[icaro]

Tap the rim of the plug a few times with a hammer to loosen the threads. more

[pharaon]

Tighten one 18-inch pipe wrench onto the square nut on the top of the plug another around the drain pipe. Support the pipe with one wrench while you turn the nut counterclockwise with the other. here

[Aluminus]

Fit a 2-foot piece of 1-inch steel pipe over the handle of each wrench to give you more leverage if the nut won't turn. Have a helper hold the pipe steady while you turn the plug. Once it begins to turn, remove the pipes and continue turning it with one of the wrenches. [links]

[Matthias Vance]

The longer cast iron plumbing pipes sit in the ground, basement or crawl space without being disturbed, the more corroded and stuck their joints become. When you actually have to unscrew a fitting, it can be a major task. You may not have ever had to remove the clean-out plug until the day that the waste line backs up and you have no other way to reach the obstruction. There's no trick other than loosening the threads with a hammer, bearing down with a pipe wrench and knowing that, in the end, you will succeed. more

[boombox]

Old cast-iron drainpipe can behave unpredictably. Sometimes a small section of a pipe starts to crumble or a joint begins to leak even though most of the pipe is sound. If this is the case, you can easily make a repair. But if a cast-iron pipe is failing at several points, the most economical solution is to replace it with PVC pipe. This is a job for a professional. more

[mcculley]

When working with cast-iron, understand that the pipe is very heavy and must be held in place with special clamps attached to framing members. Never disturb these clamps; as if one weakens, a long section of pipe could come crashing down. Also, some older cast-iron joints were sealed with molten lead, but don't worry. This is not a danger to your health because only wastewater passes through the pipes. here

[kencausey]

Learn how to repair small crumbles or leaks in an old cast-iron pipe. [links]

[Bitpoulsy]

If you need to patch a joint, expect to spend an hour doing so. If you're just patching a hole, it'll take even less time. Before you begin make sure the pipe is well-supported.  more

[aceat64]

I found a good discussion on this topic at DIY (http://www.diynet.com/DIY/post/1,2021,3_175033,FF.html. Hope this helps.
more

[jimmy]

After this, I used the cut-off wheel to slice away portions of the cap until I could get near the inner ring. I then cut slots right up to the edge of the cast iron pipe. here

[JohnDoe]

From there I used a hacksaw to cut vertically from the inside out to the edge of the threads. You can feel and hear when you start grazing the cast iron, so cutting by hand this way is safe. Once I'd cut through the plug in about four places, I tapped the chunks out with a cold chisel. [links]

[pnnac]

I can get a pipe wrench around the plug(outer threads are protruding enough to get a good grip), but it won't move. I don't want to start whacking on the pipe wrench because I don't want to disturb the old pipes. more

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