QSK50 for Well Servicing (Tier 4 Final)


QSK50 for Well Servicing (Tier 4 Final)

Outwork. Outrun. Outperform.
In demanding oil and gas applications, dependability is everything. That’s where the superior uptime and productivity of the Tier 4 Final QSK50 make the difference. Its V16 configuration offers up to 2500 hp (1864 kW) – an excellent choice for tough fracing jobs.

The Cummins QSK50 for Tier 4 Final is built upon the reliable, dependable Tier 2 engine, with minimal base engine changes, giving the customer greater reliability and durability compared to other Tier 4 Final solutions.  Heat-rejection levels are similar to those of the Tier 2 engine as well, so there is no need to re-engineer the cooling package. Not only is the cooling package the same at Tier 2, but the Cummins QSK50 for Tier 4 Final drop-in design replaces the engine and muffler in your equipment, minimizing complexity and simplifying maintenance, and reduces noise on the job site.

The QSK50 for Tier 4 Final was built upon the proven Tier 2 platform, with some enhancements. Advanced combustion technology is applied to the QSK50, allowing the engine to run more efficiently. Coupled with the addition of improved crankcase breather, customers can expect an increase in 10% life to overhaul.

The Cummins SCR Exhaust Aftertreatment system allows the engine to run efficiently and generates low particulate, while increasing fuel efficiency over Tier 2. You can expect the same power and performance, in a cleaner, quieter package.


Engine Type 60° vee, 16-cylinder
Displacement 3,066.4 cu in 50.25 liters 
Bore and stroke 6.25 in x 6.25 in 159 mm x 159 mm
Oil system capacity 216 US qt 204 liters
Coolant capacity 180 US qt 170 liters


Aftercooled and Intercooled
Length 112 in (2,844.8 mm) 105 in (2,667 mm)
Width 61 in (1,549.4 mm) 

73 (1,854.2 mm)

Height 71 (1,803.4 mm)  74 in (1,879.6 mm)
Dry Weight 13,822 lb (6,270 kg) 

12,698 lb (5,760 kg)

Wet Weight 14,808 lb (6,717 kg) 

13,590 lb (6,164 kg)

Product Finder Specifications

Certification Level Tier 4 Final / Stage IV
Power 2250 - 2500 hp / 1678 - 1864 kW
Torque 6299 - 7080 lb-ft / 8540 - 9599 N•m


Advertised Power hp (kW) Peak Torque lb-ft (Nm) Turbo Arrangement
2500 (1864) @ 1900 rpm 7080 (9599) @ 1500 rpm Two Stage
2300 (1715) @ 1900 rpm 6514 (8832) @ 1500 rpm Two Stage
2250 (1678) @ 1900 rpm 6300 (8542) @ 1500 rpm Two Stage


Base engine – Redesigned power cylinder, optimized turbomachinery and improved crankcase breather system provide low PM generation while maintaining durability and reliability. The QSK50 provides 1 million gallons of fuel to overhaul.

Fuel system – The more efficient Cummins modular common-rail fuel system features increased injection pressure and larger injector accumulator volume for reduced particulate emissions and improved fuel economy. The leakless injector features increased fueling precision and timing control, for reduced parasitic losses, reduced fuel heating and improved fuel economy, Cummins NanoNet™ filtration protects the fuel pump and injectors by capturing and retaining more harmful particles than traditional media for long life and reliability.

Selective Catalytic Reduction (SCR) – Cummins modular SCR design, featuring an integrated decomposition chamber and Cummins airless Diesel Exhaust Fluid (DEF) dosing system, is designed to last the life of the engine. Simple and durable, Cummins SCR catalyst provides additional PM reduction and low back pressure for enhanced fuel economy. Proven in many markets with billions of hours of reliable, robust operation around the world.

Fleetguard® Fuel Filters, Lube Filters and DEF from Cummins Filtration – Fleetguard filters protect against corrosion and contaminants that can cause performance issues. High quality DEF is widely available at authorized Cummins and Fleetguard locations, as well as in bulk delivery.

Brochures Available

Title Bulletin Number Request View  
Cummins Power For Well Servicing Brochure 4087355 View  Download
DEF (Diesel Exhaust Fluid) Brochure - A Better Solution. Every Time. 4087312 Request View  Download
Diesel Exhaust Fluid For QSK19-QSK95 Tier 4 Final/Stage IV (800-4400 HP) Mining And Oil And Gas Engines Brochure 4087383 Request View  Download
Modular Common Rail Fuel System (MCRS) Overview Flyer 4087371 Request View  Download
SCR For High-Horsepower Tier 4 Final Engines Spec Sheet 4087389 Request View  Download
Tier 4 Final High-Horsepower Engines For Oil And Gas Brochure 4087305 Request View  Download