Exhaust Manifold Cleaning and Inspection. Buick Roadmaster 1996

For 1990-2009 cars

Important: Do not reuse the exhaust manifold-to-cylinder head gaskets. Upon installation of the exhaust manifold, install a NEW gasket. A improperly installed gasket or leaking exhaust system may effect OBD II system performance.

1. Clean the exhaust manifold in solvent.
2. Dry the exhaust manifold with compressed air.
3. Inspect the A.I.R. passages for restrictions.
4. Inspect the A.I.R. gasket sealing surface for excessive scratches or gouging.
5. Inspect the exhaust manifold gasket sealing surfaces for damaged.
6. Inspect the take down studs for damaged threads.
7. Use a straight edge and a feeler gage and measure the exhaust manifold-to-cylinder head sealing surface for warpage.

• | Exhaust manifold flanges with warpage in excess of 0.25 mm (0.010 in), must be replaced.