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Old 02-10-2014, 03:00 PM   #1
mantta
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Question Engine Oil Drain Plug

Can anyone tell me what thread size is on the oil drain plug? I just drained the oil and went to put the plug back in and it would not tighten so, I took it back out and the threads on the plug were almost all gone! (repo) The threads in the pan look okay and I thought I would chase them with a tap first and install a new plug. My thread pitch gauge says 24 TPI and I am guessing it is 3/4" X 24 TPI. Hope this can be verified. Thanks!
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Old 02-10-2014, 03:15 PM   #2
Patrick L.
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Default Re: Engine Oil Drain Plug

New 3/4"X24 drain plugs are available at any of the vendors for a few bucks.
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Old 02-10-2014, 03:56 PM   #3
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Default Re: Engine Oil Drain Plug

I have ordered a new drain plug. My question is what is the thread size so I can chase the threads in the pan with a tap.
Thanks
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Old 02-10-2014, 03:57 PM   #4
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Default Re: Engine Oil Drain Plug

This is what I use:

Magnetic Oil Drain Plug:
Same as the regular oil drain plug except it has a magnet to grab any foreign metal objects floating in the oil that can cause damage. U.S.A.
A-6730-M $3.75 / ea.



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Old 02-10-2014, 04:29 PM   #5
George Miller
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Default Re: Engine Oil Drain Plug

Depends if it is a 28 or 29-31 oil pan.
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Old 02-10-2014, 04:32 PM   #6
Gary WA
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Default Re: Engine Oil Drain Plug

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Quote:
Originally Posted by mantta View Post
Can anyone tell me what thread size is on the oil drain plug? I just drained the oil and went to put the plug back in and it would not tighten so, I took it back out and the threads on the plug were almost all gone! (repo) The threads in the pan look okay and I thought I would chase them with a tap first and install a new plug. My thread pitch gauge says 24 TPI and I am guessing it is 3/4" X 24 TPI. Hope this can be verified. Thanks!
Year of engine?? 3/4-24
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Last edited by Gary WA; 02-10-2014 at 07:00 PM.
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Old 02-10-2014, 04:46 PM   #7
mantta
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Default Re: Engine Oil Drain Plug

It is a 1930 engine.
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Old 02-10-2014, 04:59 PM   #8
Patrick L.
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Default Re: Engine Oil Drain Plug

Thread size. See post #2. 3/4" X 24 again.
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Old 02-10-2014, 05:56 PM   #9
Tom Wesenberg
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Default Re: Engine Oil Drain Plug

You could use a plumber's brush or some such round wire brush to clean the threads. I'm usually not a fan of using a tap because it might remove good metal. You could also use the thread gauge and just spin it around the threads to see if it pulls out some stipped thread. A fine pick such as a dental pick could also be used.
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Old 10-01-2022, 05:13 PM   #10
swd
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Default Re: Engine Oil Drain Plug

The wrench size for it is 15/16", Yes?
I mean for the new plug you can buy 3/4 24 thread.
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Old 10-01-2022, 05:48 PM   #11
Gene F
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Default Re: Engine Oil Drain Plug

I always wondered if the magnetic plug would pick up babbit?
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Old 10-02-2022, 07:33 AM   #12
shew01
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Default Re: Engine Oil Drain Plug

Quote:
Originally Posted by Gene F View Post
I always wondered if the magnetic plug would pick up babbit?

If I’m reading this correctly, it looks like tin is a major component of Babbitt. I’m thinking that a magnet will not attract fragments very well. Others may disagree.

https://en.wikipedia.org/wiki/Babbit...y)?wprov=sfti1


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Old 10-02-2022, 03:15 PM   #13
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Default Re: Engine Oil Drain Plug

Shew01, I was thinking the same thing.
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