4089206 ISC Compressor Cylinder Head

What does a compressor cylinder head do?

This cylinder head is the cast service component that sits on top of an air brake compressor's cylinder block and seals the compression chamber from above. It is engineered to allow workshop technicians to rebuild a compressor in place, providing a cost-effective alternative to replacing the entire unit. This part directly governs both the compressor's air output and its running temperature by housing the inlet and discharge valve seats.

Engine compatibility

This component is compatible with Cummins ISC engines. It is specifically designed to fit within the pneumatic architecture required for heavy commercial vehicle air systems, ensuring reliable performance under high-pressure conditions.

Installation and maintenance

When performing maintenance, technicians should inspect the valve seats and internal air passages for any signs of wear or carbon buildup. Proper installation ensures that the compression chamber remains airtight, preventing pressure drops in the braking system. Check the compatibility list to ensure correct fitment for your specific engine series.

Troubleshooting guidance

Monitoring the cylinder head for leaks or excessive heat can prevent larger system failures. If air output becomes inconsistent, it may indicate that the head or its internal valve components require service.

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.