CAT C13 239-4020 High-Pressure Turbocharger – Remanufactured by Turbo Kings

Precision Remanufacturing

This Turbo Kings remanufactured CAT C13 high-pressure turbocharger, built to replace part number 239-4020, restores OEM performance for the 2005–2007 C13 ACERT twin-turbo system. As the high-pressure (HP) unit in the sequential setup, this turbo is responsible for rapid low-RPM spool, stable boost initiation, and precise airflow modulation under load. Every Turbo Kings rebuild begins with a full teardown of the turbine housing, compressor housing, bearing housing, actuator bracket, and wastegate components. All parts undergo high-temperature alkaline processing and ultrasonic cleaning to remove carbon, oil residue, coolant scaling, and soot buildup typical of ACERT engines.

The HP unit belongs to the Garrett GTA4088 high-pressure family, a compact, fast-spooling architecture built for aggressive transient response. Because of its critical role, every sealing surface, wastegate pivot, scroll interface, and bearing location is measured digitally and restored to OEM geometry. Once housings pass dimensional verification, the CHRA is rebuilt with brand-new journal bearings, thrust components, seals, piston rings, hardware, and balancing parts. Turbo Kings assembles each center housing in a contamination-controlled environment to ensure clean lubrication flow paths and stable long-term operation.

Seal Integrity & Boost Control Stability

High-pressure turbos operate at extreme shaft speeds and see aggressive thermal cycles. For this reason, Turbo Kings places heavy emphasis on restoring sealing integrity and actuator consistency. All compressor and turbine sealing surfaces are resurfaced or replaced, including turbine ring lands, compressor O-ring seats, and thrust seal faces. Oil feed and return channels are cleaned, recut where necessary, and flow-verified to support the oil film required for stable shaft rotation at high RPM.

The HP wastegate actuator is calibrated to ensure the correct cracking pressure and smooth modulation. This ensures proper boost delivery through the entire low-to-mid-range RPM band, reducing lag and preventing over-boost conditions that can cause fault codes or derate. The turbine housing is inspected for erosion, warpage, and throat restriction, ensuring that exhaust energy is routed accurately into the turbine wheel.

What Makes Turbo Kings Different

Turbo Kings remanufactures with an engineering-first approach. Every C13 239-4020 HP turbo receives:

• High-speed VSR balancing of the rotating assembly

• New bearings, seals, and thrust hardware

• Restored wastegate movement and calibrated actuator settings

• Digitally measured and corrected mating surfaces

• Cleaned and verified oil circuits

• Precision-finished compressor and turbine interfaces

• Assembly torque-matched to OEM spec

• Pressure-tested housings and CHRA for sealing integrity

Unlike cosmetic rebuilders, Turbo Kings treats each HP turbo as a precision mechanical system that must meet the airflow and durability demands of ACERT engines.

Why Fleets and Owner-Operators Trust Turbo Kings

C13 ACERT engines rely on the HP turbo for fast low-RPM response, clean emissions behavior, and stable boost transition into the low-pressure turbo. A Turbo Kings reman unit restores:

• Rapid spool and throttle response

• Correct wastegate operation

• Stable boost modulation

• Proper exhaust energy management

• Improved drivability under load

• Long-term reliability through restored lubrication channels and balanced rotating groups

This makes Turbo Kings HP turbos ideal for fleets and operators who demand predictable uptime and performance.

Our Process at a Glance

• Complete disassembly and documentation

• Ultrasonic and chemical carbon removal

• Dimensional verification of all housings

• CHRA rebuild with new bearings, thrust parts, and seals

• High-speed shaft balancing

• Wastegate calibration and movement verification

• Pressure and flow testing

• Final inspection and serialization