25 01 51 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. This component is essential for maintaining stable air pressure within the pneumatic braking system.

Compatible vehicles and engines

This cylinder head is engineered to fit heavy commercial vehicles equipped with Cummins N14 and ISM engines. It is also fitted to Ford Trucks, Kenworth, Peterbilt, Western Star, Volvo, Freightliner, International, and Gillig trucks and buses. Due to different compressor architectures, selection should always be based on the specific compressor reference number.

Installation and maintenance

Installation requires precise alignment with the cylinder block to ensure a proper seal. Technicians should verify that the bolt hole pattern and port dimensions match the existing unit to prevent air leaks or pressure drops. Maintaining correct torque during assembly is vital for long-term durability under high-pressure operating conditions.

Troubleshooting and selection

Monitoring for symptoms like audible air leaks or a drop in system pressure can indicate when a cylinder head needs replacement. Using high-strength components ensures the compressor continues to provide reliable service in demanding transport environments.

OE cross-reference

25 01 51 (Compressor Cylinder Head) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 2K97876MS2.