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Fitting Pistons

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure piston diameter 1.68" (42.7 mm) below lower land of oil ring at 90 degree angle to piston pin. Replace piston if piston diameter is not within specification. See PISTONS, PINS & RINGS  table under ENGINE SPECIFICATIONS.
  2. Measure cylinder bore diameter at top, middle and bottom of cylinder bore parallel with crankshaft and at a 90 degree angle to crankshaft. Ensure cylinder bore diameter, out-of-round and taper are within specification. See CYLINDER BLOCK  table under ENGINE SPECIFICATIONS.
  3. Ensure piston clearance is within specification. See PISTONS, PINS & RINGS  table under ENGINE SPECIFICATIONS. If piston clearance is not within specification, hone or bore cylinders on cylinder block for oversize pistons. Pistons are available in .010" (.25 mm), .020" (.51 mm) and .030" (.76 mm) oversize.
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