Renowned worldwide for reliable, durable and efficient powerplants, Yanmar America now offers the 12AY series High-Speed Commercial Workboat diesel engine. With easy installation and maintenance, the purpose-built 12AY is ideal for offshore support vessels, ferries, tugs, commercial fishing craft and other demanding applications.
A key element of the improved performance and efficiency is a new staggered injection nozzle and patented combustion chamber design. They allow a very wide rpm range with low fuel consumption and emissions. The 40L, 12-cylinder turbocharged diesel engine is available in five power ratings across three models. The 12AYM-WST models produce 1,200 mhp(882 kW) @ 1,850 rpm and 1,400 mhp(1,030 kW) @ 1,900 rpm. The 12AYM-WET versions have outputs of 1,550 mhp(1,140 kW) @ 1,840 rpm and 1,659 mhp(1,220 kW) @ 1,900 rpm. The 12AYM-WGT produces 1,822 mhp(1,340 kW) @ 1,940 rpm.
A new V cylinder block configuration offers improved rigidity compared to previous models, with inspection ports providing easy access to connecting rod assemblies. A mechanical engine governor control and Yanmar's own fuel system components further enhance reliability. Compliant with the latest IMO Tier II emissions regulations, the 12AY series has type approval by the six major classification societies.