Silicone dielectric grease

Silicone Dielectric grease is use to aid in installation, and keep moisture away from the high output spark. Silicone dielectric grease is used because is does not cause rubber to swell, and does not break down in high voltage applications. It is a preferred grease for automotive ignition applications because ignition systems use rubber boots to keep the spark plugs and spark plug wires away from moisture Silicone dielectric grease is used on the bottom of the inside of the ignition coil boot where the spark plug meets the ignition coil. For older ignition coils that have cracks, silicone dielectric grease can also be applied to the shaft of the coil to prevent spark jump, but the permanent way to repair spark jump is to replace the boot or the entire coil.

For ignition coils and coil packs that connect to spark plug wires, silicone dielectric grease is use the same way. A thin layer is to be applied to the inside of the boot of the spark plug wire to prevent moisture from entering the spark plug wire end. One common misuse of silicone dielectric grease is applying too much on one area. If a boot is completely packed full with silicone dielectric grease, it can block off the connection points and weaken the spark. Another misuse of silicone dielectric grease is when it is applied to low voltage plug in connectors. This can suppress the connection and not allow voltage to be supplied to the coil.