A motor mount is an essential piece of equipment for ensuring a smooth ride and a properly placed engine. The motor mount is the piece that holds the motor in place on the engine frame and keeps it stable as the vehicle runs. If the motor mount becomes old or worn out, the engine may actually start to bounce around in the frame, causing potentially huge damage to the engine and the other mounts around it. If allowed to persist, the engine could slip loose or cause other surrounding parts to bear the brunt of the failure. Staying on top of regular motor mount replacement is essential to preventing very costly repairs.