Tools Required

EN-48589  Crankshaft Rotation Socket. See Special Tools .

Fig 1: Identifying Crankshaft Sprocket Timing Mark
Courtesy of GENERAL MOTORS CORP.
1. Ensure the crankshaft sprocket is installed with the timing mark (1) visible.
Fig 2: View of Crankshaft Sprocket
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2. Install the crankshaft sprocket on to the nose of the crankshaft.
3. Align the notch in the crankshaft sprocket with the pin in the crankshaft.
4. Slide the crankshaft sprocket on the crankshaft nose until the crankshaft sprocket contacts the step in the crankshaft.
Fig 3: View of Crankshaft and Timing Mark
Courtesy of GENERAL MOTORS CORP.
5. Ensure the crankshaft is in the stage one timing position with the crankshaft sprocket timing mark (1) aligned to the stage one timing mark on the oil pump cover (2) using the EN-48589  . See Special Tools . Refer to Camshaft Timing Drive Chain Alignment Diagram (Fourth Design) - Stage One.