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We recently had a customer call us, that was understandably confused about a Time-Sert thread repair kit. He had purchased a different kit in effort to save money, a smaller less expensive M18x1.5 (Kit #1815), assuming that "M18x1.5" referred to the size of the tap needed for his blown-out spark plug hole. Honestly, it’s a very easy mistake to make. If you pull the tap out of a standard M18x1.5 kit, it has M18x1.5 marked right on the tool. However, there is a massive technical difference b …

When a Save-A-Thread insert fails, it can leave the spark plug hole in your engine significantly larger than its original size. This scenario often requires more robust repair solutions, such as the 389XL Triple Oversize Thread Repair Kit. Here's a comprehensive guide on how to tackle this issue effectively.Understanding the Problem Spark plug threads can become damaged or stripped due to various reasons, including cross-threading, over-tightening, or the failure of previous repair attempts …