Crankshaft Sprocket Installation

Special Tools 

EN-48589  Crankshaft Rotation Socket

For equivalent regional tools, refer to Special Tools .

Fig 1: Identifying Crankshaft Sprocket Timing Mark
Courtesy of GENERAL MOTORS COMPANY
1. Ensure the crankshaft sprocket is installed with the timing mark (1) visible.
Fig 2: View Of Crankshaft Sprocket
Courtesy of GENERAL MOTORS COMPANY
2. Install the crankshaft sprocket onto 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 Stage One Timing Mark On Oil Pump Cover & Sprocket Timing Mark
Courtesy of GENERAL MOTORS COMPANY
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  socket. Refer to Timing Chain Alignment Diagram .