Spark Plug: Description and Operation

DESCRIPTION
The spark plugs are the resistor type with a tapered seat and are used on all engines. No gasket is used on these tapered seat plugs. Always use a good condition 6-point deep socket (with rubber insert) when replacing spark plugs. When setting the gap on a spark plug, use a wire type feeler gage and make the gap adjustment by bending the ground (side) electrode.

All spark plugs with the suffix letter "K" have a lubricated boot release coating baked onto the outer spark plug ceramic. This coating is clear with a slightly waxy feel. The coating helps prevent the silicone spark plug boot from sticking to the spark plug ceramic. This greatly reduces the effort required to remove and install the spark plug boot.

The spark plugs have platinum pads welded to the electrodes. These pads extend the spark plug life to 160,000 kilometers (100,000 miles).