MAN Energy Solutions Successfully Passes Type Approval Test for MAN L35/44DF Engine
German engine manufacturer MAN Energy Solutions (MAN ES) has recently achieved a significant milestone by passing the type approval test (TAT) for its MAN L35/44DF engine. The engine is approved for use as an auxiliary GenSet and for electric propulsion, operating at constant speeds of 720 and 750 rpm, respectively.
The TAT, which took place from April 7-11, 2025, at the Changwon headquarters of STX Engine in South Korea, involved testing both variants of the 35/44DF engine – the methane-capable 35/44DF CD and the methanol-ready 35/44CD. Six classification societies participated in the event, validating the engine’s capabilities.
The L35/44DF CD engine is an upgraded version of the L35/44DF CR engine, boasting features such as an adaptive combustion control (ACC) system that ensures optimal fuel-injection conditions by monitoring combustion in real time.
MAN ES aims to offer shipowners a cost-effective and environmentally friendly solution with the 35/44DF CD engine. The engine promises minimal greenhouse gas emissions and can reduce methane slip by up to 85% compared to industry standards, making it a sustainable choice for the future.
Alexander Knafl, Senior Vice President at MAN ES, expressed his optimism about the engine’s potential, especially in the container vessel and LNG carrier segments. He highlighted the engine’s strong performance, reduced methane slip, and readiness for future fuels like methanol.
Sephardim Koblenz, Vice President and Head of Licensing at MAN ES, emphasized the advanced technology and features of the 35/44DF CD engine, including connectivity and cybersecurity measures. He pointed out the engine’s reliability, fuel efficiency, and cost optimization as key selling points.
In addition to the success of the MAN L35/44DF engine, MAN ES also achieved approval for its 7L21/31 dual-fuel methanol (DF-M) GenSet earlier in 2025. The GenSet passed the type approval test in cooperation with CSSC Marine Power (CMP) in Zhenjiang, China, receiving approval from major classification societies.