Parts & Accessories Spare parts FJ Engine Liner Four pieces with their clips for the front two sides of the car The liner and its importance to the car. The liner is an insulator between the front tires and the engine and its surroundings. Many people overlook its importance, and its importance lies in the following: 1- Protecting the engine and its surrounding parts from mud, sludge, sand, and flying stones. 2- Protecting the front tires and the surrounding car parts from the heat emitted by the engine when the car stops, as the heat emitted from the engine is very high. Severe heat reaching the tires and surrounding parts affects them and reduces their lifespan. 3- Improving the car's temperature by preventing the fan's air from escaping from the tire side.