 PM	#18
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Temp sensor port thread chaser I would use drain cocks.

01-02-2022, 02:56 PM	#20
drfromnc Senior Member Join Date: Oct 2017 Location: Smithfield, NC Posts: 259	Re: Temp sensor port thread chaser This Drain cock? https://thirdgenauto.com/product/193...ss-drain-cock/