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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 …

Wise Auto Tools: Spark plug thread failure is not exclusive to Ford vehicles, although Ford seems to have the highest number of issues with blown spark plugs or damaged spark plug threads for unknown reasons. However, import manufacturer's like Toyota, Nissan, or others can also experience recurring spark plug thread problems after a repair from a parts store, resulting in enlarged holes.Fortunately, Time-Sert offers a solution for these problems as well. It's important to note that the Tim …