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: Checking Cylinder Bore Diameter

   Courtesy of HYUNDAI MOTOR AMERICA

   Information 

   Measure position points (from the top of the cylinder block): 30mm (1.1811 in.)/60mm (2.3622in.)/90mm (3.5433in.)

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

   Piston outside diameter  :

   80.97 ~ 81.00 mm (3.1878 ~ 3.1890 in.)

   Fig 2: Checking Piston Outside Diameter

   Courtesy of HYUNDAI MOTOR AMERICA

1. Check the cylinder bore size code on the cylinder block side surface.
   Fig 3: Checking Cylinder Bore Size Code On Cylinder Block Side Surface

   Courtesy of HYUNDAI MOTOR AMERICA
   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 4: Checking Piston Size Mark On Piston Top Face

   Courtesy of HYUNDAI MOTOR AMERICA
   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.)