John Deere Power Tech marine engines are some of the most powerful on the water with solid, deliverable torque in the useable operating range. In addition, they are compact and quiet. Whether you are building a new boat or re-powering an existing one, John Deere 4- and 6-cylinder in line diesel engine from 75 to 450 hp (56 to 336kW) are available for propulsion, auxiliary and generator applications.