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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 2.8L (LWN) Diesel) >> Repair Instructions >> Exhaust Manifold Cleaning and Inspection

Exhaust Manifold Cleaning and Inspection

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  1. GM2243665Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    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.

    WARNING:

    Refer to Safety Glasses Warning .

    Clean the exhaust manifold in solvent.

  2. Dry the exhaust manifold with compressed air.
  3. Inspect the heat shield for damage.
  4. GM1594345Courtesy of GENERAL MOTORS COMPANY

    Use a straight edge and a feeler gauge and measure the exhaust manifold mounting face for warpage.

  5. An exhaust manifold face with warpage in excess of 0.25 mm (0.0100 in) may cause an exhaust leak and may effect OBD II system performance. Exhaust manifolds not within specifications must be replaced.