Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Exhaust Manifold Inspection Areas

Courtesy of GENERAL MOTORS CORP.

Clean the exhaust manifold.
Clean the exhaust manifold mating surfaces.
Inspect the exhaust manifold for cracks.
Inspect the exhaust manifold mating surfaces for damage.
Replace the exhaust manifold if any damage is found.

Fig 2: Measuring Exhaust Manifold Flange For Warpage

Courtesy of GENERAL MOTORS CORP.

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).
Install the exhaust manifold heat shield.

CAUTION: Refer to Fastener Caution .

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