Valve Guide Inner Diameter

NOTE: Refer to SPECIFICATIONS (2.5L), SPECIFICATIONS (Hybrid), SPECIFICATIONS (3.0L) and SPECIFICATIONS (3.5L) .

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.
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: Checking Valve Guide Inner Diameter
Courtesy of FORD MOTOR CO.
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.