4991799 CUMMINS ISLE Single Cylinder, Air Compressor

This single cylinder air compressor provides essential pneumatic functionality for heavy-duty engine systems. Engineered with high-strength components, the unit features a Ø85.00 cylinder bore and a 56 mm stroke to maintain consistent air pressure. The water-cooled design utilizes a 3/4" - 16 UNF inlet and outlet to manage thermal loads effectively during continuous operation in demanding environments.

4991794 is the OE-equivalent of the CUMMINS 4991799 single cylinder air compressor used in the CUMMINS ISL and ISLE engine series. This component is strictly engineered for compatibility with these specific heavy commercial vehicle engine architectures to ensure seamless integration and system reliability.

For workshop technicians, this unit is designed for direct installation with a through-drive feature and includes an ESS feature for optimized performance. The air inlet port measures Ø25 and the outlet port is M27x2, ensuring precise fitment within the air brake compressor system. Regular inspection of the water cooling ports (3/4" - 16 UNF) and unloader port (M10x1) is recommended during routine maintenance to ensure long-term operational stability.

Maintaining precise tolerances in the swept volume of 318cm³ is critical for the efficiency of the pneumatic circuit. This part serves as a vital component in the air brake compressor assembly, supporting the heavy-duty requirements of modern commercial transport.