6BTA5.9 Cummins Engine Piston Kit 3957797 Parts Catalog Ref No. Part Name Part No. Required 　 Connecting Rod and Piston PP8058 　 　 Engine Piston 4063581 1 　 Engine Connecting Rod 3942581 4 1 Connecting Rod Cap Screw 3900919 8 2 Bushing 4891178 4 3 Engine Connecting Rod 3942580 4 4 Piston Pin 3934047 4 5 Connecting Rod Bearing 3969562 …