GM 12675716 Balancer Assembly, Crankshaft

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Specific for this procedure are the Counterfeit balancer bolt, balancer installation tools and the flywheel driveplate ring gear holding tools which are available to tool manufacturers, only. First remove the nut of the cable from the negative terminal of the battery, free the front wheel lug nuts, lift the front end of the car and support it on jackstands and apply the parking brake. Pull off the wheels, pull the under-vehicle splash shield, if there is any, and the drivebelts. Subsequently, it is necessary to remove steering gear as well as the starter motor; in addition, at this stage, one should install a flywheel/driveplate ring gear holder. For the models of manual transmission, one should make a locating mark from the extremity of the crankshaft to the harmonic balancer; it should be noted that there are some LS models that do not utilize a key for positioning and as such any marks made before the removal process would be quite vital in the process of reinstallation. Bolt on the balancer and set the distance from the balancer to the end of the crankshaft snout to the original measurements before taking it off, the end of the crankshaft snout should be recessed into the balancer by 2.38 to 3.5 mm. Installation: To remove the balancer from the shaft, use the three-jaw puller placing the jaws on the hub only; if fitted remove the washer from one end of the balancer. Make sure that the hand of the proper adapter is placed properly on the crankshaft nose to avoid stripping of the threads and if there are balance weights such as on the old balancer, transfer them to the new balancer. If there is such a balancer washer, then it should be installed to the end of the balancer, the crankshaft pulley/balancer has to be placed on the crankshaft and aligned with the earlier made marks. For automatic transmission models, it is possible to align the grooves on the hub to the Woodruff key, located in the crankshaft. Employ the services of a harmonic balancer installation tool to fit the crankshaft pulley/balancer onto the crankshaft while fitting the old harmonic balancer bolt to about 240 ft-lbs. If the current crankshaft pulley bolt appears worn out, then, it should be removed and alongside measures the distance from the end of the crankshaft snout to balancer upon discovering that it is not right, correct it. Then, torque and also angle to 270 degrees a new harmonic balancer bolt in order to complete the procedure for installation to reverse the steps of removal.

Use the specialized crankshaft balancer installation tool to press the crankshaft pulley/balancer onto the crankshaft, then install the old crankshaft balancer bolt and tighten it to 240 fl-lbs (330 Nm).

Install a new crankshaft balancer bolt and tighten it in two steps to the specified torque and angle of rotation, using a torque angle gauge to complete the tightening sequence.