BorgWarner 166030 S3A Turbocharger Assembly

The BorgWarner S3A series turbocharger features a fixed geometry turbine housing with integrated wastegate valve and compressor wheel assembly designed for heavy-duty diesel applications. The unit integrates a rotating bearing housing (CHRA) with water-cooled bearing housing for thermal management. It utilizes a piston ring seal system on the turbine side and a labyrinth seal on the compressor side for optimal oil control. This assembly corresponds to manufacturer part numbers 166030 and 312283. Primary OEM cross-references include Scania 312283, Renault 7421660300, and Mack 318391. Interchangeable aftermarket references include 318391 and various repair kit numbers for the S3A frame size. Designed for direct replacement on Renault DXi11, Scania DC11/DC13, and Mack MP7/MP8 engine platforms.