![]() □ Step 10: Use drastic measures if all else failsĪ pneumatic or electric impact gun should be the tool of last resort because it often simply breaks the bolt. In this example, I used a special female square drive socket that fits the square on the pipe plug. Be sure to use a snug-fitting, proper-sized socket. Paraffin will wick into the threads and act as a lubricant. My favorite trick for removing rusted NPT pipe plugs from cast iron is to heat the surrounding iron, then melt a candle on the threads. I prefer using a very small oxyacetylene tip to concentrate heat in a tight area, but an inexpensive hardware store hand-held propane torch can suffice if you have the room. Fireproof welder's blankets can be used to protect vital parts and paint from flame. Because your vision is narrow through dark, tinted safety glasses, have a spotter watching for telltale smoke or flames. ![]() Many modern cars have extensive amounts of plastic that can melt and catch fire if you are not vigilant.
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