WD Transmission Oil Plug busted in casting.
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=196049
Printed Date: 23 Aug 2025 at 9:47pm
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Topic: WD Transmission Oil Plug busted in casting.
Posted By: acisbest
Subject: WD Transmission Oil Plug busted in casting.
Date Posted: 07 Jul 2023 at 5:32pm
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Hello, I have a 1953 WD that has a transmission full of milky oil. Its not gear oil and I would like to get all of it out. The middle drain plug is busted in the hole. Should I try to remove it? If so, how? Any ideas? I think I'm going to try to chisel the edges, make a notch and hope that a hammer persuades it to bust loose. I thought that if I parked the rear end up a hill the oil might run down into the pto and drain out there, it did not. Then I tried the front end up a hill, the oil did not run out the rear. Doesn't the whole transmission share the same oil other than the hydraulic cavity? Thanks in advance for any ideas. Regards, Will Southeast PA.  |
Replies:
Posted By: steve(ill)
Date Posted: 07 Jul 2023 at 5:49pm
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I would clean up the face, then center punch and drill a 1/4 inch hole up thru the plug.. let the oil run out if it will... or continue to drill thru with a 3/8 inch drill... once the oil is out, get an easy out and drive into the hole and back the plug out. ------------- Like them all, but love the "B"s. |
Posted By: DrAllis
Date Posted: 07 Jul 2023 at 6:52pm
| Or just drill the hole big enough to thread it to 1/8" pipe thread and leave it that way. Dump some diesel fuel down thru it to clean out the metal mess and to wash away some of the old crappy oil. |
Posted By: HudCo
Date Posted: 07 Jul 2023 at 8:12pm
| if it is a steel plug , it will work on a cast iron one to but much easyer on a steel one weld a flat washer on it then weld a nut to the flat washer let it cool it has tared threads it will probley come out easy |
Posted By: wjohn
Date Posted: 08 Jul 2023 at 12:32am
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I was going to suggest the same thing as HudCo. I had a rounded off square drain plug on my Super M that wouldn't budge, and my best vice grips were just shredding what was left. I welded on an appropriately sized nut and the thing practically came loose by hand. I think the quick influx of heat from the weld was really all mine needed, so maybe a torch would've done the job too. Yours will be a little harder to weld onto as mine still had some material sticking up. ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: acisbest
Date Posted: 08 Jul 2023 at 8:42am
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I'm prepping for the weld method. I like the idea of welding on the washer. That will contain the weld footprint. I'll keep you all posted. Thank you! |
Posted By: steve(ill)
Date Posted: 08 Jul 2023 at 8:57am
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put your ground cable as close as possible.. dont let current flow thru a bearing from the stinger to ground cable. ------------- Like them all, but love the "B"s. |
Posted By: HudCo
Date Posted: 08 Jul 2023 at 9:44am
| i use the ground clamp to hold the washers and nut in place while welding |
Posted By: acisbest
Date Posted: 10 Jul 2023 at 1:37pm
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Tried to weld a washer to the drain plug, then I welded a nut on the washer. Water started leaking out of the plug so the heat must have opened things up. Waited a few hours to let everything drain. Put a wrench on the nut and it fell off. So, I was not able to get good penetration. Tried about three other times, could not get a good weld on it. So, decided to drill it out and pipe thread it. Only about 1/8 of thread but I think it will hold. Good enough for a tractor I use about 1 to 2 hours a year.   |
Posted By: steve(ill)
Date Posted: 10 Jul 2023 at 3:06pm
plug was probably cast iron... That dont weld so good... OLD rusted out cast iron is even worse... Most of them plugs are HOLLOW on the inside.. If you have problems with the threads, drill out to a 3/8 pipe and rethread.. Probably be thicker metal the further out into the old plug you go.
 ------------- Like them all, but love the "B"s. |
Posted By: IBWD MIke
Date Posted: 11 Jul 2023 at 8:17am
That was my thought when people mentioned welding the nut on. Other than the issue with the chips it would drill/tap nicely. I would have tried the easy out first though. I have a 149 Cub Cadet that had a stripped oil drain plug when it got here. Found one a little oversize and a corresponding tap. Actually used a reamer, hand turned, to size the hole. Tapping went well, flushed the chips out with diesel fuel about three times. Still going good and no worries about the plug falling out.
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steve(ill) wrote: