When it comes to reliable performance in tough environments, few diesel engines match the reputation of the Cummins QSM11. Whether you’re in construction, mining, marine, or power generation, the QSM11 delivers the power, durability, and efficiency needed to keep your operations running smoothly.
The Cummins QSM11 is a powerful, mid-range diesel engine known for its reliability, efficiency, and versatility. With a displacement of 10.8 liters, it delivers strong performance across a wide range of applications—construction equipment, mining trucks, marine vessels, and power generation. This guide breaks down its key specs, core features, and typical uses, making it easier to decide if the QSM11 fits your needs for upgrades or replacement parts.
What Is the Cummins QSM11?
The QSM11 is a 6-cylinder, 10.8-liter diesel engine developed by Cummins Inc. It belongs to Cummins’ mid-range heavy-duty engine family and is designed for off-highway and industrial use. With power output ranging from 290 to 450 horsepower, it combines high torque with fuel efficiency and advanced electronic controls.
In short, the QSM11 is a versatile, electronically controlled engine built for demanding work environments.
Cummins QSM11 Technical Specifications
Here’s a breakdown of the key specifications of the QSM11 engine:
Specification Value
Engine Type 4-stroke, inline 6-cylinder
Displacement 10.8 liters (661 cubic inches)
Horsepower Range 290–450 HP
Peak Torque Up to 1550 lb-ft (2100 Nm)
Aspiration Turbocharged & Aftercooled
Fuel System High-pressure injection with electronic control
Emissions Standards Tier 3 / Tier 4i (depending on model)
ECM Cummins CM570 or CM870
Cooling System Water-cooled
These specs make the QSM11 powerful enough for heavy equipment, yet efficient enough for long-running industrial applications.
Core Features of the QSM11
The QSM11 is packed with engineering features that enhance both performance and reliability. Here are some of its most notable characteristics:
Electronic Fuel Control
The QSM11 features an advanced ECM (Electronic Control Module) that precisely manages fuel injection timing and engine parameters. This results in better fuel economy, lower emissions, and reduced operating costs.
Strong Build Quality
The engine block and components are designed for long life and minimal wear, even in high-load conditions. Many QSM11 engines run for thousands of hours with proper maintenance.
Versatility
Thanks to multiple configurations (such as QSM11-C for construction, QSM11-M for marine, and QSM11-G for generators), the QSM11 fits into a wide range of equipment.
Easy Diagnostics
With ECM integration, troubleshooting and diagnostics are more accurate and efficient, which helps reduce downtime and repair costs.
Common Applications of the QSM11
The QSM11 engine is widely used in several key industries:
Construction Equipment
- Wheel loaders
- Excavators
- Bulldozers
- Cranes
Mining Machinery
- Drilling rigs
- Haul trucks
- Underground loaders
Agricultural Machines
- Sprayers
- Tractors
- Harvesters
Marine Use (QSM11-M)
- Tugboats
- Fishing vessels
- Workboats
Industrial & Power Generation (QSM11-G)
- Standby power systems
- Mobile generator sets
- Pumps and compressors
Its high torque at low RPM makes it particularly well-suited for heavy load applications that require strong pulling power and reliability.
Popular QSM11 Replacement Parts
Regular maintenance is essential for long-term performance. Here are some commonly replaced parts for the QSM11:
- Fuel Injectors – 4903472, 4088661
- Turbochargers – 2881993, 3803939
- Water Pump Assembly – 4972853
- Engine Control Module (ECM) – CM570 / CM870
- Gasket Kits and Seals
- Crankshaft Sensors / Camshaft Sensors
- Oil Coolers and Filters
Using genuine or OEM-quality Cummins parts helps maximize performance and engine life.
Final Thoughts
The Cummins QSM11 is a tried-and-tested engine platform built for durability and performance. With its wide range of applications and proven design, it’s no surprise that it continues to be a favorite among equipment operators and fleet managers worldwide.
