Valve Inspection
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Remove all carbon from the valve stems and valve heads using a wire brush.
- Inspect each valve, install new valves if they show evidence of burn marks, warpage, scuffing, bending or valve tip spalling.
- Measure each valve stem for wear using a 0-25 mm (0-1 in) micrometer to measure valve stem diameter. Install new valves if they exceed the minimum stem diameter specifications. For additional information, refer to Specifications.
- Measure the valve face margin at 4 locations 90 degrees apart using a dial caliper. For additional information, refer to SPECIFICATIONS .
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.
NOTE:
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.