3949718 CUMMINS QSL Single Cylinder, Air Compressor

This single cylinder air compressor is engineered to provide consistent pneumatic pressure within the engine's air-handling system. Designed as a critical component for heavy commercial vehicle engines, it utilizes a water-cooling mechanism to maintain optimal operating temperatures during intensive service cycles. The unit features a robust construction with a Ø85.00 cylinder bore and a 56 mm stroke, ensuring high-strength performance in high-demand environments.

3949718 is the OE-equivalent of the CUMMINS 3949718 single cylinder air compressor used in the CUMMINS QSL engine series. This technical component is engineered to meet exact specifications for seamless integration with the original engine architecture. By maintaining strict adherence to the required dimensions and port sizes—including the M27x2 outlet and Ø25 inlet—it ensures reliable operation within the vehicle's pneumatic systems.

For workshop technicians and fleet managers, this part offers precise fitment and simplified installation. The inclusion of a water-cooled valve plate and specific water inlet/outlet ports (3/4" - 16 UNF) allows for efficient heat dissipation. Regular maintenance and checking of the air unloader port (M10x1) and ensuring the through-drive integrity are essential steps for sustaining long-term reliability in heavy-duty commercial applications.