Rounded drain plug
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=123787
Printed Date: 26 Jul 2025 at 6:27am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Rounded drain plug
Posted By: curtis60
Subject: Rounded drain plug
Date Posted: 26 May 2016 at 9:31am
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I was trying to drain the transmission and differential fluid in my wd45 and the differential plug is rounded over. What is the best way to remove it? I tried a open end first with no luck because half of the plug is rounded so i tried a socket and hit it on the all the way and still no luck. I dont have access to a tourch to heat it. Once i get it off where can i get a replacement plug? Thanks in advance
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Replies:
Posted By: DrAllis
Date Posted: 26 May 2016 at 9:43am
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Open end was a bad idea. Six point socket is the best (not 12 point). Might have to get a big chisel dug into it to spin it loose.
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Posted By: Allis dave
Date Posted: 26 May 2016 at 9:46am
You might be able to get it off with a big pair of vice grips. You can buy a set a rounded off bolt removers that work pretty well. They are spiral cut and bite into the head and let you turn it out. It's just a standard pipe plug. You should be able to get one at a hardware store.
These are square head plugs so a standard 6 or 12 point socket won't work. An open end wrench works but tends to round off the head as you've seen. If you an a 4 or 8 point socket set, that works best. I found a snap on set of ebay a few years ago.
http://www.sears.com/craftsman-10-pc-impact-grade-bolt-out-trade-damaged/p-00952165000P?prdNo=3&blockNo=3&blockType=G3" rel="nofollow - http://www.sears.com/craftsman-10-pc-impact-grade-bolt-out-trade-damaged/p-00952165000P?prdNo=3&blockNo=3&blockType=G3
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Posted By: Acdiesel
Date Posted: 26 May 2016 at 10:41am
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WELD A NUT ON. (IF YOU CAN) OR USE A GRINDER TO MAKE 6 FLAT SIDES, KEEP GRINDING TILL YOU CAN GET A SOCKET TO FIT IT.
DAN
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D19 Diesel,D17 Diesel SER.3
2-D14, 2-D15 SER.II WF/NF
D15 SER.2 DIESEL
D12 SER.I, D10 Ser.II
2-720'S D21 Ser. II
Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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Posted By: SPS in WV
Date Posted: 26 May 2016 at 11:00am
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Craftsman makes a socket set for rounded bolt heads, my brother has a set they worked pretty slick.
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Posted By: Ronnie
Date Posted: 26 May 2016 at 11:15am
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U might be able to use a pipe wrench and get it
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Posted By: Stan IL&TN
Date Posted: 26 May 2016 at 11:16am
Get your pipe wrench out. It's made to grip round pipes and will bite into the rounded head.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Posted By: Stan IL&TN
Date Posted: 26 May 2016 at 11:17am
Ronnie is faster on the keys than me. LOL
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Posted By: SHAMELESS
Date Posted: 26 May 2016 at 5:51pm
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you both are...that was my suggestion too! lol
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Posted By: curtis60
Date Posted: 26 May 2016 at 6:29pm
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Thanks for the suggestions. I have a bolt out set but couldnt get a socket on it straight without taking the pto shaft off and ran out of time before i had to head to work. Ill try the pipe wrench though when i get home.
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Posted By: DiyDave
Date Posted: 26 May 2016 at 6:31pm
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Stilson wrench, kinda like a pipe wrench crossed with a pair of vise grips...
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Posted By: Gerald J.
Date Posted: 26 May 2016 at 9:15pm
Knipex Alligator 88-300 looks like water pump pliers but grabs round pipe better than a pipe wrench. The grip gets tighter the harder it turns.
Gerald J.
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Posted By: LeonR2013
Date Posted: 26 May 2016 at 10:15pm
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You probably can't get to it with a hammer, but if you can, give it a good thumpin', then try the pipe wrench.
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Posted By: ihscout
Date Posted: 27 May 2016 at 4:32am
Take a 4-4 1/2 angle grinder with a 1/8"-3/16" thick cutting wheel and create a slot to accept a big flat screwdriver and then turn it with a pipe wrench or channel locks
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'40 AC B - My Pappy always told me "Use your head for something other than a tack hammer!" I did. It makes a great 16 pound sledge hammer.
