Method by Calculation

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 bearings (3) to cylinder block (1) and main bearing cap (2), 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 with a bore gauge.
(Oil clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)

Standard and limit: Refer to "MAIN BEARING ".

Fig 1: Identifying Main Bearing Inner Diameter
Courtesy of NISSAN NORTH AMERICA, INC.
If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain the specified bearing oil clearance. Refer to "DESCRIPTION ".