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Exhaust Manifold Cleaning and Inspection

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. 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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