4089206 QSX15 Cylinder Head for Cummins Engines

What does a compressor cylinder head do?

This compressor cylinder head acts as the critical component that seals the top of the air brake compressor cylinder block. It provides the necessary seating for both inlet and discharge valves while ensuring that compressed air remains contained within the system without leaking. By routing air through the discharge port and managing thermal loads, it maintains consistent pneumatic pressure for the braking system.

Engine compatibility and fitment

This component is specifically designed for compatibility with Cummins engines, including the QSX15, ISX, QSB, ISC, L, M, ISB, and N series. It is engineered to meet the rigorous demands of heavy commercial vehicle applications, ensuring reliable operation under high-pressure cycles.

Maintenance and rebuilding

When performing maintenance or a rebuild, technicians should verify the specific compressor architecture to ensure correct fitment. This cylinder head is intended to facilitate in-place rebuilding of the compressor unit rather than requiring a full replacement of the entire assembly.

Selection guidance

Proper installation is essential to prevent pressure loss or internal leaks. Always check that valve seats are correctly aligned and that all seals are seated according to service requirements to maintain system integrity.

OE cross-reference

25 03 50 (Compressor Cylinder Head) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 4089206.