How To Select A Piston

When New Cylinder Block is Used: 

• Check the cylinder bore grade on rear left side of cylinder block, and select a piston of the same grade.
• If there is a corrected stamp mark on the cylinder block, use it as a correct reference.
  Fig 1: Identifying Stamp Mark On Cylinder Block

  Courtesy of NISSAN MOTOR CO., U.S.A.
• A: Front mark
• B: Piston pin bore grade
• C: Piston grade I.D. stamp
• D: Piston crown I.D. code stamp
  Fig 2: Identifying Piston Marks

  Courtesy of NISSAN MOTOR CO., U.S.A.

When a Cylinder Block is Reused: 

1. Measure the cylinder block bore inner diameter.
2. Determine the bore grade by comparing the measurement with the values under the cylinder bore inner diameter of the "Piston Selection Table". Select the piston of the same grade.
   PISTON SELECTION TABLE
   
   

   Unit: mm (in)
   Grade number (Mark)	2 (or no mark)	3
   Inner diameter of cylinder bore	89.010-89.020 (3.5043-3.5047)	89.020-89.030 (3.5047-3.5051)
   Outer diameter of piston skirt	88.990-89.000 (3.5035-3.5039)	89.000-89.010 (3.5039-3.5043)

   NOTE:

   • The piston is available together with piston pin as an assembly.
   • The piston pin (piston pin bore) grade is provided only for the parts installed at the plant. For service parts, no grades can be selected. Only 0 grade is available.