Main Bearing Size Codes

COLOR CODING OF MAIN BEARING SHELLS
Standard bearing shells are Yellow-Yellow or Red-Blue.
Red shells are thinnest, yellow are 0.005 mm (0.0002 in) thicker than red, and blue are 0.005 mm (0.0002) thicker that yellow. Only yellow bearing shells are available as a spare part.

MAIN JOURNAL DIAMETER
Standard 57.981-58.000 mm
First undersize 57.731-57.750 mm
Second undersize 57.481-57.500 mm