Lincoln Aviator: Engine System - General Information / General Procedures - Piston Selection

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NOTE: Refer to the appropriate Section 303-01 for the specifications.

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

   • Measure the cylinder bore in 2 directions.
     
   • Select a piston size based on the cylinder bore.
     

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   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.