Valve Inspection

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 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.

NOTE: The intake valve has a larger diameter.

Measure each valve stem for wear using a 0-25 mm (0-1 in) micrometer to measure valve stem diameter. Measure the valve at 2 locations 90 degrees apart. Install new valves if they are below the minimum stem diameter specifications. For additional information, refer to SPECIFICATIONS in this service information.

NOTE: To prevent engine damage, the minimum valve margin must be maintained around the entire valve perimeter. 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.

Fig 1: Measuring Valve Margin Using Dial Caliper

Courtesy of FORD MOTOR CO.

Measure the valve margin at 4 locations 90 degrees apart using a dial caliper. Install new valves if they are below the minimum valve margin. For additional information, refer to SPECIFICATIONS in this service information.