Ford FCSD Technical Training Manual page 32

LESSON 3: DIAGNOSTICS
Vent Holes
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After removing the EGR valve, do not be alarmed by carbon soot near the vent holes. This is a normal
characteristic of the EGR valves used on the 6.0L engine prior to the 2005 model year.
3-8 27-OCT-04 FIRTFT 6.0L Diesel Engine EGR System