Details
Cummins QSM11-350 Engine Assembly: 350HP Heavy-Duty Power
Finding a reliable replacement for heavy equipment requires an engine that balances raw power with precise electronic control. The Cummins QSM11-350 is a 10.8L, inline 6-cylinder industrial diesel engine engineered specifically for extreme earthmoving and construction environments. Delivering a rated output of 261kW (350HP) at 2100 RPM, this XCEC-manufactured powerhouse provides the durability fleet operators demand.
As a leading Cummins QSM11-350 engine supplier in China, HekoPower provides both complete engine assemblies and genuine spare parts. Whether you are repowering an aging fleet or dealing with a catastrophic engine failure, sourcing a genuine QSM11-350 engine assembly minimizes downtime and restores factory-level performance to your heavy machinery.
Tech Specs of XCEC QSM11-350
General Engine Data
Engine Model: Cummins QSM11-350
Type: 6 Cylinders in Line
Displacement: 10.8 L
Bore * Stroke: 125 * 147
Overall Dimension: 1306mm*914mm*1280mm
Net Weight (with flywheel & alternator): 984 Kg
Key Performance Data
Rated Power: 261 kW/350HP
Rated Speed: 2100/2000 rpm
Max Torque/Speed(2100 RPM): 1776 N.m @ 1400 rpm
Max Torque/Speed(2000 RPM): 1830 N.m @1400 rpm
Fuel Consumption @ Rated Power: 217 g/Kw.h
More Technical Data
Certification: Tier III
Aspiration: Turbocharged & Charge Air Cooled
Fuel System: Common Rail High Pressure Injection
Compression Ratio: 16.3:1
Electrical System (Starter Motor/Alternator): 12V/24V
Lowest Starting Temp Without auxiliary system: -12℃/-25℃
Cooling Method: Water cooled
Engine Cooling Fluid Volume: 9.5 L
Control System: Full Electronic Control System(ECM)
Real-World Application Scenarios
The QSM11-350 industrial diesel engine is not a generic power plant. It is specifically calibrated for the harsh, high-load conditions of off-highway work. Its robust block design and 1830 Nm torque curve make it the ideal Cummins QSM11-350 replacement engine for several key industries.
Earthmoving and Construction Equipment
Excavators and bulldozers experience rapid fluctuations in hydraulic demand. When an operator digs into hardpan soil, the engine must respond instantly to prevent stalling. The QSM11-350 engine for excavators utilizes an advanced electronic fuel system to maintain RPM under heavy hydraulic loads. Similarly, the QSM11-350 engine for wheel loaders provides the low-end torque necessary for breakout force and aggressive stockpiling operations.
Mining and Road Construction Machinery
In mining environments, dust and continuous high-load cycles destroy inferior engines. The QSM11-350 diesel engine for mining machinery features heavy-duty filtration compatibility and a highly efficient charge air cooled system to maintain safe operating temperatures deep in the pit. For road construction equipment, such as large asphalt millers and drilling rigs, the consistent 350HP output ensures continuous operation without power fade during long shifts.
Technical Comparisons: Understanding the QSM11 Lineup
To make an informed purchasing decision, buyers often need to understand how the QSM11-350 compares to legacy models and similar engines in the M-Series family.
QSM11-350 vs M11-C350
Many fleet managers look for a QSM11-350 replacement for M11-C350 engines. The primary difference lies in the fuel injection system and emissions compliance. The older M11-C350 relied on a mechanical PT fuel system, which was incredibly durable but lacked precise emission controls. The QSM11-350 upgrades this with a sophisticated electronic control module (ECM). This ECM control governs the fuel injection system digitally, optimizing the air-to-fuel ratio in real-time. This allows the QSM11 to achieve Tier III engine emission standards while delivering better rated fuel consumption than its mechanical predecessor. Upgrading from an M11 to a QSM11-350 drastically improves fuel economy and cold-starting reliability.
QSM11-350 vs QSM11-300
When comparing the QSM11-350 vs QSM11-300 horsepower and torque, the choice comes down to the specific weight and load of the equipment. The QSM11-300 is tuned for lighter industrial applications. However, if you are operating a large 40-ton excavator, the QSM11-300 will struggle under peak hydraulic demand. The QSM11-350 provides that critical extra 50 horsepower and a steeper torque curve, preventing engine lugging and extending the overall lifespan of the power unit.
