Use Undersize Bearing Usage Guide

WARNING: This page is about a different car, the 2004 Infiniti M45 and 2003 Infiniti M45. 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 inner diameter of bearing installed and grind journal until oil clearance falls within specification.
Bearing Undersize Table

Fig 1: Reviewing Bearing Undersize Information

Courtesy of NISSAN MOTOR CO., U.S.A.

CAUTION: Do not damage fillet R [1.5 mm (0.059 in)] when grinding crankshaft main journal in order to use undersized bearing (All journals).

Fig 2: Locating Fillet R (All Main Journal, All Pin Journal)

Courtesy of NISSAN MOTOR CO., U.S.A.