The Ford Barn

Lawson Cox · 03-31-2023, 08:39 PM

Long story shortened. I have a NOS brass plug, for plugging heater hose connection outlet in 60HP display engine. I have 7 heads, 2 are cast iron. I have tried to fit the plug to each head. I can only get it to go into one head, which is cast iron. I have several NOS "iron" plugs, and cannot get any of those to work either, I have run a tap into the holes on the display engine, with no better results. I would sort of like to plug these holes for appearance sake. I know threads are correct in head and on plugs.

What am I doing wrong? Suggestions.

1952henry · 03-31-2023, 08:48 PM

Not to insult you in the least, you are using pipe tap? Or is this not pipe thread?

Lawson Cox · 03-31-2023, 09:13 PM

Quote:

Originally Posted by 1952henry

Not to insult you in the least, you are using pipe tap? Or is this not pipe thread?

It is NOT a pipe thread. Regardless, thread in head and on plug is the same. Just having trouble getting the plug started in the head.

Brian · 03-31-2023, 10:11 PM

What you're doing wrong is using the wrong plugs...5/8 UNF has 18 threads per inch, 3/8 National pipe thread has 18 TPI too. So, I'm assuming that the tap you are using is 5/8 UNF and your plugs are indeed pipe thread.

Tim Ayers · 04-01-2023, 01:27 PM

Quote:

Originally Posted by Brian

What you're doing wrong is using the wrong plugs...5/8 UNF has 18 threads per inch, 3/8 National pipe thread has 18 TPI too. So, I'm assuming that the tap you are using is 5/8 UNF and your plugs are indeed pipe thread.

I believe Brian is right. Those holes in the head should be 3/8” pipe thread

51504bat · 04-01-2023, 03:13 PM

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Can't say on a V8-60 but on an 8ba they are definitely 3/8 pipe.

Kube · 04-01-2023, 06:35 PM

Quote:

Originally Posted by 51504bat

Can't say on a V8-60 but on an 8ba they are definitely 3/8 pipe.

60 is pipe thread.

03-31-2023, 08:39 PM	#1
Lawson Cox Senior Member Join Date: May 2010 Location: Above the gnat line in Georgia Posts: 7,009	Heater hose connection in head. Brass plug fitment Long story shortened. I have a NOS brass plug, for plugging heater hose connection outlet in 60HP display engine. I have 7 heads, 2 are cast iron. I have tried to fit the plug to each head. I can only get it to go into one head, which is cast iron. I have several NOS "iron" plugs, and cannot get any of those to work either, I have run a tap into the holes on the display engine, with no better results. I would sort of like to plug these holes for appearance sake. I know threads are correct in head and on plugs. What am I doing wrong? Suggestions. __________________ Life is like a roll of toilet paper. The closer to the end, the faster it goes. It is better to be seen, than viewed. "We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm".

03-31-2023, 08:48 PM	#2
1952henry Senior Member Join Date: May 2010 Location: North Dakota Posts: 1,621	Re: Heater hose connection in head. Brass plug fitment Not to insult you in the least, you are using pipe tap? Or is this not pipe thread? __________________ I dig coal, which provides motivation for EVs. Last edited by 1952henry; 03-31-2023 at 09:07 PM.

03-31-2023, 10:11 PM	#4
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,834	Re: Heater hose connection in head. Brass plug fitment What you're doing wrong is using the wrong plugs...5/8 UNF has 18 threads per inch, 3/8 National pipe thread has 18 TPI too. So, I'm assuming that the tap you are using is 5/8 UNF and your plugs are indeed pipe thread. __________________ Unfortunately, two half wits don't make a whole wit!

04-01-2023, 03:13 PM	#6
51504bat Senior Member Join Date: Sep 2013 Location: SoCal-Redlands Posts: 3,024	Re: Heater hose connection in head. Brass plug fitment Sponsored Links (Register now to hide all advertisements) Can't say on a V8-60 but on an 8ba they are definitely 3/8 pipe. __________________ Making the simple complicated for over 30 years.