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Piston - Diameter

  1. Measure the piston diameter 90 degrees from the piston pin and 42 mm down from the top of the piston at the point indicated in Fig 1. Refer to GENERAL SPECIFICATIONS for 3.8L engines or GENERAL SPECIFICATIONS for 4.6L engines.
    • If out of specification, install new components as necessary. Refer to PISTON for 3.8L engines or PISTON for 4.6L engines.
      Fig 1: Measuring Piston Diameter
      G03400627Courtesy of FORD MOTOR CO.