CYLINDER HEAD GP 4866232 - Caterpillar

Location of the O-ring seal in the bottom of the transformer extension.Caterpillar recommends applying a small amount of 5N-5561 [340 g (12 oz) tube] or 8T-9020 [6 mL (.20 fl oz) syringe] Silicone Lubricant to the inside diameter of the O-ring seal in the bottom of the transformer extension. (See the illustration for the location of the O-ring seal.) The lubricant will help prevent the this O-ring seal from rolling out of position when the extension is installed on the spark plug. The lubricant will also help prevent the O-ring seal from sticking to the spark plug after the extension has been installed for a long period of time. This will help ease the removal of the transformer extension from the spark plug.