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

Removal Procedure

  1. Disconnect the breather tube at the air cleaner outlet duct.
    Fig 1: Breather Tube
    G01661071Courtesy of GENERAL MOTORS CORP.
  2. Remove the air cleaner outlet duct retaining wingnut.
    Fig 2: Air Cleaner Outlet Duct Retaining Wingnut
    G01661072Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the IAT sensor harness connector.
    Fig 3: IAT Sensor Harness Connector
    G01661073Courtesy of GENERAL MOTORS CORP.
  4. Remove the air cleaner outlet duct from the throttle body.
  5. Partially drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
  6. Remove the radiator inlet hose from the water outlet housing. Refer to RADIATOR HOSE REPLACEMENT - INLET (2.2L) or RADIATOR HOSE REPLACEMENT - INLET (4.3L) .
    Fig 4: Air Cleaner Outlet Duct
    G01661074Courtesy of GENERAL MOTORS CORP.
  7. Remove the PCV valve hose assembly from the valve rocker arm cover.
    Fig 5: PCV Valve Hose Assembly
    G01661075Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
    Fig 6: ECT Sensor Electrical Connector
    G01661076Courtesy of GENERAL MOTORS CORP.
  9. Remove the spark plug wire harness retainer from the exhaust gas recirculation (EGR) valve inlet pipe.
  10. Remove the clamp bolt for the EGR valve inlet pipe.
  11. Remove the EGR valve inlet pipe from the intake and the exhaust manifolds.
    Fig 7: EGR Valve Inlet Pipe & Bolt
    G01661077Courtesy of GENERAL MOTORS CORP.

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

  12. Remove the valve rocker arm cover bolts.
  13. Remove the valve rocker arm cover bolt grommets.
  14. Discard the valve rocker arm cover bolt grommets.
    Fig 8: Left Valve Rocker Arm Cover Bolts
    G01661078Courtesy of GENERAL MOTORS CORP.
  15. Remove the valve rocker arm cover.
    Fig 9: Left Valve Rocker Arm Cover
    G01661079Courtesy of GENERAL MOTORS CORP.
  16. Remove the valve rocker arm cover gasket.
  17. Discard the valve rocker arm cover gasket.
    Fig 10: Left Valve Rocker Arm Cover Gasket
    G01661080Courtesy of GENERAL MOTORS CORP.
  18. Clean the valve rocker arm cover in cleaning solvent.
  19. Dry the valve rocker arm cover with compressed air.
  20. 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 11: Inspecting Left Valve Rocker Arm Cover
    G01661081Courtesy of GENERAL MOTORS CORP.
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