Detroit Diesel DD15 | Fixed Geometry (With Bearings)

Precision Remanufacturing

This Turbo Kings remanufactured turbocharger is engineered specifically for the Detroit Diesel DD15 fixed-geometry turbo platform and corresponds to OE part number A4720901880. This configuration features the full bearing-housing CHRA (“with bearings”), a robust design commonly used in applications requiring consistent boost output, stable exhaust flow, and long-term durability under sustained load.

Each Turbo Kings unit begins with a complete teardown and documentation process. All components—including turbine housings, compressor covers, bearing housings, and oil-lubrication passages—undergo hot alkaline immersion, ultrasonic carbon removal, and abrasive surface conditioning to eliminate deposits, varnish, soot, and corrosion. Dimensional metrology is then used to verify that every housing meets OEM geometry before reassembly begins.

The CHRA is fully rebuilt with brand-new journal bearings, thrust bearings, seals, piston rings, hardware, and balancing components. Oil passages are recut and flow-verified, thrust surfaces are refinished, and sealing interfaces are restored to ensure proper oil control and long service life. Rotating components are matched and balanced to exact tolerances, restoring factory-level spool response and vibration characteristics.

Seal Integrity and Flow Efficiency

The DD15’s fixed-geometry design depends heavily on precise seal integrity and turbine efficiency to maintain emissions compliance and torque output. Turbo Kings restores every sealing surface, ensuring that both compressor and turbine housings interface with the CHRA without leak paths or air-loss points. Bearing clearances are calibrated to support correct oil film thickness at high RPM, reducing friction, wear, and thermal loading.

Because this unit uses the DD15’s robust full-bearing center housing, Turbo Kings focuses on restoring the bearing cavity geometry to prevent oil intrusion into the exhaust or compressor stream. The turbine wheel, compressor wheel, and shaft assembly are balanced as a complete set using state-calibrated VSR equipment, delivering OE-level smoothness and boost stability.

What Makes Turbo Kings Different

Turbo Kings remanufacturing goes beyond simple cleaning and component replacement. Each DD15 bearing-housing turbo is processed with:

• High-speed VSR balancing of the rotating assembly

• New bearings, seals, and thrust components installed in every CHRA

• Digitally measured housing restoration to OEM specification

• Oil-flow verification of the bearing housing and lubrication circuits

• Compressor and turbine surface conditioning for optimum efficiency

• CHRA assembly in a contamination-controlled environment

• Full boost and pressure testing to confirm sealing performance

This ensures consistent, predictable performance under fleet, regional haul, port, and heavy-duty applications.

Why Fleets and Owner-Operators Trust Turbo Kings

A restored DD15 fixed-geometry turbocharger from Turbo Kings provides the same performance and reliability expected from OE units, including:

• Stable boost output for loaded acceleration

• Improved fuel efficiency through optimized airflow

• Correct exhaust pressure behavior supporting EGR and aftertreatment

• Long-term reliability under continuous high-load operation

• Reduced fault codes related to airflow imbalance or boost deviation

Every unit is serialized, pressure-tested, and verified to meet OEM functionality before shipping.

Our Process at a Glance

• Full teardown and inspection

• Hot-tank, chemical, and ultrasonic cleaning

• Dimensional verification of all housings

• CHRA rebuild with new bearings and thrust components

• High-speed VSR balancing

• Compressor/turbine pressure testing

• Final inspection and serialization