Repair Procedures: Inspection: Piston

1. Using a gasket scraper, remove the carbon from the piston top.
2. Using a groove cleaning tool, clean the piston ring grooves.
3. Using solvent and a brush, thoroughly clean the piston.
   NOTE: Do not use a wire brush.

Clearance:  0.03 ~ 0.05 mm (0.0012 ~ 0.0020 in.)

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

   Standard diameter: 

   92.00 ~ 92.03 mm (3.6220 ~ 3.6232 in.)

   Fig 1: Measuring Cylinder Bore Diameter At Position In Thrust And Axial Using Cylinder Bore Gauge

   Courtesy of HYUNDAI MOTOR AMERICA
2. Measure the piston outside diameter at 14 mm (0.55118 in.) from bottom land of the piston.

   Standard diameter: 

   91.96 ~ 91.99 mm (3.6204 ~ 3.6216 in.)

   Fig 2: Measuring Piston Outside Diameter From Bottom Land Of Piston

   Courtesy of HYUNDAI MOTOR AMERICA

Clearance:  0.03 ~ 0.05 mm (0.0012 ~ 0.0020 in.)

1. Check the cylinder bore size code on the cylinder block.
   Fig 3: Locating Cylinder Bore Size Code On Cylinder Block

   Courtesy of HYUNDAI MOTOR AMERICA
   DISCRIMINATION OF CYLINDER BORE
   
   

   Class	Size code	Cylinder bore inner diameter
   A	A	92.00 ~ 92.01 mm (3.6220 ~ 3.6224 in.)
   B	B	92.01 ~ 92.02 mm (3.6224 ~ 3.6228 in.)
   C	C	92.02 ~ 92.03 mm (3.6228 ~ 3.6232 in.)

2. Check the piston size code (A) and the front mark (B) on the piston top face.
   Fig 4: Locating Piston Size Code And Front Mark On Piston Top Face

   Courtesy of HYUNDAI MOTOR AMERICA
   DISCRIMINATION OF PISTON OUTER DIAMETER
   
   

   Class	Size code	Piston outer diameter
   A	A	91.96 ~ 91.97 mm (3.6204 ~ 3.6208 in.)
   B	B	91.97 ~ 91.98 mm (3.6208 ~ 3.6212 in.)
   C	C	91.98 ~ 91.99 mm (3.6212 ~ 3.6216 in.)