Description

The Cummins QSB6.7 355 HP Marine Diesel Engine is a high-performance, fuel-efficient, and durable engine designed for medium to large-sized vessels. Offering 355 horsepower (HP), this engine is ideally suited for a wide range of marine applications, including recreational boats, commercial vessels, and workboats. With advanced technology, enhanced fuel efficiency, and compliance with modern emissions standards, the QSB6.7 engine is a top choice for boat owners and operators seeking reliable and powerful marine propulsion.

Key Features and Specifications:

1. Power Output:
   • Rated Power: 355 horsepower (HP) at 2,800 RPM (revolutions per minute).
   • The 355 HP output ensures high performance, making the QSB6.7 perfect for vessels requiring reliable, continuous power, whether for propulsion or auxiliary systems.
2. Displacement and Configuration:
   • Engine Configuration: 6-cylinder in-line engine.
   • Displacement: 6.7 liters (409 cubic inches).
   • The 6-cylinder configuration offers smooth operation, increased power output, and optimal fuel efficiency, making it a reliable choice for various marine applications.
3. Fuel System:
   • The QSB6.7 is equipped with a Common Rail Fuel System (CRS), providing precise and efficient fuel injection for better performance, smoother operation, and reduced emissions.
   • Fuel Type: Diesel fuel, offering higher energy density and efficiency compared to gasoline, especially during extended use and long-distance operations.
4. Turbocharging and Intercooling:
   • The engine comes equipped with a Turbocharger and Intercooler, which boosts the air intake to improve combustion efficiency. This allows the engine to produce higher power outputs while maintaining fuel efficiency and reducing exhaust temperatures.
5. Cooling System:
   • The QSB6.7 utilizes a freshwater-based cooling system with a heat exchanger and a seawater cooling circuit. This ensures optimal engine temperatures during extended use and reduces the risk of overheating, even in harsh marine environments.
6. Emissions Compliance:
   • The QSB6.7 is designed to meet EPA Tier 3 and IMO Tier II emissions standards, making it a more environmentally friendly choice. The engine meets stringent emissions requirements without sacrificing power or fuel efficiency, making it suitable for a wide range of global marine applications.
7. Size and Weight:
   • Length: Approximately 1,300 mm (51.2 inches).
   • Width: Approximately 800 mm (31.5 inches).
   • Height: Approximately 1,100 mm (43.3 inches).
   • Dry Weight: Around 850 kg (1,874 lbs).
   • The QSB6.7’s compact and balanced design ensures easy installation in a variety of marine vessels, without compromising space or vessel stability.
8. Transmission Compatibility:
   • The engine is compatible with a variety of marine transmissions, making it adaptable to different propulsion configurations, whether in direct-drive, gear reduction, or other systems. This flexibility allows for easy integration into a wide range of vessels.
9. Durability and Maintenance:
   • Cummins engines are known for their durability, and the QSB6.7 is no exception. It is built with high-quality materials to withstand the harsh conditions of marine environments. The engine also features easy access to maintenance points, reducing downtime and simplifying service and maintenance procedures.
   • Maintenance: The engine is equipped with Cummins’ innovative fleetguard filtration systems to reduce the wear and tear on critical components, which helps extend the engine’s service life and reduce the frequency of oil changes.
10. Applications:
    • The Cummins QSB6.7 355 HP Marine Diesel Engine is versatile and can be used in a variety of marine applications, including:
      • Recreational vessels (such as yachts, cruisers, and sportfishing boats).
      • Commercial workboats (like tugs, ferries, and offshore supply vessels).
      • Auxiliary power generation (such as powering pumps, generators, and other onboard systems).
      • Fishing boats and cargo vessels that require medium to high levels of propulsion power.
11. Fuel Economy:
    • The QSB6.7 is known for its excellent fuel efficiency. With its advanced fuel system, turbocharging, and precise engine control, it ensures lower fuel consumption and fewer emissions, making it an economical choice for long-term operations.

Benefits:

• Powerful Performance: The 355 HP output provides ample power for propulsion, auxiliary power systems, and a variety of marine tasks.
• Fuel Efficiency: Advanced fuel systems, turbocharging, and intercooling technology optimize fuel use, delivering cost savings on fuel and reducing operational expenses.
• Durability: Built for marine environments, the QSB6.7 is designed to endure challenging conditions, offering a long service life and high reliability.
• Low Maintenance Costs: The engine’s design reduces maintenance needs, and the ease of servicing key components minimizes downtime, keeping maintenance costs low.
• Emissions Compliance: Meets stringent EPA Tier 3 and IMO Tier II emissions standards, making it suitable for environmentally-conscious operators and compliant with global regulations.
• Flexibility: The engine is compatible with various marine transmissions and applications, offering versatility for different vessel types and operational needs.

Conclusion:

The Cummins QSB6.7 355 HP Marine Diesel Engine offers powerful, efficient, and reliable performance for medium to large-sized marine vessels. Its advanced features, such as the turbocharging system, common rail fuel system, and emissions compliance, ensure it provides high power output while maintaining fuel efficiency and environmental responsibility. Ideal for a wide range of recreational, commercial, and auxiliary marine applications, the QSB6.7 is a top choice for operators seeking durability, low maintenance, and cost-effective operation in demanding marine environments.