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Restoration & Repair Tips Board

Pipe plug removal.

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Tray C.

12-24-2006 16:42:35




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I got a question for someone who has had this problem before. I�m trying to remove a pipe plug out of a cast iron hydraulic tank so I can change the oil but the plug is rusted in very tight. I tried using the square head of the ratchet extension but it just rounded off the sides of the plug, I tried drilling it out but the material is too hard and just breaks the bits. I cant tell if its steel or cast iron plug but its driving me crazy and drilling upside down is nearly impossible anyway. I don�t want to heat it because of the risk of an oil fire and I have tried spraying penetrating oil on it to loosen some of the rust but days later its still tight and now the sides are worn down so I have nothing to grip to. I would appreciate any suggestions you guys have as I�m out of ideas.

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souNdguy

01-02-2007 08:56:18




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 Re: Pipe plug removal. in reply to Tray C., 12-24-2006 16:42:35  
Pipe wrench.. Use a file to fit some flats to the plug if you need to.

Thgen once you get it out.. buy a new plug!

Soundguy



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Tray C.

12-24-2006 21:20:48




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 Re: Pipe plug removal. in reply to Tray C., 12-24-2006 16:42:35  
Thanks guys I'm kind of weary of heating things with flamable liquid but I may use it as a last resort if I break another drill bit. I have never heard of the chain trick nor the jack under the drill sounds like they are worth a try. Again thanks.



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JMS/MN

12-24-2006 19:58:08




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 Re: Pipe plug removal. in reply to Tray C., 12-24-2006 16:42:35  
Drilling upside down works ok if there is room for a hydraulic jack under the drill, or room for a pry bar to apply upward pressure. Done the jack thing a number of times on AC rear ends.



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old

12-24-2006 20:04:44




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 Re: Pipe plug removal. in reply to JMS/MN, 12-24-2006 19:58:08  
JMS, another wya is a chain and then twist the drill to the chain tightens up. Learned that trick from an old truck macanic years ago. You twist it so it the bite hangs up it loosen up and will not hurt you as easy



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old

12-24-2006 18:42:00




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 Re: Pipe plug removal. in reply to Tray C., 12-24-2006 16:42:35  
I've run into that problem before and I did use heat. The oil inside will not burn unless you get it way to hot. Just clean the out side good and keep some water etc close just in case of fire. Also if the plug sticks out far enough you can grab it with vise grips and or use a chiesel to get it out. Just be careful if you use the chisel and don't get up into the area that it screws into. Also if you use heat center it in the hole that was made for the socket wrench that way you only heat the plug not the whole area

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george md

12-24-2006 19:16:30




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 Re: Pipe plug removal. in reply to old, 12-24-2006 18:42:00  
Don't heat the plug , that makes the plug expand and get tighter in the hole. Heat the
surounding area to expand the hole away from the plug.

Most likely you will drill the center out of
the plug . Drill the center with a small bit about 1/8 , that will let you drain the oil without making a flood.Then drill with larger bit . With the center drilled with the small
bit , the larger bit will push easier. Once you have weakened the plug with a large hole
(leave no more than 1/8 inch around the hole). Use a SQUARE easy out ( not a spiral one as a spiral one will swell the plug ).

george

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old

12-24-2006 19:21:40




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 Re: Pipe plug removal. in reply to george md, 12-24-2006 19:16:30  
Ya your right it will cause the plug to expand and when it cools it will then let you remove it. You NEVER try to remove a nut, bolt, or plug when its hot or you can/will also pull the treads right out of what ever your removeing. BTDT and will never do it again unless I don't care about keeping the treads good

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Dandy Dave

12-29-2006 09:33:06




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 Re: Pipe plug removal. in reply to old, 12-24-2006 19:21:40  
I've heated hundreds of bolts and 90 percent of the time got them out quicker that way than by by heating the area around it. The bolt does expand and when it cools it contracts. Most of the time it will come out. Dave!



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