Tug Boat Engine Emissions Control Suite

An emissions controlled tug boat diesel engine comprising:

• a tug boat;
• a Electro Motive Division (EMD) 645 series engine installed in the tug boat, the EMD 645 series engine providing power for motion of the tug boat;
• a fuel tank containing diesel fuel for combustion in the EMD 645 series engine;
• a fuel injection system including fuel injectors providing the diesel fuel to corresponding cylinders of the EMD 645 series engine;
• a cam operating the fuel injectors to control the timing and amount of the diesel fuel injected into the cylinders;
• a plunger residing inside each of the fuel injectors and actuated by the cam to pump fuel into the engine, the plunger rotatable to adjust an effective stroke determining the fuel injection timing and the amount of retard of the fuel injection from standard fuel injection timing to reduce NOx emissions, the fuel injection timing being adjust from approximately two degrees of fuel injection timing retard at idle to between approximately four degrees and approximately six degrees of fuel injection timing retard at maximum load;
• a fuel system delivering the diesel fuel from the fuel tank to a fuel injection manifold in fluid communication with the fuel injectors;
• and
• a heat exchanger receiving a flow of heated engine coolant and transferring heat from the heated engine coolant to a flow of the diesel fuel from the fuel tank to the injector manifold.