More Power, Fewer EmissionsTierIITierIIIGasMode 

The new 35/44DF marks the next stage in the expansion of MAN Diesel & Turbo’s dual-fuel engines portfolio, perfectly complementing the power range of the 51/60DF.


Dual-fuel engines using clean-burning liquefied natural gas (LNG) are one of the best options. Not only do these satisfy all emission requirements when running on gas, including the future IMO Tier III regulations, they also offer low operational and maintenance costs. Dual-fuel engines also have several advantages over engines that run only on gas. Most importantly, should there be any problems with gas operation, or a shortage of fuel, the ship can simply switch to liquid fuel.

Proven technology

The design of MAN Diesel & Turbo’s new medium-speed four-stroke engine is focused on gas operation: In this mode, the engine uses a separate pilot ignition system based on a well proven high-pressure injection technology employed in the truck industry. However, the engine is also equipped with a fully functional common rail injection system. This is modeled on our robust 32/44CR-T2, ensuring a highly reliable back-up solution.

Conversion from 32/44CR-T2

Another key feature of this engine is that it has been specifically designed to allow for conversion from MAN Diesel & Turbo’s popular 32/44CR-T2. Due to the high level of component compatibility, the engine can be easily re-machined on board.

Best in class

 An output of 530kW/cyl. clearly makes the 35/44DF the engine with highest power output in its segment. Yet it still fulfills the current IMO Tier II emissions limit in liquid fuel mode, and the future IMO Tier III limit in gas operation, without the need for any additional after-treatment systems. In addition, the engine is designed to offer a high degree of fuel flexibility: it operates reliably on all kinds of marine fuels such as HFO, MDO, and MGO – and of course LNG. All these factors make the 35/44DF ideal for ships needing a clean yet efficient form of propulsion: ferries, RoRo, cruise ships, gas tankers, and offshore service and supply and production vessels, to name just a few.