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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Mechanical - 3.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Oil Pump Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Oil Pump Inspection Areas
    GM1579183Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: There are no serviceable components within the oil pump. Disassemble the pump only to diagnose an oiling concern. A disassembled oil pump must not be reused. A disassembled oil pump must be replaced.
  1. Inspect the oil pump housing for the following:
    • Damage, scoring, or debris on the housing surface for the driven gear (1)
    • Damage to the oil pump mounting bosses (2)
    • Damage, scoring, or debris on the housing surface for the drive gear (3)
    • Damage, scoring, or debris in the oil pump relief valve port (4)
    • Damage, scoring, or debris in the oil pump intake port (5)
    • Damage, scoring, or debris in the oil pump relief valve bore (6)
    • Damage, scoring, or debris in the oil pump output port (7)
    • Damage to the threads in the oil pump housing for the oil pump cover bolts (8)
    2. Fig 2: View Of Oil Pump Inspection Locations
    GM1579184Courtesy of GENERAL MOTORS CORP.
  2. Inspect the oil pump cover for the following conditions:
    • Damage to the oil pump cover mounting bosses (1)
    • Damage, scoring, or debris in the oil pump cover oil passages (2)
    • Damage to the sealing surface between the oil pump cover and the oil pump housing (3)
    3. Fig 3: Locating Inspection Areas On Inner Drive Gear
    GM902926Courtesy of GENERAL MOTORS CORP.
  3. Inspect the inner drive gear for damage. If inner diameter damage is found, ensure the crankshaft is also inspected.
    4. Fig 4: Checking Outer Driven Gear
    GM902927Courtesy of GENERAL MOTORS CORP.
  4. Inspect the outer driven gear for damage.
    5. Fig 5: Inspecting Oil Pump Relief Valve Components
    GM902929Courtesy of GENERAL MOTORS CORP.
  5. Inspect the oil pump relief valve components for debris or damage.
    6. Fig 6: View Of Primary Camshaft Drive Chain Lower Guide Inspection Locations
    GM1579175Courtesy of GENERAL MOTORS CORP.
  6. Inspect the primary camshaft drive chain lower guide for damage (1-3).
  7. If debris or damage is present within the oil pump, further inspection of all of the engine components is necessary.
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