Temp sensor port thread chaser

[drfromnc]

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]

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

 

[aussie merc]

try 3/8 npt

 

[flatjack9]

3/8 npt

 

[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.

 

[V8COOPMAN]

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]

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

 

[drfromnc]

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

 

[deuce lover]

Here is one of many on EBAY or your local Ace Hdwe.
https://www.ebay.com/itm/313420888015?epid=28011374431&hash=item48f95737cf:g:-YEAAOSwvypgK1VR

 

[cdan34]

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

 

[51504bat]

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-piece-pipe-tap-die-set-91395.html

 

[drfromnc]

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

 

[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 ***** for the water jackets. Should I plug them or use pet *****? what size are those threads normally?

 

[Brian]

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]

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 ***** for the water jackets. Should I plug them or use pet *****? 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]

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]

thanks again gentlemen.

 

[flatjack9]

I would use drain *****.

 

[Kube]

I would use drain *****.

Me too. Ford installed drain ***** in the block.

 

[drfromnc]

This Drain ****?

https://thirdgenauto.com/product/1933-48-ford-replacement-cooling-system-brass-drain-****/