Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.

Clean the exhaust manifold.
Clean the exhaust manifold mating surfaces.
Inspect the exhaust manifold for cracks.
Inspect the exhaust manifold mating surfaces for damage.

Fig 1: Inspecting Exhaust Manifold Mating Surfaces
Courtesy of GENERAL MOTORS CORP.
Replace the exhaust manifold if any damage is found.
Measure the exhaust manifold flange for warpage with feeler gauge and a straightedge. Replace the exhaust manifold if the warpage is more than 0.3 mm (0.0118 in).

Fig 2: Measuring Exhaust Manifold Flange For Warpage
Courtesy of GENERAL MOTORS CORP.
Install the exhaust manifold heat shield.

NOTE: Refer to FASTENER NOTICE .

Install the exhaust manifold heat shield bolts.
Tighten: Tighten the exhaust manifold heat shield bolts to 8 N.m (71 lb in).