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Before attempting to gap any DENSO Iridium Power spark plug, please review the specification chart in the front of this catalog to verify the factory-preset gap. In most cases your Iridium Power plugs do not need to be gapped. Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations. Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center.
Whenever possible, it is recommended that the spark plug be installed using a torque wrench. If a torque wrench is not available, tighten in the following manner:
The table on this page gives the recommended torque for proper spark plug installation. Improper installation may cause poor performance, and even result in engine damage.
Note: The installation torque values shown above apply to new spark plugs without lubricating the threads. If threads are lubricated, the torque value should be reduced by approximate 1/3 to avoid overtightening.
This guide is provided for informational purposes only. Always seek the advice of a trained professional before servicing any engine. DENSO is not responsible for the use or misuse of this information and any results thereof. Specifications subject to change without notice.
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