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Boring Cylinder

  1. Oversize pistons should be selected according to the largest bore cylinder.
    Fig 1: Piston Chart
    G00325548Courtesy of KIA MOTORS AMERICA, INC.
    NOTE: The size of piston is stamped on top of the piston.
  2. Measure the outside diameter of the piston to be used.
  3. According to the measured O.D., calculate the new bore size.

    New bore size = Piston O.D + 0.03 to 0.05 mm (0.0012 to 0.0020 in.) (clearance between piston and cylinder) -0.01 mm (0.0004 in.) (honing margin.)

  4. Bore each of the cylinders to the calculated size.
    CAUTION: To prevent distortion that may result from temperature rise during honing, bore the cylinder holes in the firing order.
  5. Hone the cylinders, finishing them to the proper dimension (piston outside diameter + gap with cylinder).
  6. Check the clearance between the piston and cylinder.

    Standard : 0.03 - 0.05 mm (0.0012 - 0.0020 in.)

    NOTE: When boring the cylinders, finish all of the cylinders to the same oversize. Do not bore only one cylinder to the oversize.
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