F 250 2WD Super Duty V8-5.4L (2008)
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Valve Guide: Service and Repair
Valve Guide Inner Diameter
NOTE: Refer to the appropriate information for the specification.
1. NOTE: Valve guides tend to wear in an hourglass pattern. The ball gauge can be inserted into the combustion chamber side of the valve guide if
necessary.
Use a ball gauge to determine the inner diameter of the valve guides in 2 directions at the top, middle and bottom of the valve guide.
2. Measure the ball gauge with a micrometer.
3. If the valve guide is not within specifications, install a new cylinder head assembly.