6CT8.3 Cummins Main Bearing Set 3945917 Parts Catalog Ref No. Part Name Part No. Required 　 Main Bearing Set 3945917 Standard 　 Main Bearing       3944153 7 　 Main Bearing       3944158 6 Standard Crankshaft Thrust Bearing       3944163 1 　 　 　 　 　 Main Bearing Set 3945918 0.25mm Oversize 　 Main Bearing       3944154 7 　 Main Bearing       3944159 6 0.25mm Oversize …