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Piston Diameter

  1. Measure the piston diameter 90 degrees from the piston pin and 42 mm (1.65 in) down from the top of the piston at the point indicated. Refer to ENGINE - 3.9L AND 4.2L article for the procedure.
    • If out of specification, install new components as necessary. Refer to ENGINE - 3.9L AND 4.2L article for the procedure.
    Fig 1: Measuring Piston Diameter
    G03885024Courtesy of FORD MOTOR CO.