C-113 oil drain plug

[KWRB]

When I started my restoration, the oil drain plug was a simple pipe plug. I chucked it. 

I bought a new one, but the threads are too small. I don't know if it was reworked at some point and made larger, or if I bought the wrong size plug.

Does anyone with a 113 or 123 know for sure what their oil drain plug thread size is?

[HydroTek]

Sounds like the original was damaged
and someone tapped the bung to pipe threads 

Should have been straight thread with a copper washer as a seal 

[KWRB]

This makes me sad. I wish they were here to ask. I've told this story before, but my tractor had a major failure when I was a kid. The torque tube broke in half. and had to be repaired in a hurry to plow the snow. Certainly the torque tube was replaced. I'm thinking now, after reading, that the original pan was replaced with a later super C pan, which takes a 7/8" plug as opposed to the original 3/4". The question is, replace the pan with original or keep the replacement. I would like to keep the replacement, as that experience was significant. 

My Grandfather would maybe know if the pan was replaced, but he passed away in May. My dad died in 2005. I think I'll just get the bigger plug.

[Reichow7120]

Do all letter series use the same size plug? Or do the smaller ones run a smaller size than the bigger ones?

[HydroTek]

Welp, didn't remember the older models using a pipe plug
check these two from a Farmall A parts book
Looks like the older one used a 3/4" pipe plug

 

[Matt Kirsch]

If it were tapped to pipe threads, a pipe plug would thread in.

Sounds like it's still tapped to straight threads, and either the old plug was misidentified, or cross-threaded in. No offense but I'm stymied as to why you'd chuck the old plug, even if you didn't plan on using it.

[farmalldr]

I have a 47 A, 2-49 C's, and 2-47-H's, they all have 3/4 npt plugs.  My SMTA has a straight thread with a washer.  My opinion is the 3/4 pipe was standard then and maybe changed later on at some point.    Dennis

[KWRB]

14 hours ago, KWRB said:

When I started my restoration, the oil drain plug was a simple pipe plug. I chucked it. 

I bought a new one, but the threads are too small. I don't know if it was reworked at some point and made larger, or if I bought the wrong size plug.

Does anyone with a 113 or 123 know for sure what their oil drain plug thread size is?

 

5 hours ago, Matt Kirsch said:

If it were tapped to pipe threads, a pipe plug would thread in.

Sounds like it's still tapped to straight threads, and either the old plug was misidentified, or cross-threaded in. No offense but I'm stymied as to why you'd chuck the old plug, even if you didn't plan on using it.

So, you mean "no?"

[Matt Kirsch]

3 hours ago, KWRB said:

 

So, you mean "no?"

My comment was in response to HydroTek's comment of "someone tapped the bung to pipe threads." Apparently it did not quote properly. 

If what you took out was an actual pipe plug, God only knows what's been done to your oil pan and the correct information is useless anyway. 

Sorrr-eee... I did not realize trying to be helpful would be offensive to you. No need to respond. I will not see it.

[bcsmta]

Have 3 B and 1948 C all have pipe plug drain on pans have a 1954 S/C and SMT they have the fine thread plug with brass washer