2003 GMC Sierra 3500 Timing Chain

You can install the key into the crankshaft keyway, the crankshaft sprocket onto the front of the crankshaft, align the crankshaft key with the crankshaft sprocket keyway, install the sprocket onto the crankshaft until fully seated against the crankshaft flange, the camshaft sprocket and timing chain, the camshaft sprocket bolts, and the oil pump.

You can remove the oil pump, rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned, remove the camshaft sprocket bolts, the camshaft sprocket and timing chain, the crankshaft sprocket, the crankshaft sprocket, the crankshaft sprocket key, clean and inspect the timing chain and sprockets.

The recommended bolt torque is 35 Nm (26 ft. lbs.).