Repair Procedures: Inspection: Piston

1. Using a gasket scraper, remove the carbon from the piston top.
2. Using a groove cleaning tool or broken ring, clean the piston ring grooves.
3. Using solvent and a brush, thoroughly clean the piston.

   Information 

   Do not use a wire brush.

Piston-To-Cylinder Clearance: 

0.02 ~ 0.04 mm (0.0008 ~ 0.0016 in.)

1. Using a cylinder bore gauge, measure the cylinder bore diameter at position in the thrust and axial direction.

   Cylinder Bore Diameter: 

   81.00 ~ 81.03 mm (3.1890 ~ 3.1902 in.)

   Fig 1: Measure Cylinder Bore Diameter Using Cylinder Bore Gauge

   Courtesy of KIA MOTORS AMERICA, INC.

   Information 

   Measure position points (from the top of the cylinder block):

   30 mm (1.1811 in.)/60 mm (2.3622 in.)/90 mm (3.5433 in.)

2. Measure the piston outside diameter at 35 mm (1.3780 in) from top land of the piston.

   Piston Outside Diameter: 

   80.97 ~ 81.00 mm (3.1878 ~ 3.1890 in.)

   1. Check the cylinder bore size code on the cylinder block side surface.
      Fig 2: Cylinder Bore Size Code On Cylinder Block Side Surface

      Courtesy of KIA MOTORS AMERICA, INC.
      CYLINDER BORE INNER DIAMETER SPECIFICATIONS
      
      

      Size Code	Cylinder Bore Inner Diameter
      A	81.00 ~ 81.01 mm (3.1890 ~ 3.1894 in.)
      B	81.01 ~ 81.02 mm (3.1894 ~ 3.1898 in.)
      C	81.02 ~ 81.03 mm (3.1898 ~ 3.1902 in.)

   2. Check the piston size mark on the piston top face.
      Fig 3: Locate Piston Size Mark On Piston Top Face

      Courtesy of KIA MOTORS AMERICA, INC.
      PISTON OUTER DIAMETER SPECIFICATIONS
      
      

      Size Code	Piston Outer Diameter
      A	80.97 ~ 80.98 mm (3.1878 ~ 3.1882 in.)
      B	80.98 ~ 80.99 mm (3.1882 ~ 3.1886 in.)
      C	80.99 ~ 81.00 mm (3.1886 ~ 3.1890 in.)