The QSB series is one of Cummins’ most popular mid-range diesel engine lines, widely used in construction, agriculture, marine, and industrial equipment. Known for their high performance, fuel efficiency, and reliability, the QSB4.5 and QSB6.7 engines are especially sought-after for both OEM and replacement markets.
Key Models: QSB4.5 and QSB6.7
QSB4.5 Engine
- Displacement: 4.5 liters
- Power Range: 110–160 HP
- Applications: Compact excavators, skid steers, tractors, small generators
- Features: Common Rail fuel system, compact design, low emissions (Tier 3 / Tier 4 compliant)
QSB6.7 Engine
- Displacement: 6.7 liters
- Power Range: 150–300 HP
- Applications: Wheel loaders, bulldozers, marine engines, industrial power units
- Features: Advanced ECM, high-pressure injection, low noise, high torque
Why Choose a QSB Engine?
Proven Durability
Cummins QSB engines are built with robust components, making them ideal for heavy-duty and off-road environments.
Fuel Efficiency
With electronic control and efficient combustion, QSB engines save fuel without sacrificing performance.
Easy Maintenance
Parts are widely available, and the engines are designed for quick servicing, reducing downtime.
Low Emissions
Compliance with EPA Tier 3/Tier 4 and EU Stage IV standards means you meet regulations and help the environment.
Common QSB Series Engine Parts
When servicing your QSB4.5 or QSB6.7 engine, here are some commonly replaced parts:
- Топливные форсунки
- Water Pump (e.g. part #3803281)
- Turbocharger
- Fuel Transfer Pump
- Cylinder Head Gasket
- Crankshaft and Camshaft
- Oil Filters and Air Filters
Looking for genuine or OEM QSB engine parts? Make sure you check part numbers and engine serial numbers (ESN) before ordering.
Applications Across Industries
- Construction: Excavators, backhoes, wheel loaders
- Agriculture: Tractors, harvesters
- Marine: Inboard propulsion, auxiliary power
- Mining: Underground loaders, utility trucks
- Power Generation: Diesel generators and mobile power stations
How to Identify Your QSB Engine
Every Cummins QSB engine comes with a data plate listing the Engine Serial Number (ESN), model, and configuration. Use this ESN to find accurate parts and technical support.
Where to Buy QSB Series Engines and Parts
Whether you’re looking for a complete QSB6.7 engine assembly, a rebuild kit, or specific engine accessories, choose a trusted supplier that offers:
- Competitive prices
- Fast shipping
- Technical support
- Verified compatibility
We specialize in Cummins engine parts, including QSB4.5 / QSB6.7 models. Contact us for quotes or bulk orders.
Conclusion
The Cummins QSB series is a proven choice for professionals needing reliable diesel power. With a balance of performance, durability, and support, the QSB4.5 and QSB6.7 engines continue to power machinery worldwide.
