MEngine Mounts are used to connect a car engine to the car frame. They are usually made of rubber and metal. The metal portion connects to the engine on one side and to the frame on the other. The rubber is in-between to provide some flexibility. The major functions of the engine mounting system are to support the weight of the engine and to isolate the unbalanced engine disturbance force from the vehicle structure. The engine is subjected to various vibratory disturbances some external to it others internal. Random shocks from the road, transmitted through suspension, shake it, so do periodic shaking from the universal joints in the propeller shaft. Any rotating unbalances in the engine, transmission or engine mounted accessories are exciters. The number of motor mounts varies from vehicle to vehicle.