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3957725 S1 Cylinder Head Compatible with Cummins

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3957725 S1 Cylinder Head for Cummins Systems

25 11 50

Summary

This compressor cylinder head is a high-strength component designed to seal the compression chamber and house valve seats. It is compatible with Cummins systems to ensure reliable air output and temperature regulation in heavy commercial vehicle air brake compressors. Equivalent to OE Cummins 3957725S1.

Product identifiers
EAN Code8699031044569
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Compatible OEM Codes

  • CUMMINS
    • 4898367 S1
    • 4898083 S1
    • 3964688 S1
    • 3964687 S1
    • 3957725 S1
    • 3957724 S1
  • KNORR-BREMSE
    • LK3846 S1
    • LK3839 S1

Description

What does a cylinder head do?

This compressor cylinder head serves as the critical cast component that sits atop the air brake compressor cylinder block, sealing the compression chamber from above. It is designed to facilitate the rebuilding of compressors in place, providing an efficient alternative to replacing the entire unit. Within the head, the seats for the inlet and discharge valves are located, alongside internal air passages that govern both air output and running temperature.

Compatibility and fitment

This part is compatible with Cummins systems and is used in various heavy commercial vehicle engine configurations. The specific design ensures that the compression chamber remains sealed under high pressure, maintaining consistent air delivery for the braking system.

Maintenance and installation

When performing maintenance or troubleshooting air pressure issues, technicians should inspect the cylinder head for signs of wear or leaks around the valve seats. Ensuring a proper seal during installation is vital for maintaining optimal system pressure and preventing temperature spikes during operation.

Troubleshooting guidance

Check the compatibility list.

OE cross-reference

25 11 50 (Compressor Cylinder Head) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 3957725S1.

Other OEMs

CUMMINS

  • 4898367 S1
  • 4898083 S1
  • 3964688 S1
  • 3964687 S1
  • 3957725 S1
  • 3957724 S1

KNORR-BREMSE

  • LK3846 S1
  • LK3839 S1

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
CUMMINS
KNORR-BREMSE

FAQ

What is the function of a compressor cylinder head?
The cylinder head seals the compression chamber from above and houses the inlet and discharge valve seats, directly governing air output and operating temperature.
Can this part be used to rebuild an existing compressor?
Yes, this component allows a workshop technician to rebuild a compressor in place rather than requiring a full unit replacement.
How do I ensure compatibility with my compressor?
Selection should always be based on the specific compressor architecture and reference number, as different engine options may require different head designs.
What are common symptoms of a faulty cylinder head?
Inconsistent air output or abnormal running temperatures can indicate issues with the valve seats or internal air passages within the head.
What are the OE reference numbers of this part?
25 11 50 directly replaces Cummins OE number 3957725S1.