Exhaust Manifold Cleaning and Inspection
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- NOTE:
Do not reuse the exhaust manifold-to-cylinder head gaskets. Upon installation of the exhaust manifold, install a NEW gasket. An improperly installed gasket or leaking exhaust system may effect On-Board Diagnostics (OBD) II system performance.
WARNING:Refer to Safety Glasses Warning .
Clean the exhaust manifold in solvent.
- Dry the exhaust manifold with compressed air.
- Inspect the heat shield for damage.
Use a straight edge and a feeler gauge and measure the exhaust manifold mounting face for warpage.
- An exhaust manifold face with warpage in excess of 0. 25 mm (0. 0100 in) may cause an exhaust leak and may effect OBD II system performance. Exhaust manifolds not within specifications must be replaced.
WARNING:
Refer to Safety Glasses and Compressed Air Warning .