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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Valve Rocker Arm Cover Replacement - Upper Right >> Removal Procedure

Removal Procedure

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. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls - 6.6L (LLY).
  3. Loosen the charged air cooler outlet duct to intake hose clamp.
    4. Fig 1: View Of Charged Air Cooler Outlet Duct
    GM1334381Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damaged. Loosen the hose by twisting.
  4. Remove the charged air cooler outlet duct from the intake.
  5. Remove the fuel injection control module. Refer to Fuel Injection Control Module Replacement in Engine Controls - 6.6L (LLY).
  6. Remove the exhaust gas recirculation (EGR) cooler tube. Refer to Exhaust Gas Recirculation (EGR) Valve Cooler Tube Replacement in Engine Controls - 6.6L (LLY).
  7. Remove the heater outlet hose bolt from the bracket.
  8. Position the heater outlet hose out of the way.
  9. Remove the fuel filter bracket bolts.
  10. Reposition the fuel filter with bracket.
    11. Fig 2: View Of Fuel Filter Assembly
    GM1334875Courtesy of GENERAL MOTORS CORP.
  11. Remove the positive crankcase ventilation (PCV) hose/pipe. Refer to Crankcase Ventilation Hoses/Pipes Replacement .
  12. Prior to removing the fuel injector pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean of debris.
  13. Spray lithium grease, GM P/N 12346293 or equivalent, between the fuel injector line and fittings to assist in containing any debris during removal.
    14. NOTE: DO NOT use compressed air to clean debris from the fuel injector inlet after the fuel line is removed. Using compressed air can allow debris to enter the fuel injector inlet and damage the fuel injector.
  14. Remove the right fuel injector pipes.
    15. Fig 3: View Of Fuel Injector Pipes
    GM1335614Courtesy of GENERAL MOTORS CORP.
  15. Remove the upper valve rocker arm cover bolts.
  16. Remove the upper valve rocker arm cover.
  17. Remove the upper valve rocker arm cover gasket.
    18. Fig 4: View Of Upper Valve Rocker Arm Cover & Gasket
    GM1335653Courtesy of GENERAL MOTORS CORP.
  18. Inspect the upper valve rocker arm cover gasket for damage, replace if necessary. Otherwise reuse the old gasket.
  19. If required, clean and inspect the upper valve rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection - Upper .
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