F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Valve: Testing and Inspection
Valve Inspection
1. Remove all carbon from the valve stems and valve heads using a wire brush.
2. Inspect each valve, install new valves if they show evidence of burn marks, warpage, scuffing, bending or valve tip spalling.
3. NOTE: Measure the valve at 3 locations 90 degrees apart. Install new valves for those that exceed the minimum stem diameter.
NOTE: The intake valve has a larger diameter.
Measure each valve stem for wear using a 0-25 mm (0-1 inch) micrometer to measure valve stem diameter. Install new valves if they exceed the
minimum stem diameter specifications.
4. CAUTION: To prevent engine damage, the minimum valve face margin must be maintained across the entire valve face. An insufficient
margin will not provide correct heat dissipation and may lead to valve warpage or breakage. Install a new valve if the margin is less than
the specified minimum.
NOTE: If valve and seats are in a serviceable condition, they may be refaced to the specified angles.
Measure the valve face margin at 4 locations 90 degrees apart using a dial caliper.
