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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 906 (Engine Mechanical - 4.3L (LU3)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Valve Rocker Arm Cover Replacement - Left >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the breather tube at the air cleaner outlet duct.
    Fig 1: Disconnecting Breather Tube from Air Cleaner Outlet Duct
    G01977449Courtesy of GENERAL MOTORS CORP.
  2. Remove the air cleaner outlet duct.
  3. Partially drain the cooling system. Refer toDRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
  4. Remove the radiator inlet hose from the water outlet housing. Refer to RADIATOR HOSE REPLACEMENT - INLET (4.3L) in Engine Cooling.
    Fig 2: View of Radiator Inlet Hose
    G01977450Courtesy of GENERAL MOTORS CORP.
  5. Remove the PCV valve hose assembly from the valve rocker arm cover.
    Fig 3: View of PCV Valve Hose
    G01977451Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
    Fig 4: View of Engine Coolant Temperature Sensor Electrical Connector
    G01977452Courtesy of GENERAL MOTORS CORP.

    Important:  A/C compressor and bracket removal is not necessary.

  7. Remove the valve rocker arm cover bolts.
  8. Remove the valve rocker arm cover bolt grommets.
  9. Discard the valve rocker arm cover bolt grommets.
    Fig 5: View of Valve Rocker Arm Cover
    G01977453Courtesy of GENERAL MOTORS CORP.
  10. Remove the valve rocker arm cover.
    Fig 6: Removing Valve Rocker Arm Cover
    G01977454Courtesy of GENERAL MOTORS CORP.
  11. Remove the valve rocker arm cover gasket.
  12. Discard the valve rocker arm cover gasket.
    Fig 7: Removing Valve Rocker Arm Cover Gasket
    G01977455Courtesy of GENERAL MOTORS CORP.
  13. Clean the valve rocker arm cover in cleaning solvent.
  14. Dry the valve rocker arm cover with compressed air.
  15. Inspect the valve rocker arm cover for the following:
    • Damage to the PCV valve grommet (1)
    • Damage to the bolt holes (2)

      A damaged valve rocker arm cover may interfere with the valve rocker arms.

    • Damage to the exterior of the valve rocker arm cover (3)
    • Gouges or damage to the sealing surface (4)
    • Damage to the oil fill tube grommet (5)
    • Restrictions to the ventilation system passages
      Fig 8: Cleaning and Inspecting Valve Rocker Arm Cover
      G01977456Courtesy of GENERAL MOTORS CORP.
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