New MAN dual-fuel four-stroke passes TAT

Written by Nick Blenkey
new MAN dual-fuel four stroke passes an approval milestone

The successful Type Approval Test of the new MAN 49/60DF four-stroke was carried out at MAN Energy Solutions headuarters in Augsburg, Germany

MAN Energy Solutions’ MAN 49/60DF engine has received its Type Approval after a five-day program on the testbed at the company’s Augsburg, Germany, headquarters. The Type Approval Test (TAT) of the new dual-fuel four-stroke was witnessed by representatives of classification societies ABS, BV, CCS, DNV, LR and RINA who signed the test protocol on successful completion of the test schedule.

“Today marks the latest milestone in the 49/60DF’s journey since its concept release in 2018,” said Marita Krems, head of four-stroke marine & license, MAN Energy Solutions. “As we enter a new era of decarbonization, the 49/60DF is an obvious choice for vessel owners with ambitious, emission-reduction targets that prize full fuel-flexibility and multiple options for clear emission paths.”

“Over the last eighteen months, we have demonstrated the engine’s reliability and robustness,” said Thomas Huchatz, sales manager, four-stroke marine, MAN Energy Solutions. “The TAT now issued is a certificate of conformity that confirms that the engine meets the regulatory, technical and safety requirements required to enter the marketplace.”


MAN Energy Solutions announced the launch of the 49/60DF at the 2022 SMM trade fair in Hamburg. The most recent addition to its four-stroke engine portfolio, the dual-fuel engine is capable of running on LNG, diesel and HFO as well as a number of more sustainable fuels including biofuel blends and synthetic natural gas.

The company says the new dual-fuel four-stroke engine sets a benchmark in terms of four-stroke sector fuel efficiency – both in gas and diesel mode – and thus minimizes fuel costs and the potential costs for CO2-emission certificates.

The new 49/60DF engine platform features MAN’s latest technologies, including two-stage turbocharging, second-generation common-rail fuel injection, the SaCoS5000 automation system, and MAN’s next-generation Adaptive Combustion Control ACC 2.0 that automatically optimizes combustion. The engine also retains well-proven MAN technologies such as the gas-injection system, pilot-fuel-oil system and MAN SCR (selective catalytic reduction) system.


The MAN 49/60DF can operate and even start in gas mode where it complies with IMO Tier III without exhaust gas after-treatment. In diesel mode, it complies with Tier III when combined with MAN’s SCR system.

Soot emissions in diesel mode are halved due to the second-generation common-rail system 2.2, while the 49/60DF’s methane emissions are also drastically reduced in gas mode. The engine’s benchmark efficiency and fuel-flexible design offers multiple paths to emission compliancy leading up to 2050, as set out in the current Fuel EU draft.

The new engine is also methanol-ready, meaning it is inherently ready for retrofit to running on methanol should the demand arise at a later stage. Conversions are straightforward as all engine variants originate from an initial, modular engine design.


MAN Energy Solutions is also introducing a pure diesel engine based on the 49/60 platform that will be methanol- and LNG-ready and features the same technology upgrades as its dual-fuel sibling; the engine can also operate on bio-fuels. This pure-diesel version allows MAN’s new common-rail system to fully play to its strengths of low-emission and low-vibration operation, paired with the maximum flexibilty to design the combusion process to minimize fuel costs. Furthermore, its high power-density extends the power range of inline engines into applications traditionally the domain of V-type engines.

  • More on the 49/60 HERE
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