GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN 956-1 Extension
    • EN 6347 Holder

For equivalent regional tools, refer to Special Tools.


    Object Number: 2026772  Size: SH
  1. Install the fuel injection pump driven sprocket (2) in the correct position (1).
  2. Install the fuel injection pump driven sprocket nut (3).

  3. Object Number: 2026619  Size: SH
  4. Install the EN 6347 holder  (1) with EN 956-1 extension  (2) to the fuel injection pump driven sprocket.
  5. Caution: Refer to Fastener Caution in the Preface section.

  6. Tighten the fuel injection pump driven sprocket nut to  XX N·m (XX lb ft).
  7. Remove the EN 6347 holder with EN 956-1 extension from the fuel injection pump driven sprocket.