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LP3940 S1 Knorr-Bremse compatible Compressor Cylinder Head

12 11 50

Summary

This compressor cylinder head is a high-strength component designed for air brake compressor rebuilds. It is compatible with Knorr-Bremse systems, serving as a critical sealing component to maintain compression chamber integrity and regulate thermal performance during heavy-duty operation. Equivalent to OE Knorr-Bremse LP3940S1.

Product identifiers
EAN Code8699031021188
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Compatible OEM Codes

  • KNORR-BREMSE
    • LP3943 S1
    • LP3940 S1
    • LP3934 S1
    • LP3928 S1
    • LP3830 S1
    • LK3832 S1
    • LK3826 S1
    • LK3809 S1
    • LK3808 S1
    • LK3806 S1
    • LK3805 S1
    • LK3802 S1
  • MAN
    • 51.54101-7204 S1
    • 51.54101-7201 S1
    • 51.54101-7195 S1
    • 51.54101-7189 S1
    • 51.54101-7150 S1

Description

A compressor 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.

This component is essential for workshop technicians looking to rebuild a compressor in place rather than replacing the entire unit. It houses the seats for the inlet and discharge valves, the internal air passages, and the cooling cavities. By managing these elements, the head directly governs both the air output and the running temperature of the compressor.

This part is designed to be compatible with Knorr-Bremse systems. It serves as a reliable replacement for maintaining optimal pneumatic performance in heavy commercial vehicle air brake systems.

When performing a rebuild, ensure all seals are inspected to maintain proper pressure. Consulting your authorized distributor can help confirm exact fitment requirements for specific compressor architectures.

OE cross-reference

12 11 50 (Compressor Cylinder Head) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number LP3940S1.

Other OEMs

KNORR-BREMSE

  • LP3943 S1
  • LP3940 S1
  • LP3934 S1
  • LP3928 S1
  • LP3830 S1
  • LK3832 S1
  • LK3826 S1
  • LK3809 S1
  • LK3808 S1
  • LK3806 S1
  • LK3805 S1
  • LK3802 S1

MAN

  • 51541017204S1
  • 51541017201S1
  • 51541017195S1
  • 51541017189S1
  • 51541017150S1
  • 51.54101-7204 S1
  • 51.54101-7201 S1
  • 51.54101-7195 S1
  • 51.54101-7189 S1
  • 51.54101-7150 S1

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
KNORR-BREMSE
MAN

FAQ

What is the function of a compressor cylinder head?
It seals the compression chamber from above and houses the inlet and discharge valve seats, directly affecting air output and temperature regulation.
Can this part be used to rebuild an existing compressor?
Yes, this component allows workshop technicians to rebuild a compressor in place, providing a more cost-effective alternative to full unit replacement.
Is this component compatible with Knorr-Bremse systems?
This part is designed to be compatible with Knorr-Bremse systems used in heavy commercial vehicle air brake setups.
What symptoms indicate a faulty cylinder head?
Potential issues include decreased air output, unusual operating temperatures, or visible leaks around the cylinder block interface.
What are the OE reference numbers of this part?
12 11 50 directly replaces Knorr-Bremse OE number LP3940S1.