The engine will be exhibited at the forthcoming SMM trade fair in Hamburg. The 12 AY is designed for easy installation and maintenance, and features a new staggered injection nozzle and patented combustion chamber design. These allow a very wide rpm range with low fuel consumption and emissions.

The 40-litre turbocharged engine is available in five power ratings across three models. The 12AYM-WST models are available at 1,200bhp (882kW) at 1,850rpm and 1,400bhp (1,030kW) at 1,900rpm. The 12AYM-WET is available at 1,550bhp (1,140kW) at 1,840rpm and 1,659bhp (1,220kW) at 1,900rpm. The 12AYM-WGT produces 1,822bhp (1,340kW) at 1,940rpm.

The new V-cylinder block configuration offers improved rigidity compared to previous models, with inspection ports providing access to connecting rod assemblies. A mechanical engine governor control and Yanmar's own fuel system components are fitted. Compliant with IMO Tier II, the 12AY series has type approval by the six major classification societies.