GMC 12684590 Vibration Damper

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.