3948846 CUMMINS QSL9 Single Cylinder, Air Compressor

This single cylinder air compressor serves as a critical component within the engine's pneumatic system, ensuring consistent air pressure for heavy commercial vehicle applications. Designed with a high-strength build, the unit utilizes a water-cooling system to maintain optimal operating temperatures during heavy-duty service cycles. The technical configuration includes a precision-engineered Ø85.00 cylinder bore and a 56 mm stroke, providing a swept volume of 318cm³ for reliable output.

3948846 is the OE equivalent of the CUMMINS 3948846 single cylinder air compressor used in the CUMMINS QSL9 and QSL series engines. This component ensures seamless integration with existing engine architectures, maintaining the rigorous standards required for heavy-duty industrial performance. The part is engineered to meet the exact specifications of the original equipment to prevent system pressure fluctuations.

For workshop technicians, this unit features an M27x2 air outlet port and an M10x1 unloader port, alongside specialized water inlet and outlet ports (3/4" - 16 UNF) for efficient thermal management. The inclusion of the ESS feature and a water-cooled valve plate ensures stability under varying load conditions. Maintenance teams should ensure all connections are secure and cooling passages are clear to maintain optimal service intervals and prevent overheating in the field.