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This article is in video format at the bottom of the page! How severely can a spark plug hole in an aluminum engine head, which previously had a repair insert and has since blown out, making the hole bigger and showing signs of erosion, be damaged and still be fixable? Basically, there needs to be enough material to ream or drill out so that complete threads can be tapped to accept an oversize spark plug insert. The image above shows a spark plug hole after a Napa Fix-A-Thread insert failed, lea …

WiseAutoTools.com © Summary: How to fix stripped threads - SOLVED. Do's and Don'ts, we've done the research. Repair threads by installing a solid bushing type repair insert. This resource page contains FAQ videos and links to our car, light truck and motorcycle aluminum thread repair articles which have helped save our customers save thousands of dollars over the years. Articles are written by Dennis Bandy, a Master Automotive Tech which has had many years of experience working as a flat rate …