Precision Remanufacturing Backed by Real Testing
At Turbo Kings, every WABCO 9121120020 air compressor is rebuilt to exceed OEM reliability and performance expectations.
Manufactured by WABCO and installed on Volvo D11, D13, and Mack MP7 / MP8 engines from 2008 through 2020, this single-cylinder, water-cooled compressor became the standard for North American Volvo and Mack platforms under the EPA07, EPA10, and GHG17 emissions generations.
Built for heavy-duty air systems, the 9121120020 delivers roughly 15.5–16.0 CFM at 1250 RPM, providing stable air pressure for braking, suspension, and auxiliary systems across regional and long-haul trucks. Its robust cast-iron crankcase, aluminum head, and liquid-cooled architecture make it an efficient, long-service compressor when properly maintained — and a strong candidate for professional remanufacture.
At Turbo Kings, we go beyond resealing. Each core is fully stripped, measured, and precision-restored. Bearing journals are checked for taper, valve assemblies refaced, and pistons replaced or machined to exact compression balance. All bores, heads, and seat surfaces are reconditioned within factory tolerances to eliminate air loss and restore true volumetric output.
All air and coolant passages are ultrasonically cleaned, removing scale, rust, and oil-carbon residue that conventional washing can’t reach. This ensures unrestricted airflow, uniform cooling, and proper heat dissipation under continuous duty.
Every compressor is then bench-tested under simulated engine load, validating pressure build rate, oil carry-over, and cut-in/cut-out response before serialization and packaging. Nothing ships until it passes our OEM performance verification benchmarks.
What Makes a Turbo Kings Rebuild Different
OEM-Based Engineering – Built using genuine WABCO specifications for Mack MP7 / Volvo D11–D13 platforms.
In-House Flow & Pressure Testing – Simulated load testing confirms stable output and leak integrity.
Ultrasonic Cleaning Process – Air and coolant channels restored to factory cleanliness for optimal efficiency.
Precision Machining – Decks, heads, and valves resurfaced for perfect sealing and compression.
Pre-Lubricated & Ready to Install – Shipped sealed and oil-primed for immediate drop-in fitment.
Warranty Confidence – 12-month, unlimited-mileage coverage with serialized documentation.
Why Fleets and Owner-Operators Trust Turbo Kings
Turbo Kings compressors are trusted nationwide by fleets that demand verified, data-backed performance — not assumptions.
Each rebuild undergoes full functional validation, ensuring OEM airflow, durability, and oil control. Our ultrasonic cleaning and precision machining processes restore every unit to near-new internal cleanliness and compression consistency, reducing heat stress and extending lifespan in real fleet duty.
Our Process at a Glance
Disassembly & Cleaning – Full teardown, degrease, and media inspection.
Ultrasonic Passage Cleaning – Internal water and air passages cleared of scale and buildup.
Parts Replacement & Machining – Bearings, valves, and seals replaced with OEM-grade components.
Assembly & Torque Verification – Components precisely aligned and torqued to specification.
Flow & Pressure Testing – Bench-tested under simulated load for pressure stability and oil control.
Final Inspection & Documentation – Serialized and logged with test results and warranty data.
Standard Features
• Fully Flow- and Pressure-Tested
• Ultrasonically Cleaned Air & Coolant Passages
• Leak-Free and Output-Verified
• Pre-Lubricated and Sealed for Installation
• 12-Month Unlimited-Mileage Warranty
• Rapid Core Exchange Program
Applications
Compatible with:
Mack MP7 / MP8 (2008–2020)
Volvo D11 / D13 (2008–2020)
Found in VNL, VHD, Pinnacle, Granite, and other Class 8 Volvo/Mack models
OEM Reference: WABCO 9121120020 / 9125120020 / 9125130000
