Caterpillar has announced the availability of the 3412D propulsion engine to the commercial marine market. The V-12, four-stroke-cycle-diesel engine offers higher horsepower output than its predecessor, the Cat® 3412C. The 3412D also meets customer demands for more power without compromising engine life. The 3412D is based on the proven reliable and durable 3412C platform with several significant improvements. The 3412D bore and stroke have been increased to 145 mm by 162 mm (5.7 in. by 6.4 in.) to provide 32.10 liters (1,959 cu. in.) displacement. The 3412D turbocharger and nozzle technology provides the following benefits: no visible smoke during steady-state operation and significantly less transient smoke.