Pontiac 12551948 Balancer Assembly, Crankshaft

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If the engine has been removed from the car, disregard the following steps which do not apply. Loosen the alternator, power steering pump, and air conditioning compressor as required to relieve tension on the drive belts. Remove the cooling fan and the radiator shroud. Remove the drive belts, noting the installed positions of each. Remove the fan pulley from the water pump shaft. Remove the accessory drive pulley from the harmonic balancer, then remove the retaining bolt at the center of the harmonic balancer. Install a special harmonic balancer remover to the balancer and carefully draw it off the crankshaft, ensuring not to drop it as it breaks free; a common gear puller should not be used as it may separate the outer portion of the balancer from the inner hub, so only a puller that bolts to the inner hub should be utilized. Before installing the harmonic balancer, coat the front cover seal area on the balancer with engine oil. Place the balancer in position over the key on the crankshaft, ensuring the balancer key way lines up with the key. Using a harmonic balancer installer, draw the balancer onto the crankshaft, as this tool distributes the draw evenly around the inner hub. Remove the installation tool and install the harmonic balancer center retaining bolt, torquing to specifications. Follow the removal procedure in reverse order for the remaining components and adjust the tension of the various belts as needed.

Position the damper over the key on the crankshaft, ensuring the damper key way aligns with the key.

Run the engine at the speed during which the vibration occurred and note if it persists.

Install the rod piece in the previously marked hole, and if necessary, install additional pieces of rod in the balancer until the vibration is completely resolved.

Remove the hose from the retaining strap atop the radiator shroud by releasing the end of the strap from the underside of the shroud with pliers, then move the hose to the side.

Attach a puller to the damper and draw it off the crankshaft, being careful not to drop it as it breaks free. Avoid using a common gear puller, as it may separate the outer portion from the hub. Use only a puller that bolts to the hub.