Holset 3519825 Turbocharger H1B Assembly

The Holset H1B turbocharger (part number 3519825) is designed for Perkins T6.354.4M six-cylinder marine diesel engines produced between 1983 and 2005. This unit features the H1B-6581F compressor and turbine housing configuration, providing fixed-geometry boost control for consistent low-end torque and emissions compliance in commercial marine propulsion. Constructed with high-temperature alloy turbine wheel and precision-balanced rotating assembly, the turbocharger meets OEM specifications for boost pressure, oil flow, and thermal management. Direct replacement for Perkins OEM numbers 3519825, 3519826, 2674331, and 2674332. Includes mounting gasket and heat shield provisions per original design.