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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2436 (Engine - 6.4L 99R Diesel -- F250-F550 Super Duty) >> General Procedures >> Piston Diameter

Piston Diameter

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    NOTE: When considering installing a new piston, check the cylinder bore out-of-round specifications, cylinder boring may be necessary. Cylinder bore reconditioning will require oversize service pistons.
  1. Use a 75-100 mm (3-4 in) micrometer to measure the piston skirt. Verify piston size by measuring the skirt diameter.
    • Measure 15.5 mm (0.61 in) from the bottom, at 90 degrees to the piston pin, at room temperature of 19-21°C (66-70°F).
    • Install a new piston if not within specification. For additional information, refer to SPECIFICATIONS .
  2. Fig 1: Measuring Piston Skirt Diameter
    GF0034899Courtesy of FORD MOTOR CO.