Undersize Bearing Usage Guide

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

Use undersize bearing when oil clearance with standard size main bearing is not within specification.
CAUTION: Keep fillet R when grinding crankshaft journal in order to use undersize bearing (all journals).
When using undersize bearing, measure the bearing inner diameter with bearing installed, and grind journal until oil clearance falls within specification.

Fig 1: Keep Fillet R When Grinding Crankshaft Journal In Order To Use Undersize Bearing (All Journals)

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