Recently, Yuchai Marine Power successfully delivered China's first 6X52DF-A-1.0 ammonia dual-fuel low-speed engine at its Zhuhai facility, marking another major milestone in Yuchai's commitment to green and low-carbon marine power development.
This ammonia dual-fuel engine will be deployed on 25,000 m³ LPG/liquid ammonia carriers. Featuring high-pressure liquid ammonia direct injection technology, it delivers load response and dynamic performance comparable to conventional diesel engines in both ammonia and diesel modes. Fitted with an HPSCR system, the main engine meets low-carbon emission requirements and complies with the IMO Tier III emission standards.
In July 2025, Yuchai Marine Power kicked off the construction of an ammonia fuel supply station, which provided solid support for the bench tests, production and delivery of ammonia dual-fuel engines. During factory trials, the entire workflow - including the initial switch to ammonia mode, ammonia load calibration, emission testing and final factory acceptance test - was completed in merely three days. Throughout the process, the main engine achieved zero liquid ammonia leakage and maintained stable operation, setting a global record for the fastest delivery of ammonia-mode marine engines.
From natural gas and methanol to ammonia, Yuchai has continuously forged ahead in the field of clean-fuel low-speed marine engines and built a complete product lineup covering all mainstream alternative fuels.
The successful delivery of China's first 6X52DF-A-1.0 ammonia dual-fuel low-speed engine is not only a vital milestone for Yuchai itself, but also demonstrates that China's marine power equipment industry has gained a prominent foothold in the global zero-carbon shipping drive. It also fuels the green transition of the global shipping sector with robust Chinese expertise and technology.