11 30 20 Cylinder Head for Mercedes-Benz Engines

What does a compressor cylinder head do?

This compressor cylinder head serves as the essential cast component that seals the top of an air brake compressor's cylinder block. By housing the inlet and discharge valve seats, it manages the compression chamber to prevent air leakage while routing compressed air through the discharge port. This component is critical for maintaining stable air pressure within the pneumatic braking system of heavy commercial vehicles.

Compatible vehicles and engines

This specific cylinder head is engineered for compatibility with Mercedes-Benz Citaro (O 530) models including Citaro LÜ, MUE, N, GN3, and G, as well as Setra Series 400 MultiClass variants. It is designed to work seamlessly with OM 457 LA, OM 457 HLA, and OM 447 HLA engines found in Mercedes-Benz CONECTO and CAPACITY units. This part allows workshop technicians to rebuild compressors in place, providing a cost-effective alternative to full unit replacement.

Installation and maintenance

When performing installation, technicians should inspect the cylinder block surface and valve seats to ensure a perfect seal. Proper torque application is vital to prevent leaks in the compression chamber. Given the high-pressure environment, checking the integrity of the mounting surface during every replacement interval helps maintain long-term pneumatic system reliability.

System reliability and heat management

Maintaining consistent air output requires a cylinder head that can withstand extreme thermal cycles. This component helps manage compression heat through its internal design, ensuring the air brake system remains responsive under heavy loads. Consult your authorized distributor to check the compatibility list.

OE cross-reference

11 30 20 (Compressor Cylinder Head) is the equivalent of the Mercedes-Benz and WABCO OE numbers. This part directly replaces Mercedes-Benz OE number 0011305715. It also replaces WABCO OE number 9125109252.