QSB3.9 -Range | 80-210HP
The Cummins QSB3.9 is a reliable and fuel-efficient 4-cylinder diesel engine from the Dongfeng Cummins Joint Venture (DCEC). Delivering 80-210 hp, it features advanced electronic controls, a high-pressure fuel system, and turbocharged aftercooling for strong performance and low emissions. Widely used in heavy equipment, it offers high efficiency and durability.
Product Introduction
Key Features
Durable Cylinder Liner Technology
Platform-honing surface treatment extends liner life, improves sealing, and resists wear under high-load duty cycles.
Engineered by Cummins, Built by DCEC (Since 1986)
Fully licensed by Cummins USA, maintaining Cummins quality standards in every component.
Mechanical Fuel System (Weifu PW / RSV)
No electronics, fewer failures, and easier maintenance — especially in remote or low-infrastructure regions.
High Thermal Efficiency
Advanced combustion chamber and intercooler reduce fuel consumption and emissions while maintaining torque output.
Holset Turbo with Wastegate
Delivers consistent boost pressure across altitude and load changes, improving engine response under variable conditions.
Technical Specifications
| Specification | Detail |
| Configuration | In-line 4-cylinder |
| Displacement | 3.9 Liters |
| Bore x Stroke | 102 x 120 mm |
| Compression Ratio | 16.5:1 |
| Fuel System | Weifu PW/RSV mechanical pump |
| Aspiration | Turbocharged & Inter-cooled |
| Rated Output | 75–130 HP (varies by config) |
| Emission Level | Tier 2 / Tier 3 |
| Manufacturing Base | Dongfeng Cummins (China) |
| Compatibility | Fully replaceable with 4BT3.9 |
Detailed drawings, 3D CAD files, and mounting diagrams available upon request.tion in Asia, Africa, and Latin America.”
General Information
3.9 Cummins Engine Model
| Engine model | power （kw/rpm) | Weight(kg) | Size(mm) |
| QSB3.9-C80-30 | 60@2000 | 331 | 980×850×950 |
| QSB3.9-C100-31 | 74@2400 | 331 | 980×850×950 |
| QSB3.9-C125-30 | 93@2200 | 331 | 980×850×950 |
| QSB3.9-C130-30 | 97@2300 | 331 | 980×850×950 |
| QSB3.9-P80 | 36@2900 | 331 | 980×850×950 |
| QSB3.9-P110 | 60@2900 | 331 | 980×850×950 |
| QSB3.9-P115 | 85@2900 | 331 | 980×850×950 |
| QSB3.9-G3 | 79@1500 | 331 | 980×850×950 |
| QSB3.9-G2 | 63@1500 | 331 | 980×850×950 |
Applications
The QSB 3.9 engine is widely used in both mobile and stationary equipment, offering unmatched versatility in:
| Sector | Equipment Types |
| Construction | Excavators, road rollers, graders |
| Agriculture | Sprayers, irrigation pumps |
| Power Generation | Diesel generators, pump skids |
| Mining & Earthwork | Drills, small loaders, site machines |
| Lifting Systems | Cranes, hoists, material handlers |
“Field-proven in over 70 countries. Thousands of units in operation in Asia, Africa, and Latin America.”
Support & Services by JOZ
As a Cummins-authorized partner, JOZ offers full-engine solutions beyond the product:
- Genuine Cummins Parts – Filters, overhaul kits, sensors, injectors
- Global Export – Engine crating, customs paperwork, certification support
- Installation Engineering – Remote & on-site support for integration
- Fleet Solutions – Core swap programs, scheduled maintenance kits
- Emergency Breakdown Help – Fast shipping + field engineer dispatch
