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Injection Pump: Installation

  1. Install NEW injection pump gasket. Align locating pin on injection pump hub with slot in injection pump driven gear. At the same time, align injection pump timing marks. Ensure cylinder No. 1 is set at TDC.
  2. Attach injection pump to front cover. Ensure alignment marks made during removal are aligned. Tighten nuts. Attach pump to drive gear and tighten bolts. Reverse removal procedure to complete installation. Check injection pump timing. See INJECTION PUMP TIMING (DIESEL) in ADJUSTMENTS - 6.5L DIESEL article in the ENGINE PERFORMANCE section.


  1. Install NEW injection pump gasket. Align locating pin on injection pump hub with slot in injection pump driven gear while aligning injection pump timing marks.
  2. Attach injection pump to front cover. Ensure alignment marks made during removal are aligned. Tighten nuts. Attach pump to drive gear and tighten bolts. Reverse removal procedure to complete installation. Check injection pump timing. See INJECTION PUMP TIMING (DIESEL) in ADJUSTMENTS - 6.5L DIESEL article in the ENGINE PERFORMANCE section.
Fig 1: Identifying Diesel Injection Pump Components
G94H65596Courtesy of GENERAL MOTORS CORP.
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