Exhaust Manifold Cleaning and Inspection

Courtesy of FORD MOTOR COMPANY

Feeler Gauge Set 303-D027D81L-4201-A

General Procedure 

• 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, studs, nuts and/or bolts must be installed when an exhaust manifold is serviced.
  NOTE: Use a straightedge that is calibrated by the manufacturer to be flat within 0.005 mm (0.0002 in) per running foot of length, such as Snap-On® GA438A or equivalent. For example, if the Straightedge is 61 cm (24 in) long, the machined edge must be flat within 0.01 mm (0.0004 in) from end-to-end.

  Using the straightedge and a Feeler Gauge Set, 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.

Courtesy of FORD MOTOR COMPANY