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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 >> Exhaust Manifold Cleaning and Inspection

Exhaust Manifold Cleaning and Inspection

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. Clean the exhaust manifold.
  2. Clean the exhaust manifold mating surfaces.
  3. Inspect the exhaust manifold for cracks.
  4. Inspect the exhaust manifold mating surfaces for damage.
    5. Fig 1: View Of Exhaust Manifold Inspection Areas
    GM663760Courtesy of GENERAL MOTORS CORP.
  5. Replace the exhaust manifold if any damage is found.
  6. Measure the exhaust manifold flange for warpage with feeler gauge and a straightedge. Replace the exhaust manifold if the warpage is more than 0.3 mm (0.0118 in).
    7. Fig 2: Measure Exhaust Manifold Flange For Warpage
    GM663761Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust manifold heat shield.
    8. NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Install the exhaust manifold heat shield bolts.

    Tighten:  Tighten the exhaust manifold heat shield bolts to 8 N.m (71 lb in).

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