90. Exhaust Manifold Cleaning and Inspection - Right Side

Exhaust Manifold Cleaning and Inspection - Right Side

Cleaning Procedure

1. Clean the exhaust manifold exterior in solvent.
Warning: Refer to Safety Glasses Warning (Safety Glasses Warning).

2. Dry the exhaust manifold with compressed air.

Inspection Procedure




1. Inspect the right exhaust manifold for the following:

* Damage to the exhaust pipe flange sealing surface (1)
* Damage to the threads in the exhaust pipe flange (2)
* Damage to the support bracket (3)
* Damage or broken welds (4)
* Damage to the exhaust manifold-to-cylinder head gasket sealing surface (5)
* Damage or restrictions within the exhaust passages (6)




2. Inspect the right exhaust manifold for the following:

* Damage or excessive corrosion to the exhaust manifold exterior (1)
* Damage to the threads for the heat shield mounting (2)
* Damage to the oxygen sensor threaded hole (3)
* Damage to the exhaust manifold-to-cylinder head mounting holes (4)

3. Repair or replace the exhaust manifold and/or components as necessary.




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