3949718 CUMMINS QSL9 Single Cylinder, Air Compressor

This single cylinder air compressor serves as a critical component within the pneumatic system of heavy commercial engines. Designed to provide consistent air pressure, the unit features a robust construction to handle the rigorous demands of industrial-grade engine cycles. Its engineering focuses on precision and durability to ensure long-term operational stability in demanding environments.

3949718 is the OE-equivalent CUMMINS single cylinder air compressor used in the CUMMINS QSL and QSL9 engine series. This part ensures seamless compatibility with the original engine architecture, maintaining the essential pneumatic functions required for heavy-duty vehicle operation. The component is specifically engineered to meet the high standards of the original equipment specifications.

For workshop technicians, this unit features a water-cooled design (W) with 3/4" - 16 UNF inlet and outlet ports. The technical profile includes an Ø85.00 cylinder bore and a 56 mm stroke, providing a swept volume of 318cm³. The assembly includes an M10x1 air unloader port and an M27x2 air outlet port for precise pressure regulation. Proper installation and regular maintenance of the cooling system are essential to maintain optimal performance.

This component is designed for seamless integration into existing engine systems, ensuring that the air-to-water cooling interface remains efficient under high thermal loads. The precision-engineered ports and high-strength materials ensure it meets the rigorous standards expected in the heavy commercial vehicle sector.