GMC 15149543 Mount Assembly, Engine

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If the rubber mounts have hardened, cracked or separated from the metal backing plates, they must be replaced. This operation may be carried out with the engine/transmission still in the vehicle. Disconnect the negative cable from the battery. Raise the front of the vehicle and support it securely on jackstands. Support the engine with a jack. Position a wood block between the jack head and the oil pan and raise it enough to take the tension off the mounts. If equipped, remove the metal heat shield over the mount. Remove the engine mount through-boll. Remove the mount-to-engine bolts and remove the mount. Place the new mount in position. Install the mount-to-engine bolts, lower the engine and install the through-bolt. Tighten all fasteners. Remove the jackstands and lower the vehicle.

Engine mounts are sometimes not problematic, but if they are faulty or worn out, they should be replaced immediately so as to avoid damaging the driveline components by subjecting them to additional strain. This will require a slight lifting of the engine during inspection in order to take off loads from the mounts. To do this, one can raise the vehicle and support it on jack stands before putting a jack under the engine oil pan. A very large piece of wood ought to be sandwiched between the jack head and oil pan and then slowly lift the engine just enough for it to lose contact with the mounts. Once again, it is important to check if there are any cracks on rubber material that make up these engine supports. It would also slow down their destruction if some rubber preservative or WD-40 could be applied. At times you may realize relative motion occurring between mount plates and among other parts such as frame or even an engine itself. When this is noticed, lower your engine down first and then re-tighten mount bolts. For disconnection purposes however, remove negative battery cable from its terminal in battery; while for hoisting purpose raising vehicle onto some stands will be appropriate before attaching an engine hoist on top of it . After lifting slightly again, undo through-bolt nuts then slide off mount through-bolt from frame bracket. In addition, more lifting is necessary until a point where block can get away from unbolting of its corresponding engine mount plate. To install back this component after removal is achieved is what follows next stepwise procedure requires application of Loctite on mount bolts which must finally be tightened firmly too.

Ensure that the procedure is reversed and tighten the nuts and bolts securely.

Start by removing the nut that attaches the insulator to the cross member, as well as the bolts that attach the insulator to the transmission. Then, raise the transmission slightly using a jack and remove the insulator.

Start by removing the nut that attaches the insulator to the cross member, as well as the bolts that attach the insulator to the transmission. Then, raise the transmission slightly using a jack and remove the insulator.

Start by removing the nut that attaches the insulator to the cross member, as well as the bolts that attach the insulator to the transmission. Then, raise the transmission slightly using a jack and remove the insulator.