Garrett 454231-0006 Turbocharger Assembly GT1749V

The Garrett GT1749V (S2) turbocharger, identified by manufacturer part number 454231-0006, is a variable geometry turbocharger (VGT) designed for the Volkswagen Group 1.9-liter TDI Pumpe Düse (PD) diesel engine series. The unit features a pneumatic actuator for variable nozzle turbine (VNT) control, optimizing boost pressure across the engine operating range. It serves as a direct replacement for OEM part numbers including 028145702R, 028145702H, 028145702L, and 038145702L. The compressor and turbine wheels are engineered for the specific flow characteristics of the 1.9L four-cylinder PD engines, supporting power outputs ranging from approximately 85 kW (115 HP) to 96 kW (130 HP) depending on the specific engine code calibration (AJM, ATJ, AVB, BKE, AFN, AVG, AHH, ASV). The center housing rotating assembly (CHRA) utilizes a water-cooled bearing housing with journal and thrust bearing systems. The turbine housing integrates the VNT mechanism with a pneumatic diaphragm actuator. This turbocharger assembly is applicable to vehicle platforms including the Volkswagen Passat B5/B5.5, Audi A4 B5, Audi A6 C5, and Skoda Superb (first generation) produced approximately between 1999 and 2006. Service parts such as CHRA cartridges (e.g., 433395-0019), repair kits, and actuator assemblies (434855-0012) are available for rebuild applications.