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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Exhaust Manifold Cleaning and Inspection

Exhaust Manifold Cleaning and Inspection

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    Fig 1: View Of Left Exhaust Manifold, Gasket, Bolts And Nuts
    GM470679Courtesy of GENERAL MOTORS CORP.
  1. Clean the exhaust manifolds in solvent.
    2. CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  2. Dry the components with compressed air.
  3. Inspect the exhaust manifolds for the following:
    • Damage to the gasket sealing surfaces
    • Damage to the exhaust manifold studs
    • Broken or damaged heat shields
    • Cracks in the exhaust manifold
    • Restrictions within the exhaust passages
    4. Fig 2: Measuring Exhaust Manifold To Cylinder Head Surface For Warpage
    GM66607Courtesy of GENERAL MOTORS CORP.
  4. Measure the alignment or surface flatness of the exhaust manifold flanges, using a straight edge and a feeler gage. Exhaust manifold surface flatness must not exceed 0.254 mm (0.01 in).
  5. If the surface flatness is not within specifications, the exhaust manifold is warped and must be replaced.
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