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Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
SPECIAL TOOL CHART

G03901974
 Straight Edge 303-D039 (D83L-4201-A) or equivalent
  1. Clean the exhaust manifold using a suitable solvent. Use a plastic scraping tool to clean the gasket sealing surfaces.
    2. NOTE: New exhaust manifold gaskets, nuts and/or bolts must be installed when an exhaust manifold is serviced.
    Fig 1: Checking Exhaust Manifold Sealing Surface For Warpage
    G03913726Courtesy of FORD MOTOR CO.
  2. Using the special tool (or a precision straight edge) and a feeler gauge, check the exhaust manifold sealing surface for warpage. If the warpage is greater than 0.76 mm (0.0299 in), install a new exhaust manifold.
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