The 2003–2004 Cummins 5.9L marine engine delivers strong, reliable performance for tough marine environments. This turbocharged inline-six runs on the advanced 24-valve platform and features a Bosch high-pressure common rail fuel system for cleaner combustion, better fuel efficiency, and sharper throttle response.

Its cast iron block, forged crankshaft, and heavy-duty internals handle continuous load with ease. A closed-loop cooling system and corrosion-resistant components ensure long life in saltwater use. Ideal for workboats, sportfishers, and cruisers, this engine brings proven power to any vessel.

Power your next trip with the trusted strength of Cummins—choose the 5.9L marine engine built to perform.