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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 994 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Rocker Arm Cover Cleaning and Inspection - Upper

Valve Rocker Arm Cover Cleaning and Inspection - Upper

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 PCV cover screws.
  2. Remove the PCV cover, diaphragm, and spring.
    3. Fig 1: View Of PCV Cover, Diaphragm & Spring
    GM1336134Courtesy of GENERAL MOTORS CORP.
  3. Clean the upper valve rocker arm cover. Remove any sludge or other deposits.
  4. Clean the upper valve rocker arm cover mating surface.
  5. Inspect the upper valve rocker arm cover for cracks or other damage.
  6. Inspect the upper valve rocker arm cover mating surfaces for damage.
  7. Replace the upper valve rocker arm cover if any damage is found.
    8. Fig 2: View Of Upper Valve Rocker Arm Cover Components
    GM1336135Courtesy of GENERAL MOTORS CORP.
  8. Inspect the PCV cover, diaphragm, and spring for damage.
  9. Install the PCV spring.
  10. Install the PCV diaphragm.
  11. Install the PCV cover.
    12. NOTE: Refer to Fastener Notice in Cautions and Notices.
  12. Install the PCV cover screws.

    Tighten:  Tighten the PCV cover screws to 4 N.m (35 lb in).

    13. Fig 3: View Of PCV Cover, Diaphragm & Spring
    GM1336134Courtesy of GENERAL MOTORS CORP.
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