Undersize Bearing Usage Guide: Notes

When the specified main bearing oil clearance is not obtained with standard size main bearings, use underside (US) bearing.
When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and grind main journal so that the main bearing oil clearance satisfies the standard.

CAUTION: In grinding crankshaft main journal to use undersize bearings, keep the fillet R [1.5 - 1.7 mm (0.059 - 0.067 in)].

Fig 1: Caution Grinding Crankshaft Main Journal

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

Bearing undersize table

BEARING UNDERSIZE - THICKNESS SPECIFICATION

Unit: mm (in)
Size	Thickness
US 0.25 (0.0098)	2.132 - 2.140 (0.0839 - 0.0843)