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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Oil Pump Replacement >> Installation Procedure

Installation Procedure

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.
  1. Install a NEW oil pump O-ring seal.
  2. Install the oil pump.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install the oil pump bolts.

    Tighten:  Tighten the bolts to 21 N.m (15 lb ft).

    4. Fig 1: View Of Oil Pump
    GM738906Courtesy of GENERAL MOTORS CORP.
  4. Inspect the oil pump drive gear for wear.
  5. Replace the oil pump drive gear pin if worn.
  6. Install the oil pump drive gear and reluctor to the crankshaft.
    7. Fig 2: View Of Oil Pump Drive Gear
    GM738904Courtesy of GENERAL MOTORS CORP.
  7. Install the oil pump driven gear.
    8. Fig 3: View Of Oil Pump Driven Gear & Nut
    GM738905Courtesy of GENERAL MOTORS CORP.
  8. While holding the secondary oil pump shaft with a hex driver, install the oil pump driven gear nut.

    Tighten:  Tighten the nut to 100 N.m (74 lb ft).

    9. Fig 4: Removing/Installing Secondary Oil Pump Driven Gear Nut While Holding Oil Pump Shaft
    GM776631Courtesy of GENERAL MOTORS CORP.
  9. Install a NEW oil pump screen gasket to the oil pump.
  10. Install the oil pump screen.
    11. Fig 5: View Of Oil Pump Screen
    GM738908Courtesy of GENERAL MOTORS CORP.
  11. Install the oil pump screen bolts and nuts.

    Tighten:  Tighten the bolts/nuts to 25 N.m (18 lb ft).

  12. Install the engine front cover. Refer to Engine Front Cover Replacement .
  13. If the vehicle is a 2WD, install the flywheel housing. Refer to Engine Flywheel Replacement (Automatic Transmission)  or Engine Flywheel Replacement (Manual Transmission) .
  14. Install the upper oil pan. Refer to Oil Pan Replacement - Upper .
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