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Oil Pump Installation

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 O-ring to the engine block.
  2. Lubricate the O-ring with engine oil.
  3. Install the oil pump.
    4. Fig 1: View Of Oil Pump
    GM660533Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Install the oil pump bolts.

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

    5. IMPORTANT: Do not damage the crankshaft sensor reluctor teeth.
  5. Install the oil pump drive gear and crank sensor reluctor assembly.
    6. Fig 2: View Of Oil Pump Drive Gear & Crank Sensor Reluctor Assembly
    GM660339Courtesy of GENERAL MOTORS CORP.
  6. Install the oil pump driven gear.
    7. Fig 3: View Of Oil Pump Driven Gear
    GM660532Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not use an impact driver to remove or install the oil pump driven gear nut. Use of an impact driver may shear the oil pump drive gear pin in the crankshaft.
  7. While holding the secondary oil pump shaft with a hex driver, install the oil pump driven gear nut.

    Tighten:  Tighten the oil pump driven gear nut to 100 N.m (74 lb ft).

    8. Fig 4: Removing/Installing Secondary Oil Pump Driven Gear Nut While Holding Oil Pump Shaft
    GM776631Courtesy of GENERAL MOTORS CORP.
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