GM 12684590 Balancer Assembly, Crankshaft

This procedure, as is the case with any balancer installation, needs a balancer installation tool, and a new harmonic balancer bolt hence, the reader is advised to go through the entire procedure and ensure that he has all the recommended tools and materials. First of: remove the cable from the grounding terminal of the battery. Next, jack up the front of the vehicle and position the jack stands correctly after which engage the parking brake. Take off the drivebelt, air conditioning compressor belt, and vacuum pump bell; then, the cooling fan and shroud assembly. First of all, and at the bottom of the car, unbolt and take out the stone shield if it is provided, and then take out the starter motor. Slot a driveplate holding tool onto the ring gear teeth and screw it to the engine block. The balancer can be removed using a puller; the jaws of which, should only rest on the hub of the balancer and not the outer ring. It is recommended to use the proper adapter or a long Allen-head bolt in the case inserted into the crankshaft nose to apply force on its smooth tapered tip to avoid destruction of the crankshaft thread. Place the crankshaft pulley/harmonic balancer over the crankshaft and slide it up as much as possible then use the Balancer Installation tool to tap it into place. Replace the old harmonic balancer bolt with the new one; tighten it to the required torque then measuring the distance from the crankshaft snout to the balancer hub it should go 3/32 in to 11/64 in beyond the crankshaft snout. If the indicated measurement is off, then refer to the balancer installation tool, place the balancer by pressing on the measurement until the correct measurement is displayed. Lastly, fit a new harmonic balancer bolt and, in turning the balancer to the tight position, apply the specified FIG torque and rotate to the specified angle of turn back, follow the reverse process of removing it.

This procedure requires a special balancer installation tool and a new harmonic balancer bolt, so it is important to read through the entire process and gather the necessary tools and materials beforehand. Begin by disconnecting the cable from the negative terminal of the battery. Next, raise the front of the vehicle and support it securely on jackstands, then apply the parking brake. Remove the drivebelt, air conditioning compressor belt, and, for 5.3L/6.2L models, the vacuum pump belt, followed by the cooling fan and shroud assembly. Working under the vehicle, remove the stone shield from below the engine if equipped, and then remove the starter motor. Install a driveplate holding tool into the ring gear teeth and bolt it to the engine block. Use a puller to remove the balancer from the crankshaft, ensuring the puller jaws only contact the hub of the balancer and not the outer ring. Insert the proper adapter or a long Allen-head bolt into the crankshaft nose for the puller's tapered tip to push against, preventing damage to the crankshaft threads. Position the crankshaft pulley/harmonic balancer on the crankshaft and slide it on as far as it will go, then use the balancer installation tool to press it onto the crankshaft. Install the old harmonic balancer bolt and tighten it to the specified torque, then measure the distance from the snout of the crankshaft to the balancer hub; the hub should extend 3/32 to 11/64-inch past the crankshaft snout. If the measurement is incorrect, reinstall the balancer installation tool and press the balancer on until the measurement is correct. Finally, install a new harmonic balancer bolt and tighten it to the specified torque and angle of rotation, completing the installation by reversing the removal steps.

Insert a long Allenhead bolt into the crankshaft nose for the puller's tapered tip to push against, or use an adapter on the end of the crankshaft.

Position the crankshaft pulley/balancer on the crankshaft and slide it on as far as it will go.