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The Terminator
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<blockquote data-quote="oldmodman" data-source="post: 15456916" data-attributes="member: 10303"><p>Generally corrosion means that when the engine was washed the seal wasn't very good and a lot of water leaked down inside the plug hole. I would give it a ten second squirt with WD-40 and after it has sat a while blast the hole with compressed air to clean out the crud. You may have to do it several times. Then hit the hole with some corrosion spray or Break free if you have that. You want to make it as easy as possible for the plug to break loose without doing any damage to either the threads or the plug (you would hate to have the plug break in half while trying to remove it). It might be best to break it loose, but only a 16th of a turn. Then spray more spray in there. Let it work it's way down past the threads, then turn it out a 1/4 turn at a time. 1/4 turn out, then an 1/8 back in. Just to make sure that it isn't binding some of the crud into the threads.</p><p>I had a car I was working on a month ago with a similar problem. Took an hour or two but i was able to remove all the really rusty, corroded plugs without damaging any of the threads.</p></blockquote><p></p>
[QUOTE="oldmodman, post: 15456916, member: 10303"] Generally corrosion means that when the engine was washed the seal wasn't very good and a lot of water leaked down inside the plug hole. I would give it a ten second squirt with WD-40 and after it has sat a while blast the hole with compressed air to clean out the crud. You may have to do it several times. Then hit the hole with some corrosion spray or Break free if you have that. You want to make it as easy as possible for the plug to break loose without doing any damage to either the threads or the plug (you would hate to have the plug break in half while trying to remove it). It might be best to break it loose, but only a 16th of a turn. Then spray more spray in there. Let it work it's way down past the threads, then turn it out a 1/4 turn at a time. 1/4 turn out, then an 1/8 back in. Just to make sure that it isn't binding some of the crud into the threads. I had a car I was working on a month ago with a similar problem. Took an hour or two but i was able to remove all the really rusty, corroded plugs without damaging any of the threads. [/QUOTE]
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