LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2004 >> Malibu Maxx >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Mechanical - 3.6L (Ly7) (Repair Instructions - 3 Of 5)) >> Off-Vehicle Repair Instructions (Part 2) >> Oil Pump Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Checking Oil Pump Cover
    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: Inspecting Oil Pump Cover
    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
    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.
scientia non olet · About LEMON Manuals