3966520 CUMMINS QSL9 Single Cylinder, Air Compressor

This single cylinder air compressor is engineered to provide reliable pneumatic pressure within heavy-duty engine systems. Designed specifically for high-demand environments, the component features a robust construction with a Ø85.00 mm cylinder bore and a 56 mm stroke, ensuring consistent volumetric output of 318cm³. Its water-cooled design provides superior thermal management to maintain operational stability during extended service cycles.

3966520 is the OE-equivalent of the CUMMINS 3966520 single cylinder air compressor used in CUMMINS QSL9 and QSL engine systems. This technical component is essential for maintaining the air brake and pneumatic systems of heavy commercial vehicles. The precise fitment ensures seamless integration with existing engine architectures, providing a dependable solution for workshop technicians and fleet managers seeking high-strength components.

Installation requires careful attention to the water inlet and outlet ports, which utilize 3/4" - 16 UNF threading. The unit features an M27x2 air outlet port and an M10x1 air unloader port to facilitate correct assembly and pressure regulation. Maintenance of the water-cooling circuit is vital to prevent overheating and ensure the longevity of the single-cylinder mechanism within the engine compartment.