Use Undersize Bearing Usage Guide

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

Use undersize (US) bearing when oil clearance with standard size main bearing is not within specification.
When using undersize (US) bearing, measure inside diameter of bearing installed and grind journal until oil clearance falls within specification.

Fig 1: Bearing Undersize Table
Courtesy of NISSAN MOTOR CO., U.S.A.
CAUTION:
Do not damage fillet R when grinding crankshaft journal in order to use undersized bearing (All journals).
1. Fillet R : 1.5 - 1.7 mm (0.059 - 0.067 in)
Fig 2: Identifying Fillet
Courtesy of NISSAN MOTOR CO., U.S.A.