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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 457 (Engine Mechanical - 6.6L V8 Diesel) >> Removal & Installation >> Valve Rocker Arm Covers >> Removal (Upper Left)

Removal (Upper Left)

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove retaining bolt in front of shield. Lift up on front of shield. Lift shield off rear bracket. Drain engine coolant. See DRAINING & REFILLING COOLING SYSTEM . Disconnect battery negative cable. Remove upper intake manifold sight shield.
  2. Remove charged air cooler inlet duct to turbocharger charge air cooler outlet. Remove nut retaining battery cable to generator. Remove battery cable to auxiliary generator, if equipped. Remove battery cable harness clip from bracket. Remove bolt retaining battery cable junction block from power steering pump. Move and secure battery cables out of way.
  3. Disconnect fuel hoses. Remove nut retaining fuel hose bracket to upper valve rocker arm cover.
  4. Disconnect fuel injection control module wiring harness connectors. Lift up on latch in order to disconnect connectors. Remove fuel injection control module wiring harness clip from bracket.
  5. Remove bolts retaining fuel injection control module wiring harness connectors. Remove bolts retaining fuel injection control module wiring harness bracket. Remove water outlet tube. Remove glow plug relay bracket. Remove auxiliary generator, if equipped.
  6. Disconnect PCV hose from upper valve rocker arm cover. Remove fuel injector lines. Remove 11 bolts retaining upper valve rocker arm cover. The valve rocker arm cover uses sealer. Avoid damage to sealing surfaces. Using a gasket scraper or other suitable tool at prying locations, loosen upper valve rocker arm cover.
  7. Remove upper valve rocker arm cover. If replacing upper valve rocker arm cover, remove grommets for injector line fittings. If replacing upper valve rocker arm cover, remove screws, PCV diaphragm, and spring. Inspect PCV diaphragm for damage. Replace PCV diaphragm if damage is found. Clean sealer from sealing surfaces on upper valve rocker arm cover and lower valve rocker arm cover.
  8. Clean upper valve rocker arm cover in suitable cleaning solvent. Inspect for cracking and other damage on upper valve rocker arm cover. Replace upper valve rocker arm cover if any damage.
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