Wärtsilä 46DF Marine Engine – Dual‑Fuel Power for Modern Marine Applications
Engine Summary
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Engine Information
Engine Family: Wärtsilä 46DF Marine Engine – Dual‑Fuel Power for Modern Marine Applications
Engine Type: Dual Fuel Engine
Description
The Wärtsilä 46DF is a high‑output, medium‑speed dual‑fuel marine engine designed for demanding propulsion and auxiliary applications. It can operate on natural gas, marine diesel oil, or heavy fuel oil, allowing ship operators to switch fuels based on availability, cost, and emission requirements. With its proven dual‑fuel combustion concept, high thermal efficiency, and robust mechanical design, the 46DF delivers reliable power, low specific fuel consumption, and reduced exhaust emissions. This makes it a popular choice for LNG carriers, tankers, offshore vessels, and other ships that require flexible, future‑proof propulsion solutions.
Specifications
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Dimensions & Weight
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Compliance
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Accessories
Standard Accessories
- Engine‑mounted lubrication oil pump
- Jacket water pump (HT circuit)
- Low‑temperature cooling water pump (LT circuit)
- Fuel oil supply and transfer pumps
- Charge‑air cooler and piping
- Turbocharger (standard configuration)
- Integrated oil filters and separators
- Starting air system components
- Crankcase ventilation system
- Engine‑mounted sensors and instrumentation
- UNIC control and monitoring system
- Flexible coupling and mounting elements
- Standard safety and shutdown devices
- Wiring harness and electrical interface modules
Optional Accessories
- Additional gas valve unit (GVU) configurations
- Enhanced SCR or EGR emission‑reduction modules
- Alternative turbocharger setups for optimized performance
- Fuel gas supply system (FGSS) integration options
- Extended automation and remote‑monitoring packages
- Redundant lubrication and cooling pump arrangements
- Advanced vibration and condition‑monitoring systems
- Customized air‑intake and exhaust modules
- Heavy‑duty starting air system components
- Alternative alternator and power‑take‑off options
- Upgraded filtration and separation units
- Winterization and cold‑climate operation kits
- Acoustic insulation and noise‑reduction packages
- Special mounting and foundation solutions
Warranty
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Additional Notes
The Wärtsilä 46DF engine is designed to provide maximum operational flexibility, allowing seamless switching between gas and liquid fuels to ensure continuous operation under varying fuel availability and regulatory conditions. Its dual‑fuel technology supports compliance with current and future emission standards, making it suitable for a wide range of marine applications. The engine’s modular design simplifies installation, integration, and maintenance, while the advanced UNIC control system ensures precise monitoring and optimized performance across all load ranges. Depending on vessel type and operating profile, the engine can be combined with various auxiliary systems, hybrid configurations, or energy‑efficiency solutions to further enhance overall propulsion performance and lifecycle value.