Question about 2000 Mazda Protege

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The threads are stripped and the plug won't seat

My 2000 Protege DX has 178,000 miles. Just had to replace the coil-it was melted and the plug was loose and came out without a wrench. Now the new plug won't screw in because there are no threads. What do I need to do?

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The only correct way to fix your problem is to remove the head and either replace it or have the plug hole re-welded and tapped. That said, there is another option. Install a helicoil thread repair. This can be done in-car if you have a straight unobstructed access to the bad hole because you need to drill and tap threads for the coil. In doing that, you need to consider that some filings will go into the combustion chamber. I usually crank the engine over without the plug installed and use a vacuum to get as much out of there as I can. Only other ting I need to mention is that helicoil has a cross bar at the end that needs to be broken off after install...if you drop it it can so bad things in the engine, or just harmlessly exit through the exhaust. One rule for plug install...always use antisieze compound on plug threads and never forget to tighten any. (two main causes of what you are now looking at.)
good luck, hope it's an easy one.

Posted on Sep 06, 2009

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Tighten
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