4936226 Cylinder Head for Cummins ISM Engines

What does a compressor cylinder head do?

This cylinder head acts as the primary sealing component for the air brake compressor cylinder block, closing off the compression chamber from above. It is a vital service part that allows workshop technicians to rebuild a compressor in place, avoiding the need for a complete unit replacement. By housing the inlet and discharge valve seats and internal air passages, it directly governs the air output and operating temperature of the system.

Engine compatibility and fitment

This specific component is compatible with Cummins engines, including the ISM, QSM11, ISB6.7, ISC8.3, QSB6.7, N14, ISL, QSC8.3, QSL9, and M11 series. It is engineered to meet the rigorous demands of heavy commercial vehicle braking systems.

Installation and maintenance guidance

When replacing this component, technicians should inspect the cylinder block surface and ensure all valve seats are properly aligned. Proper installation ensures stable compression and prevents leaks in the pneumatic circuit. Consult your authorized distributor for fitment verification.

System reliability and maintenance

Maintaining the integrity of the cylinder head is crucial for preventing pressure drops in the air brake system. Regular inspection of the head and its seating surfaces can prevent premature wear of other compressor components.

OE cross-reference

25 03 10 (Compressor Cylinder Head) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 4936226.