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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1072 (Engine Mechanical - 6.6L (2 Of 5)) >> On-Vehicle Repair Instructions >> Oil Pump Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Oil Pump Screen, Bolts, Nuts & Gasket
    GM738908Courtesy of GENERAL MOTORS CORP.
  1. If the vehicle is a 2-wheel drive (2WD), remove the flywheel housing. Refer to Engine Flywheel Replacement .
  2. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  3. Remove the upper oil pan. Refer to Upper Oil Pan Replacement .
  4. Remove the oil pump screen bolts and nuts.
  5. Remove the oil pump screen.
  6. Remove and discard the oil pump screen gasket.
    7. Fig 2: Blocking Crankshaft From Turning Using Wooden Handle
    GM660539Courtesy of GENERAL MOTORS CORP.
  7. Block the crankshaft from turning with a wooden handle.
    8. Fig 3: Removing/Installing Secondary Oil Pump Driven Gear Nut While Holding Oil Pump Shaft
    GM776631Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Look for an "L" on the end of the oil pump shaft. If there is an "L" present, the nut and shaft have left hand threads. Service the nut accordingly.
  8. While holding the secondary oil pump shaft with a hex driver, remove the oil pump driven gear nut.
    9. Fig 4: View Of Oil Pump Driven Gear & Nut
    GM738905Courtesy of GENERAL MOTORS CORP.
  9. Remove the oil pump driven gear.
    10. Fig 5: View Of Oil Pump Drive Gear
    GM738904Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not damage the crankshaft reluctor. Do not remove the crankshaft reluctor to oil pump drive bolts.
  10. Remove the oil pump drive gear and crankshaft reluctor.
    • Use a brass drift.
    • Tap on the back as close to the center of the reluctor.
    11. Fig 6: View Of Oil Pump, O-Ring Seal & Bolt
    GM738906Courtesy of GENERAL MOTORS CORP.
  11. Remove the hex head and the allen head bolt in order to remove the oil pump.
  12. Remove the oil pump.
  13. Remove the O-ring seal for the oil pump.
  14. If required, clean and inspect the oil pump. Refer to Oil Pump Cleaning and Inspection .
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