Main Bearing Housing Inner Diameter

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

Install main bearing cap (2) without installing main bearings, and tighten main bearing cap bolts to the specified torque. Refer to "DISASSEMBLY AND ASSEMBLY " for the tightening procedure.
Measure the inner diameter of main bearing housing with a bore gauge.
Standard: Refer to "CYLINDER BLOCK ".

Fig 1: Identifying Main Bearing Housing Inner Diameter
Courtesy of NISSAN NORTH AMERICA, INC.
If out of the standard, replace cylinder block (1) and main bearing cap as assembly.
NOTE: Cylinder block cannot be replaced as a single part, because it is machined together with main bearing cap.