Main Bearing Housing Inner Diameter

Install lower cylinder block (2) without installing main bearings, and tighten lower cylinder block 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 ".
If out of the standard, replace cylinder block (1) and lower cylinder block as assembly.

Fig 1: Identifying Main Bearing Housing Inner Diameter
Courtesy of NISSAN NORTH AMERICA, INC.

NOTE: Cylinder block cannot be replaced as a single part, because it is machined together with lower cylinder block.