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Boring Cylinder

  1. Oversize pistons should be selected according to the largest cylinder bore.

    Identification Mark : 25

    Size : 0.25 mm (0.010 in.) O.S.

    NOTE: The size of a piston is stamped on top of the piston.
  2. Measure the outside diameter of the piston to be used.
  3. On the basis of the measured O.D., calculate the new bore size.

    New bore size = Piston O.D + 0.02 to 0.04 mm (0.0008 to 0.0016 in.) (clearance between piston and cylinder) - 0.02 mm (0.0008 in.) (honing margin.)

  4. Bore each of cylinders to the calculated size.
    NOTE: To prevent distortion that may result from temperature rise during honing, bore the cylinders, holes in the firing order sequence.
  5. Hone the cylinders, finishing them to the proper dimension (piston outside diameter + gap with cylinder).
  6. Verify the clearance between the piston and cylinder.
    NOTE: When boring cylinders, finish all four cylinders to the same oversize. Do not bore only one cylinder to the oversize.
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