Inner Diameter of Cylinder Bore

Using a bore gauge, measure cylinder bore for wear, out-of-round and taper at 6 different points on each cylinder. (X and Y directions at A, B and C). The Y axis is in the longitudinal direction of the engine.
NOTE: When determining cylinder bore grade, measure cylinder bore at B position. Refer to "STANDARD AND LIMIT ".
If the measured value rebore exceeds the limit, or if there are scratches and/or seizure on the cylinder inner wall, hone the inner wall.

Fig 1: Measuring Cylinder Bore Inner Diameter
Courtesy of NISSAN NORTH AMERICA, INC.