Valve Guide Inner Diameter

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, and 2012 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to the appropriate ENGINE article service information for the specification.

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.

Fig 1: Locating Inside Diameter Of Valve Guides

Courtesy of FORD MOTOR CO.

Use a ball gauge to determine the inside diameter of the valve guides in 2 directions at the top, middle and bottom of the valve guide.
Measure the ball gauge with a micrometer.

Fig 2: Measuring Ball Gauge With Micrometer
Courtesy of FORD MOTOR CO.
If the valve guide is not within specifications, install a new cylinder head assembly.