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Home >> Kia >> 2007 >> Rio Base, Standard >> Repair and Diagnosis >> Engine Mechanical >> Lubrication System >> Engine Overhaul >> Engine Block >> Inspection >> Boring Cylinder

Boring Cylinder

  1. Oversize pistons should be selected according to the largest bore cylinder.
    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 (Outer Diameter), calculate the new bore size.

    New bore size = piston O.D + 0.02 to 0.04mm (0.0008 to 0.0016in) (clearance between piston and cylinder) - 0.01mm (0.0004in) (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: 0.02~0.04mm (0.0008~0.0016in)

    NOTE: When boring the cylinders, finish all of the cylinders to the same oversize. Do not bore only one cylinder to the oversize.
    (1.6 CVVT: Don't use oversize)
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