GM 25796383 Bracket, Engine Mount

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Engine mounts are one of the few components that are rarely troublesome, but when they are damaged or worn, they must be replaced right away to avoid damaging other components of the drivetrain. Checking the engine also requires raising it a bit off the mounts to drop the weight off the mounts. Lift the car and safely set it on jack stands; then putting a large piece of wood between the jack head and the engine oil pan, raise the engine only for a moment to take the load off the suspension and then slightly lowering the jack. Check the mounts for brittle rubber deformities, checking if the rubber has cracked or if the mounting has separated from the metal plates, the rubber can also have a central split. Use a large screwdriver or pry bar to palpate for relative motion between the mount plates and the location where the mount connects to the engine or frame; if rotation is detected, use an Allen wrench to tighten the available bolt or bolt and stud further before pronouncing the mounts as broken because this reproduces the symptom of a broken mount in which the engine can be moved around with your hand when the mounts are pried or the vehicle is loaded. In order to remove the mounts bring the vehicle up on jackstands, remove the under-vehicle splash shield if applicable, detach the cable from the negative terminal of the battery. Place the engine on the floor with the aid of the engine support fixture; unbolt the front subframe accompanied by the engine mount to subframe nut and then the engine mount to engine bracket nut to remove the mount from the bracket. Removal is the reverse of installation and requires removal of the mount bolts with non-hardening thread-locking compound applied and tightened to the prescribe torque.