GM 10083171
Crankshaft Gear

To service and repair the Crankshaft Gear and sprocket, one will be needing the following tools. Crank shaft gear remover ( J 5825-A) and crank shaft gear installer (J 5590). The first step is to take off the engine front cover and the crankshaft position sensor reluctor ring. Install to rotate the engine, should be a 7/16-20 x 1 inch bolt at the end of the crankshaft making sure it is not the crankshaft balancer bolt or over an inch long and it will cause harm. Support the crankshaft with the socket wrench by holding it in place and rotate it all the way until the mark on the second sprocket is lined up with the first one and cylinder number four is up at top dead center (TDC) on the compression stroke. Next, unbolt the camshaft sprocket bolts, and then camshaft sprocket and Timing Chain. Replace the Crankshaft Gear remover (J 5825-A) to remove the crankshaft sprocket and extract the crankshaft balancer key. Clean and dry all components, checking out for cam Timing Chain wear damage to the cam sprocket as well as the engine crankshaft sprocket wear or damage. For installation, put the crankshaft balancer key into a crank keyway so that it is parallel, or slightly leans. Make the keyway of the crankshaft sprocket coincide with the balancer key and install it using the Crankshaft Gear installer (J 5590). Install the camshaft sprocket with its alignment mark at 6 o'clock, while both sprockets are to be aligned correctly at 12 o'clock and 6 o'clock respectively. If the camshaft sprocket bolts have been replaced, tighten them to 25 nm (18 ft. Lbs.) then install the crank shaft position sensor reluctor ring with the balancer key and utilizing the Crankshaft Gear installer (J5590) to seat it all the way in. Last but not least, pull off the bolt from the crankshaft and put the engine front cover on.