Determining threads on coolant plug for tapping

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Command52
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Determining threads on coolant plug for tapping

Postby Command52 » Sat Jul 17, 2021 3:41 pm

Trying to straighten the threads on my coolant drain plug, Am i correct that the thread is 3/8 16 and is this tapered pipe thread or just regular pipe thread Thanks Billy

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Re: Determining threads on coolant plug for tapping

Postby bofahs » Sat Jul 17, 2021 3:59 pm

Pretty sure it's 1/4" NPT.

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Re: Determining threads on coolant plug for tapping

Postby tst » Sat Jul 17, 2021 4:12 pm

3/8" NPT

Command52
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Re: Determining threads on coolant plug for tapping

Postby Command52 » Sat Jul 17, 2021 5:19 pm

Irwin Hanson High Carbon Steel SAE Pipe Taper Tap 3/8 in.-18NPT 1 pc
would this be the correct Tap Thank you Billy

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Re: Determining threads on coolant plug for tapping

Postby Command52 » Sat Jul 17, 2021 5:21 pm

I see it has the word taper in it

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Re: Determining threads on coolant plug for tapping

Postby Glen » Sat Jul 17, 2021 6:12 pm

Hi,
Below is a listing at TM Tractor for a new cooling system drain plug, you can look at the info and pic. :)

http://www.tmtractor.com/new/st/3833fp.htm

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Re: Determining threads on coolant plug for tapping

Postby tmays » Sat Jul 17, 2021 6:21 pm

Command52 wrote:Irwin Hanson High Carbon Steel SAE Pipe Taper Tap 3/8 in.-18NPT 1 pc
would this be the correct Tap Thank you Billy

Yes. Npt is national pipe thread, which has a taper
Thomas

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Re: Determining threads on coolant plug for tapping

Postby SamsFarm » Sun Jul 18, 2021 2:03 pm

There is a thing called a screw pitch gage / thread pitch gauge.

Comes in real handy at times like this!

https://www.starrett.com/category/11150 ... tBy=wp/asc
1968 Cub fast hitch

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Re: Determining threads on coolant plug for tapping

Postby NJ Farmer » Sun Jul 18, 2021 4:59 pm

I would use a brass plug with either pipe dope on it or Teflon tape on the threads….remember you may want to remove that plug years from now or for next generation of Cub owner.

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Re: Determining threads on coolant plug for tapping

Postby Nelson 634 » Mon Jul 19, 2021 2:10 am

NJ Farmer wrote:I would use a brass plug with either pipe dope on it or Teflon tape on the threads…remember you may want to remove that plug years from now or for next generation of Cub owner.

NJ Farmer



Risk of galvanic corrosion. Not something I would do. I would use Copper or Aluminum anti-seize.
Just one persons opinion.
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Re: Determining threads on coolant plug for tapping

Postby Gary Dotson » Mon Jul 19, 2021 7:00 am

A brass plug (or fitting) will work very well with cast iron, I’ve used them for years, I’ve never seen any reaction between the two materials. I’d avoid using aluminum but about anything else will work.

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Re: Determining threads on coolant plug for tapping

Postby Command52 » Mon Jul 19, 2021 7:20 am

Again thank you guys very much I would be lost without you


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