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Exhaust Manifold cleaning and Inspection

CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
  1. Clean the exhaust manifolds in cleaning solvent.
  2. Dry the components with compressed air.
  3. Inspect the exhaust manifolds for the following:
    Fig 1: Inspecting Exhaust Manifolds
    G01644019Courtesy of GENERAL MOTORS CORP.
    • Damage to the gasket sealing surfaces (1)
    • Damage to the threaded holes (2)
    • Restrictions within exhaust passages
    • Broken or damaged exhaust manifold heat shields (3), if applicable
    • Broken or damaged exhaust manifold.
  4. Measure the alignment or surface flatness of the exhaust manifold flanges using a straight edge and a feeler gage. Refer to ENGINE MECHANICAL SPECIFICATIONS  .
    Fig 2: Measuring Alignment Or Surface Flatness
    G01644020Courtesy of GENERAL MOTORS CORP.

    If the surface flatness is not within the specifications, the exhaust manifold is warped and must be replaced.

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