F 250 4WD Pickup V6-4.2L VIN 2 (1998)
Piston: Testing and Inspection
Piston-Selection
NOTE: The cylinder bore must be within specifications for taper and out-of-round before fitting a piston.
1. Select a piston size based on the cylinder bore.
NOTE: For precision fig new pistons are divided into three categories within each size range based on their relative position within the range. A
paint spot on the new pistons indicates the position within the size range.
2. Choose the piston with the proper paint color.
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red-in the lower third of the size range.
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Blue-in the middle third of the size range.
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yellow-in the upper third of the size range.
