55. Exhaust Manifold Clean and Inspect

Caution: Refer to Safety Glasses Caution in Service Precautions.

1. Clean the exhaust manifolds in cleaning solvent.
2. Dry the components with compressed air.





3. Inspect the exhaust manifolds for the following:
- Damage to the gasket sealing surfaces (1)
- Damage to the exhaust gas recirculation (EGR) pipe fitting (2) (left manifold)
- Damage to the take down bolt hole threads (3)
- Broken or damaged exhaust manifold heat shields (4) (if applicable)
- Restrictions within exhaust passages
- Damaged or cracked exhaust manifold





4. Measure the alignment or surface flatness of the exhaust manifold flanges, using a straight edge and a feeler gauge. Refer to Engine Specifications.
If the surface flatness is not within specifications, the exhaust manifold is warped and must be replaced.