Piston - Diameter

Measure the piston diameter 90 degrees from the piston pin at the point indicated. Refer to SYSTEM & COMPONENT TESTING - GASOLINE for the procedure.
- If out of specification, install new components as necessary. Refer to REMOVAL & INSTALLATION - BLACKWOOD, EXPEDITION, F150 PICKUP & NAVIGATOR - GASOLINE for the procedure.
  
  Fig 1: Measuring Piston Diameter
  Courtesy of FORD MOTOR CO.