Note:
Do not reuse the exhaustmanifold-to-cylinder head gaskets. Uponinstallation of the exhaust manifold, install a NEW gasket. Animproperly installed gasket or leaking exhaust system may effectOn-Board Diagnostics-(OBD) II systemperformance.Remove the oxygen sensor prior to cleaning the manifold. Donot submerge the oxygen sensor in cleaning solvent.Remove the oxygen sensor-(3) from themanifold.Clean the exhaust manifold-(2) in solvent.Warning:Refer toSafety Glasses Warning.
Dry the exhaust manifold with compressed air.Inspect the heat shield-(1) for damage.Use a straight edge and a feeler gauge and measure theexhaust manifold mounting face-(1) for warpage.
An exhaust manifold face with warpage in excess of0.25-mm(0.0100-in)may cause an exhaust leak andmay effect OBD II system performance. Exhaust manifolds not withinspecifications must be replaced.
#04-00-89-015E: Warranty Administration - Required Operating Procedures (U.S. Only) - (Jun 20, 2013)
Subject:Warranty Administration – Required Operating Procedures (U.S. Only)Models: 2014 and Prior GM Cars and TrucksAttention: GM of Canada Service Agents are not authorized to utilize this service bulletin. GMof Canada Agents should reference the General Motors of Canada Limited Service Policie ...