GM 30020646 Mount

Engine mounts seldom require attention, but broken or deteriorated mounts should be replaced immediately or the added strain placed on the drive line components may cause damage or wear. During the check, the engine must be raised slightly to remove the weight from the mounts. This can be done by raising the vehicle and supporting it securely on jackstands, then positioning a jack under the engine bell housing. A large block of wood should be placed between the jack head and the bell housing, then the engine should be carefully raised just enough to take the weight off the mounts. The mounts should then be checked to see if the rubber is cracked, hardened or separated from the metal plates. Sometimes the rubber will split right down the center. Check for relative movement between the mount plates and the engine or frame by using a large screwdriver or pry bar to attempt to move the mounts. If movement is noted, lower the engine and tighten the mount fasteners. Rubber preservative should be applied to the mounts to slow deterioration. To replace the mounts, disconnect the negative battery cable from the battery, then raise the vehicle and support it securely on jackstands. Remove the nut and detach the mount from the frame bracket. The engine mounts are secured to the frame and engine brackets with nuts. Raise the engine slightly with a jack or hoist, making sure the fan doesn't hit the radiator or shroud. Remove the mount-to-engine bracket nut and detach the mount. Installation is the reverse of removal. Use thread locking compound on the mount bolts and be sure to tighten them securely.