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Posted By: jaybmiller
Date Posted: 27 May 2016 at 7:27am
I've used a small pipe wrench with great teeth and found the best spot on the nut.The used a 2' pipe as an extension. Holding the pipe wrench 'flat' on the nut, use the free hand to give a good,quick yank on the pipe. Works for me 95% of the time. Using a small pipe wrench is physically easier to line up, hold while underneath !
eVERY 12 point socket should go to the scrapyard..useless as teats on a bull !
Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Posted By: thendrix
Date Posted: 27 May 2016 at 11:04am
Pipe wrench or vice grips then a new plug
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"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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Posted By: Fred in Pa
Date Posted: 27 May 2016 at 4:59pm
Is it the pipe thread .
Until its all said and done . U may end up moving rear cover to drain oil and drill it out .
I have done this on these after someone tried everything else that got it good n rounded off .. Good luck
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He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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Posted By: curtis60
Date Posted: 27 May 2016 at 11:05pm
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Hate to say it but i might have to end up drilling it out. I would assume that at some point they made square sockets to remove these plugs. Anybody have any idea on that? What is the best thing to use to remove them. The location of the differential fill plug there would have to be some type of bit or socket or special wrench they made to get to it out without having to tear the tractor apart. If i have to drill it out i would assume its not any type of hard metal? I tried using the bolt out and couldnt get it to bite on it. I only have a 16" pipe wrench and is to big to get on it to get a good bite on it either. Anything else i should try before trying to drill it out? I dont have a welder readily available but there is a guy not to far from me who has a welding shop i could take it to to try and weld a bolt on it. Should i try this before trying to drill it out? Thanks for all the help
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Posted By: LeonR2013
Date Posted: 28 May 2016 at 3:02am
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Oh absolutely! What do you plan to do with the oil when your drill bit starts to go thru? There is a lot of drilling left to do, so think of all that oil running down over your drill, arm and other body parts. So I would think that driving down to the welding shop would be much easier.
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Posted By: Bob-Maine
Date Posted: 28 May 2016 at 7:41am
Curtis, Be sure to let us know what works on this. Bob@allisdowneast
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I used to think I was indecisive, but now I'm not sure.
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Posted By: Gerald J.
Date Posted: 28 May 2016 at 8:20am
Buying Knipex Alligator will be cheaper than a trip to the welding shop, and after welding something to the plug it will be leaking all the way home because besides giving a wrench surface welding gets the plug red hot and it tries to expand but the casing around it doesn't get nearly so hot (and if its a casting getting a local spot hot can cause it to crack) so doesn't expand and that squishes the soft hot steel plug. Then when it cools it shrinks and leaves a gap and comes out easily.
It would be slow to get in with a file to file a couple flats for an open end wrench, but would not chance fracturing the housing from welding heat. File it to fit a wrench you have.
With old plug out and in your hand a car parts place MAY have a replacement to fit, but that depends on the thread and other dimensions.
There probably is a vintage flat wrench with a square hole that would fit the original plug even in that restricted space or one could be made from a piece of 1-1/2" x 1/4" or 3/8" steel bar stock by drilling and filing to fit. It won't turn the rounded plug though but could fit a new plug. If its a pipe threaded plug the local hardware store will have those plugs.
On a summer vacation in my dad's first new car (1954 Ford Fairlane I block 6) he had oil changed somewhere in New Mexico or Arizona and later at home we found that the kid who changed it used a pair of vice grips on the hex head bolt of the filter canister and the proper wrench no longer fit. I got the task of filing it back hexagonal then, made it a size smaller (probably 9/16 instead of 5/8") and my dad or I did every oil change that car got until he gave it to me as a graduation present in 1963. Being his first ever new car he wiped down the engine every oil change and on trips greased the ball joints on the front end daily while mom prepared lunch.
Gerald J.
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Posted By: Adam Stratton
Date Posted: 28 May 2016 at 9:12am
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You can use the female end of a normal socket extension as the square socket, the use the right size wrench on the male end
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