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3964687 S1 Cylinder Head for Cummins Air Brake Compressors

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3964687 S1 Cummins compatible Cylinder Head

25 11 50

Summary

This compressor cylinder head is a high-strength component designed for air brake compressor systems. It serves as the critical seal for the compression chamber, ensuring efficient air output and temperature regulation in heavy commercial vehicle applications. Compatible with Cummins systems. Equivalent to OE Cummins 3964687S1.

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 acts as the cast service component that sits on top of an air brake compressor's cylinder block, sealing the compression chamber from above. It is designed to allow workshop technicians to rebuild a compressor in place rather than replacing the entire unit, making it a vital component for efficient maintenance.

Compatibility and application

This part is compatible with Cummins systems and is used in heavy commercial vehicle air brake systems. It functions by housing the seats for the inlet and discharge valves, internal air passages, and cooling cavities, which directly governs both the air output and the running temperature of the unit.

Installation and maintenance

When performing maintenance, technicians should inspect the valve seats and sealing surfaces during installation. Proper torque application is essential to ensure a stable seal against the cylinder block and to prevent air leaks within the compression chamber.

Troubleshooting and selection

Choosing the correct cylinder head is critical for maintaining optimal air pressure levels and preventing overheating during sustained high-load operations.

OE cross-reference

25 11 50 (Compressor Cylinder Head) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 3964687S1.

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/discharge valve seats, internal air passages, and cooling cavities.
Can this part be used to rebuild an existing compressor?
Yes, this component allows workshop technicians to rebuild a compressor in place instead of replacing the entire unit.
What should be checked during installation?
Technicians should verify valve seat integrity and ensure proper torque to maintain a seal against the cylinder block.
How does this part affect compressor performance?
It directly governs both the air output capacity and the running temperature of the air brake compressor system.
What are the OE reference numbers of this part?
25 11 50 directly replaces Cummins OE number 3964687S1.