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Engine mounts secure the engine and transmission to the vehicle's frame while isolating vibration, noise, and harshness (NVH) from the cabin. Most mounts use a metal bracket bonded to a rubber or elastomeric bushing, sometimes filled with hydraulic fluid, to absorb engine movement and dampen vibration. When mounts wear out, common symptoms include excessive vibration at idle, clunking or thumping noises during acceleration or deceleration, visible sagging or cracking of the rubber, and engine movement that can be seen when the throttle is opened. Failed mounts can also cause misalignment of drivetrain components and premature wear on other parts. Replacing engine mounts typically involves lifting the vehicle, supporting the engine with a jack or hoist, removing the fasteners, and installing new mounts at the correct torque. The exact procedure varies by vehicle, so consulting the factory repair manual is essential. Regular inspection during routine maintenance can help catch worn mounts before they cause serious damage.