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Oil Pump Assemble

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Replace the pressure relief valve spring when reusing the oil pump.
  1. Install the following items:
    1. The pressure relief valve
    2. The pressure relief spring
    3. The retaining pin
    2. Fig 1: View Of Pressure Relief Valve, Spring & Retaining Pin
    GM427947Courtesy of GENERAL MOTORS CORP.
  2. Coat the drive gear, the driven gear and the housing gear surfaces with clean engine oil.
  3. Install the drive gear and the driven gear into the pump body. Align the matching marks on the gears. Install the smooth side of the gear toward the pump cover.
    4. Fig 2: View Of Drive Gear & Driven Gear
    GM678107Courtesy of GENERAL MOTORS CORP.
  4. Install the oil pump cover.
    5. Fig 3: View Of Oil Pump Cover
    GM678106Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  5. Install the oil pump cover bolts.

    Tighten:  Tighten the oil pump cover bolts to 12 N.m (106 lb in).

    6. Fig 4: View Of Oil Pump Cover Bolts
    GM678105Courtesy of GENERAL MOTORS CORP.
  6. Inspect the oil pump for smoothness of operation by turning the oil pump driveshaft by hand.
    7. NOTE: Ensure the oil pump driveshaft is inspected for wear and/or damage, and replaced if necessary. An excessively worn or damaged oil pump driveshaft may fail causing severe engine damage.
  7. Install the oil pump driveshaft and the new retainer.
    8. Fig 5: View Of Oil Pump Driveshaft & Retainer
    GM427935Courtesy of GENERAL MOTORS CORP.
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