25 09 11 Cummins Compatible Compressor Cylinder Head

What does a compressor cylinder head do?

A Compressor Cylinder Head is the cast service part that closes off the top of an air brake compressor's cylinder block and carries the seats for the inlet and discharge valves. It holds the piston's compressed air without leaking, routes it out through the discharge port, and carries away part of the compression heat from the body.

Compatible vehicles and engines

This component is fitted to a wide range of heavy commercial vehicles, including Kenworth, Freightliner, Peterbilt, and various bus models from Blue Bird, Gillig, and Ic Bus. It is specifically designed for use with Cummins ISB and ISC engines, ensuring precise fitment for applications in trucks, buses, and heavy construction machinery.

Installation and maintenance

When replacing this part, technicians should verify the cooling type—whether air-cooled with external fins or water-cooled via a jacketed body—and ensure the discharge port thread type matches the original specification. Proper installation is critical to prevent gasket leaks caused by even minor deviations in the sealing face flatness.

Troubleshooting and selection

Maintaining the cylinder head helps restore compression efficiency without requiring a complete compressor replacement. For optimal performance in heavy-duty environments, always consult the vehicle service manual for specific torque requirements during assembly.