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Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
  • Do not reuse the exhaust manifold-to-cylinder head gaskets. Upon installation of the exhaust manifold, install a NEW gasket. An improperly installed gasket or leaking exhaust system may effect On-Board Diagnostics (OBD) II system performance.
  • Inspect the exhaust manifold for cracks near the mounting holes (1-5).
    Fig 1: Exhaust Manifold Bolts
    GM234429Courtesy of GENERAL MOTORS CORP.
  1. Clean the exhaust manifold with solvent.
    2. CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  2. Dry the exhaust manifold with compressed air.
    3. Fig 2: Cleaning Exhaust Manifold Mating Surface
    GM235498Courtesy of GENERAL MOTORS CORP.
  3. Clean the exhaust manifold mating surface.
  4. Use a straight edge and a feeler gage and measure the exhaust manifold mounting face for warpage.

    Exhaust Manifold Maximum Warpage:  0.70 mm (0.0276 in)

  5. If the warpage is greater than the maximum, replace the exhaust manifold.
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