Piston - Diameter

Measure the piston diameter 90 degrees from the piston pin at the point indicated. Refer to ENGINE 4.6L 2V or ENGINE 4.6L 4V .

If out of specification, install new components as necessary. Refer to ENGINE 4.6L 2V or ENGINE 4.6L 4V .

Fig 1: Measuring Piston Diameter 90 Degrees From Piston Pin
Courtesy of FORD MOTOR CO.