Drivers side engine mount. 1 per car. Engine mounts are what secure the vehicle’s engine to the frame or subframe. Typically engine mounts are made of rubber and metal, and in some cases polyurethane. These bushings act as a suspension system for the engine, allowing a certain amount of movement. It also provides vibration and noise dampening between the engine and chassis while the engine is running, making a quieter and smoother ride. Rubber bushings can deteriorate due to the exposure of engine oils and extreme temperatures. Signs that your vehicle’s engine mounts need to be replaced include engine movement while driving, clunking or bumping noises, excessive movement in the shifter (manual transmissions)and increase of vibrations during acceleration.