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Injection Pump: Installation

  1. Install injection pump gasket. Position cylinder No. 1 at TDC by lining up crankshaft pulley mark with indicator. Align locating pin on injection pump hub with slot in injection pump driven gear. At the same time, align injection pump timing marks. See Figure.
    Fig 1: Infection Pump Timing Mark Locations
    G09360574Courtesy of GENERAL MOTORS COMPANY

    Cylinder No. 1 must be set at TDC. 

  2. Attach injection pump to front cover. Alignment marks made during removal must be aligned. Tighten nuts. Attach pump to drive gear and tighten bolts.
  3. To complete installation, reverse removal procedure. Check timing and perform on-vehicle adjustments, if required.