Common Misconceptions About the QSM11-350
There is a persistent myth that the QSM11 electronic fuel system is too fragile for rugged construction sites compared to older mechanical engines. This is entirely false. The QSM11 ECM is heavily insulated against vibration, moisture, and extreme temperatures.
Another misconception revolves around the QSM11-350 engine replacement cost. While buying a brand-new genuine Cummins QSM11 assembly requires an upfront investment, it is often more cost-effective than attempting a piecemeal overhaul of a severely damaged block. A complete drop-in replacement engine eliminates the hidden labor costs of rebuilding and guarantees that every internal component—from the QSM11-350 cylinder head to the water pump—is factory new.
Maintenance and Replacement Tips
Maximizing the lifespan of your 10.8L Cummins QSM11 requires strict adherence to its service intervals and an understanding of its unique architecture.
Routine Service Intervals
The QSM11-350 maintenance requirements dictate precise oil and filter changes based on hours of operation. Because this is a turbocharged, charge air cooled engine, intake air quality is critical. Inspect the charge air cooler for leaks regularly, as a boost leak will cause the ECM to over-fuel the engine, leading to excessive exhaust heat and potential turbocharger failure.
Sourcing QSM11-350 Replacement Parts
During a standard engine overhaul, using genuine components is non-negotiable. HekoPower supplies all critical QSM11-350 spare parts, including the common rail fuel system components. The most frequently requested maintenance items include the QSM11-350 injector sets, the electronic fuel pump, and the QSM11-350 water pump kit. If your engine has suffered critical wear, we also supply complete overhaul kits designed specifically for the 125mm bore and 147mm stroke configuration of this block.
Troubleshooting the Electronic Control System
When experiencing power loss, fleet mechanics should immediately check the QSM11-350 electronic control system via the diagnostic port. The ECM will log fault codes for issues ranging from low fuel pressure to sensor failures. Always consult the official QSM11-350 service manual before replacing electronic sensors, as wiring harness degradation is sometimes the true culprit behind a fault code.
The Cummins M-Series Industrial Power Lineup
While the QSM11-350 offers an excellent balance of 261kW power and Tier III efficiency for heavy equipment, we understand that different machinery requires different horsepower ratings. The M-series engine family is highly versatile, offering various tuning profiles to match your specific hydraulic and drivetrain requirements. To explore other power outputs within this same trusted 10.8L displacement platform, please see the related models below.
Cummins QSM11-Construction Diesel Engine Series, original products from Xi’an Cummins Joint Venture Plant (XCEC), since 1986, 50% owned by Cummins USA, under Cummins Technical & Product Line. This series mainly includes QSM11-290, QSM11-300, QSM11-335, QSM11-350, QSM11-360, QSM11-375, QSM11-400.
Frequently Asked Questions
What is the standard QSM11-350 engine lead time?
As an established QSM11-350 engine export supplier, HekoPower typically maintains a robust inventory. For in-stock units, lead times are minimal. Factory orders for specific heavy equipment configurations may take longer. Contact our sales team for exact shipping timelines to your global location.
Can I buy a QSM11-350 replacement engine directly from China?
Yes. HekoPower operates as a direct Cummins QSM11-350 exporter and wholesale supplier. We handle all logistics required to ship a complete engine assembly safely to your port of choice, ensuring you receive a genuine product at competitive QSM11-350 wholesale prices.
What is the exact QSM11-350 engine weight and dimensions?
The dry weight of the standard QSM11-350 industrial engine is approximately 984 kg (2,169 lbs), though this can vary slightly depending on the specific flywheel housing, oil pan depth, and accessory drives required for your specific equipment. The compact engine dimensions allow it to fit seamlessly into the engine bays of major earthmoving brands.
Does the QSM11-350 come with the ECM and wiring harness?
When you purchase a new Cummins QSM11-350 complete engine assembly from us, it comes fully dressed. This includes the electronic control module, full engine wiring harness, fuel system, turbocharger, and cooling components, making it a true drop-in replacement for your construction machinery.
