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Just wanted to follow up as promised. It's out! Used plenty of penetrating oil and my air gun. Actually had to go quite a bit higher than I expected...and alternate forward & reverse as suggested. Finally just ZIPPED OUT...with a broken insulator.
All the tips on here were pretty helpful I have to say. THANKS
And I'm thinking that it MAY not have been stripped, but just super tight + rust or whatever. See pic below for your thoughts. It's a black body plug...didn't know that made a difference as someone noted. But the new ones are nickel.
Heat, penetrating chemicals, the shock of an impact wrench, rocking back and forth with a 30" breaker bar - all of that is good stuff, especially in a sequence that makes sense to you. For the socket, be sure to use an impact socket so that the errant plug gets more of the shock.
If all else fails, remove the head and attack the plug from the combustion chamber. Break out the electrode. Try to drill out the threaded part (measure a plug that has already been removed to determine depth of cut) using a graduated series of bits. As you get closer to the threads, it will either give or fold the remaining thin metal. Finally you should then be able to inspect and attempt to restore the threads using the usual methods (chasers/taps) with helicoils as the very last resort.
Good luck.
Glad to hear that you got it out and it doesn't look cross threaded. If you have a thread restoration kit, give that a spin just to make sure that this doesn't happen again anytime soon. Also note the advantages of anti-seize compounds (mostly copper powder).
If you look closely, that plug was never seated all the way. The tops of the threads are jet black from exhaust passing by, as is the outside of the plug, plus the plug seat is not clean like it would have been if it was seated tight to the head, it's all black and sooty like the rest of the plug. It carboned itself in place.
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