Fuel Injection Pump Driven Sprocket Installation

Special Tools 

EN-50885-2  Locking Tool

For equivalent regional tools, refer to Special Tools .

Fig 1: Fuel Injection Pump, Driven Sprocket, Pump Shaft Wedge, Sprocket Groove And Nut
Courtesy of GENERAL MOTORS COMPANY
1. Install the fuel injection pump driven sprocket (2) to the fuel injection pump (1). Ensure the fuel injection pump shaft wedge (5) and the fuel injection pump driven sprocket groove (4) are aligned.
2. Pre-install the fuel injection pump driven sprocket nut (3).
Fig 2: Pressure Spindle And Locking Tool
Courtesy of GENERAL MOTORS COMPANY
3. Remove the pressure spindle (1) from the EN-50885-2  locking tool (2).
Fig 3: Locking Tool Installed
Courtesy of GENERAL MOTORS COMPANY
4. 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 4: Extension And Locking Tool
Courtesy of GENERAL MOTORS COMPANY
5. Install a 1/2" extension (1) to the EN-50885-2  locking tool (2) to counterhold.
CAUTION:

Refer to Fastener Caution .

6. Tighten the fuel injection pump driven sprocket nut to 64 N.m (47 lb ft).
7. Remove the EN-50885-2  locking tool.