Heating the area around the broken plug does not work very well because the cast iron takes so long to heat that the broken piece will also get just as hot or hotter defeating the reason for the heat. It can help with aluminum heads but not for cast iron.
The Tractor Vet's method works much better. By heating the broken plug and not the head you force the plug to expand more than the hole in the head. By getting it red hot you get the metal in the plug to a point where it deforms. When it cools down it will be smaller than the original size allowing it to be removed much easier. Do not use this method with aluminum heads.
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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