Inspection Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the exhaust manifold for the following:
- Damage to the pipe flare (1)
- Damage to the pipe flange (2)
- Damage or excessive corrosion to the exhaust manifold exterior (3)
- Damage to the converter pipe studs (4)
- Damage to the converter pipe gasket sealing surfaces (5)
Fig 1: Checking Right Exhaust Manifold (1 Of 2)
Courtesy of GENERAL MOTORS CORP.
Inspect the exhaust manifold for the following:
- Damage to the oxygen sensor threaded hole (1)
- Damage to the EGR pipe fitting (2)
- Damage to the exhaust manifold mounting holes (3)
- Damage to the gasket sealing surfaces (4)
- Damage or restrictions within the exhaust passages (5)
- Damage or broken welds

Fig 2: Checking Right Exhaust Manifold (2 Of 2)

Courtesy of GENERAL MOTORS CORP.

Repair or replace the exhaust manifold and/or components as necessary.
Measure the alignment or surface flatness of the exhaust manifold flanges, using a straight edge and a feeler gauge. Exhaust manifold surface flatness must not exceed 0.254 mm (0.010 in).
If the surface flatness is not within specifications, the exhaust manifold is warped and must be replaced.

Fig 3: Measuring Right Exhaust Manifold Flanges Surfaces
Courtesy of GENERAL MOTORS CORP.