Fuel Injection Pump Driven Sprocket Removal

Special Tools 

EN-50885-2  Locking Tool

For equivalent regional tools, refer to Special Tools .

Fig 1: Locking Tool Installed
Courtesy of GENERAL MOTORS COMPANY
1. Install the EN-50885-2  locking tool.
   1. Install the housing (3) to the fuel injection pump driven sprocket nut (2). Ensure that the 3 tappets (1) mesh with the 3 slots of the fuel injection pump driven sprocket nut.
   2. Position the ring (4) for a good handling.
   3. Screw in the fixing tool (5) into the fuel injection pump driven sprocket nut.
Fig 2: Extension And Locking Tool
Courtesy of GENERAL MOTORS COMPANY
2. Install a 1/2" extension (1) to the EN-50885-2  locking tool (2) to counterhold.
3. Loosen the fuel injection pump driven sprocket nut.
Fig 3: Fuel Injection Pump Driven Sprocket Nut
Courtesy of GENERAL MOTORS COMPANY
4. Remove the fuel injection pump driven sprocket nut (1).
Fig 4: Pressure Spindle And Locking Tool
Courtesy of GENERAL MOTORS COMPANY
5. Install the pressure spindle (1) to the EN-50885-2  locking tool (2).
Fig 5: Fuel Injection Pump Sprocket, Pressure Spindle And Locking Tool
Courtesy of GENERAL MOTORS COMPANY
6. Press out the fuel injection pump sprocket (2), by screw in the pressure spindle (4) into the EN-50885-2  fixing tool (1).
7. Remove the fuel injection fuel pump driven sprocket.
8. Remove the EN-50885-2  fixing tool from the fuel injection pump driven sprocket.