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Drilling Out Oil Pan Drain Plug

A

Anonymous-0

Well-known Member
Posted an earlier message about tips for loosening oil pan drain plug and thanks for the responses. The plug will not come out. After getting under the tractor and getting a good look with a light, the previous owner has the plug so chewed up that there is no choice but grind down the old plug and drill and tap a new one. Two concerns: first...when I drill from the bottom up into the pan is there a problem the metal pieces will work their way and cause an engine problem?? Second: I'm probably going to have to stay with about a 3/8" size hole that is smaller than the original plug...is there a recommend adequate size and thread count that will insure the new plug will not vibrate out??

Thanks Charles
 
Don't drill yet. Weld (or have welded) a nut that has an internal (thread diameter) that is almost the size of the chewed up part, to the exposed chewed up hex. The heat will cause it to break loose, and the nut can be turned to take it out. A wire welder (cheap at Harbor freight) with flux core (you were meaning to buy one) will do it. Jim
 
Thanks for the reply Jim. However, if you would see what previous owner did to the old plug. Never seen anything like it before. Looks like they tried to chisel the plug square but made grooves from the plug square head into the round ridge of the oil pan. I would have to ruin the oil pan to get the plug out. The oil pan costs $373.00 so I figure I best try to drill and tap.
 
Its not that hard to take the pan right off,it likely needs cleaning anyway,torch it red hot,douse in cold water and take the plug out with pliers. If you want to weld a nut on,its easier with the pan off anyway
 

There's gotta be a bazillion used Farmall H oil pans around. I sure wouldn't buy a new one. Remove the oil pan and deal with it off the tractor. If you have to replace it, no big deal. Probably a good idea to take a peek inside anyway, might save a lot of trouble later on.
 
Best to remove the pan.To try and do it upside down would be LOTS more work.Do as Jin says,weld a nut to the stub.even if it's flush you should still be able to weld.Then you can clean up the surface a bit with a grinder,file...
 
Had the same identgical situation, I welded and broke it off and welded and broke it off [about 25 times] and it finally held, and came right out. Just takes patience. And time. I would not dril into several gallons of oil...
 
another vote for taking the pan off.
Being lazy, I fought with one on the tractor for hours.
Finally dropped the pan off, cleaned it, cut a slot in the destroyed
pipe plug with a cut-off wheel, touched it with my torch, and turned it out with a T-lug wrench. took 5 minutes........
 
I've never seen a pipe fitting I couldn't get out by drilling the center out nearly to but not into the threads. Then heat up the remaining part red quickly on one side. Let it cool and the rest will come out easily. I would still take the oil pan off as you are going to get covered with oil if you try to drill it on the tractor.
 
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