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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Mechanical - 4.4L (4 Of 5)) >> Off-Vehicle Repair Instructions (Part 3) >> Exhaust Manifold Cleaning and Inspection - Right Side - Off Vehicle >> Inspection Procedure

Inspection Procedure

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    Fig 1: Inspecting Right Exhaust Manifold
    GM1351941Courtesy of GENERAL MOTORS CORP.
  1. Inspect the right exhaust manifold and converter assembly for the following:
    • Damage to the exhaust pipe mounting studs (1)
    • Damage to the exhaust pipe flange (2)
    • Damage or broken welds (3)
    • Damage, loose or missing heat shield rivets (4)
    • Damage, loose, missing heat shield (5)
    • Damage to the exhaust sealing area (6)
    • Damage or restrictions to the exhaust passages (7)
    • Damage to the oxygen sensor threaded hole (8)
    2. Fig 2: Inspecting Right Exhaust Manifold & Converter Assembly
    GM1351942Courtesy of GENERAL MOTORS CORP.
  2. Inspect the right exhaust manifold and converter assembly for the following:
    • Damage to the exhaust manifold mounting holes (1)
    • Damage or excessive corrosion to the exterior (2)
    • Damage to the heat shield mounting hole threads (3)
    • Damage or broken welds (4)
  3. Repair or replace the exhaust manifold and converter assembly as necessary.
    4. Fig 3: Measuring Alignment Of Right Exhaust Manifold Flanges
    GM1351945Courtesy 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 (0.010 in) out of alignment.
  5. If the surface flatness is not within specifications, the exhaust manifold is warped and must be replaced.
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