Cummins ISM S-21433 Remanufactured Air Compressor
Precision Remanufacturing
The Cummins ISM S-21433 remanufactured air compressor is rebuilt by Turbo Kings using a strict, component-level remanufacturing process designed to restore OE-level performance and long-term reliability. Each core is completely disassembled and inspected to identify wear on critical components including the crankshaft journals, piston assembly, cylinder bore, valve plate, and sealing surfaces. Any component that does not meet OEM dimensional tolerances is replaced rather than reused.
The compressor housing and internal air passages are thoroughly cleaned using an alkaline process to remove carbon buildup, oil residue, and debris that can restrict airflow or cause premature valve failure. Cylinder bores are refinished as required to ensure proper ring seating and consistent compression. The piston assembly is rebuilt with new rings and wear components to maintain correct oil control and compression balance. All gaskets, seals, and O-rings are replaced with high-temperature materials to eliminate air and oil leakage under sustained operating conditions.
Air System Reliability & Flow Performance
Designed for Cummins ISM applications, the S-21433 compressor is built to support consistent air delivery for braking, suspension, and auxiliary pneumatic systems. Turbo Kings focuses on restoring proper valve response time and discharge efficiency, which are critical for maintaining stable system pressure and preventing excessive compressor cycling. Valve plates and sealing surfaces are restored to ensure reliable pressure retention and smooth operation across a wide RPM range.
Oil management is carefully addressed during the remanufacturing process. Internal oil passages are cleaned and inspected to maintain correct lubrication of moving components while minimizing oil carryover into the air system. This helps protect downstream components such as air dryers, brake valves, and air tanks, extending overall system life and reducing maintenance intervals.
What Makes Turbo Kings Different
Turbo Kings remanufactures air compressors with an emphasis on durability, consistency, and real-world operating conditions. Each Cummins ISM S-21433 unit receives:
Complete teardown and dimensional inspection
Replacement of worn internal components, not cosmetic resealing
Precision cleaning of all air and oil passages
Restoration of valve and sealing surfaces
Reassembly using calibrated torque specifications
Functional bench testing to verify output and sealing integrity
This approach ensures the compressor performs reliably in both line-haul and vocational applications.
Our Process at a Glance
Core disassembly and initial inspection
Alkaline cleaning of housings and internal passages
Machining and surface restoration where required
Installation of new seals, gaskets, and wear components
Controlled reassembly to OEM specifications
Bench testing for pressure output and leakage
Final inspection prior to shipment
Why Fleets and Owner-Operators Trust Turbo Kings
Turbo Kings compressors are built to reduce downtime and restore confidence in critical air systems. The Cummins ISM S-21433 remanufactured air compressor is engineered to deliver dependable performance, consistent pressure recovery, and long service life. Whether supporting a single truck or an entire fleet, this unit provides a cost-effective solution without compromising reliability or build quality.
Cross-Reference Numbers
9122180300, 9122180301, 9122180305, 9122180302, 2125159, 3923403, 504109972
