Nissan 22401-ZJ51B Spark Plug

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The manufacturer discourages inspecting spark plug gap on those that have been used for fear of scratching off the platinum or iridium coating that will lead to rapid wear. Among other tools, a spark plug socket, ratchet and different extensions are necessary when replacing spark plugs. Allow the engine to cool completely before removing any plugs and during this time, check the new ones for defects. At one cylinder, disconnect the electrical connector at the ignition coil and remove the bolt, then lift up on the coil/plug boot assembly in order to access the spark plug below. If possible blow dirt or foreign material out of spark plug hole using compressed air to avoid debris dropping into cylinder. Unscrew the spark plugs counterclockwise with a spark plug socket and extension. Compare ispark plug with chart provided to gauge overall running condition of engine. A thin layer of anti-seize compound must be applied to threads before installing new plugs without getting any compound near the lower threads. Turn one of the new plugs into the hole by hand until it can't be turned anymore, then tighten it with a torque wrench or ratchet. To screw in plug use length short rubber hose as tool thus avoiding damaged threads. Change position manually twist boot around tip till properly seated ignition coil, then secure bolt tightly in place Repeat this process for remaining spark plugs.

Allow the engine to cool completely before attempting to remove any plugs.