Where NOT to Apply Dielectric Grease Equally important to knowing where to apply the grease is understanding where to avoid it. When it comes to spark plugs, applying this grease correctly is a critical step that is often misunderstood.
Spark Plug Terminal Grease Application Video
Apply a small amount of dielectric grease to the inner sleeve of the boot. This substance is an insulator; if it contaminates the gap between the center and ground electrodes, it can disrupt the spark, leading to poor engine performance or misfires.
If you are servicing an existing plug, you should gently pull the boot back slightly, apply a pea-sized amount of grease to the exposed terminal, and then work the boot back into place. The Distributor Cap and Rotor: A Critical Zone Beyond the spark plug wire, the other crucial area where dielectric grease belongs is inside the distributor cap, specifically on the rotor and the terminals where the wires connect.
Watch: Spark Plug Terminal Dielectric Grease Application
Summary of Application Points. By keeping the connection lubricated and moisture-free, the grease ensures maximum voltage transfer from the ignition system to the combustion chamber.
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