Powertrain mounts are very durable and hardly ever anything is wrong with them but when you find a powertrain mount to be broken or old, it is much appreciated to fix it since additional force that is put onto other auto components can cause more wear and tear of the auto's driveshaft. During the check, the engine or transaxle should slightly be lifted off of the mounts to relieve the load. Start by lifting up the car and supporting it with jack-stands; if the vehicle has an engine splash shield, it should be removed and a jack placed under the engine oil pan but with a large piece of wood in between the jack and the oil pan. Gently lift the engine just enough to relieve the weight off the mounts, but make sure the wood block is not under the oil drain plug. Visually check for cracks, hard rubber and disconnection of the bushing in the middle of the mount, and shake the mount brackets relative to the engine or frame using a screwdriver or prybar. If any movement is observed, lower the engine and re-tighten the mount's nuts and bolts. All engine mounts are replaced similarly; first, to support the engine's weight use the jack, and then remove all the pressure off of the mount in question. Unscrew the bolts situated at both ends of the mount and then proceed to uninstall the faulty mount; afterward, put in the new mount and fasten all bolts in place.