Piston Selection

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The cylinder bore must be within the specifications for taper and out-of-round before fitting a piston.

Select a piston size based on the cylinder bore.

Fig 1: Identifying Cylinder Bore Taper Measuring Directions
Courtesy of FORD MOTOR CO.

NOTE: For precision fit, new pistons are divided into 3 categories within each size range based on their relative position within the range. A paint spot or specific size grade on a new piston indicates the position within the size range.

Choose the piston with the correct paint color or specific size grade.
- Refer to the appropriate article in ENGINE MECHANICAL - 2.5L (EXCEPT HYBRID) , ENGINE MECHANICAL - 2.5L - (HYBRID) , ENGINE MECHANICAL - 3.0L (4V) or ENGINE MECHANICAL - 3.5L for the procedure.
  
  Fig 2: Locating Piston Paint Color
  Courtesy of FORD MOTOR CO.