Engine Systems
The engine systems are as follows:
Two-Filter Fuel System
The two-filter fuel system consists of DDEC control system, fuel injectors, low and high pressure pumps, fuel filter module, prefilter, coalescer/final filter, and the necessary connecting fuel lines. The common rail system with injectors provides amplification for better fuel atomization.
Lubrication System
The lubrication system consists of an oil pump, oil cooler, cartridge-style oil filter, pressure regulator valve, and oil pressure sensor. Clean, pressurized oil is fed to all components via passages in the engine block and cylinder head.
Air System
Outside air enters the engine through the air filter and is drawn to the turbocharger and then is compressed, and forced through the air-to-air charge cooler (heat exchanger) and is cooled. Next, it flows to the intake manifold and into the cylinders, where it mixes with atomized fuel from the injectors.
For optimum engine protection from dust and other airborne contaminants, service the dry-type air cleaners used when the maximum allowable air restriction has been reached.
Cooling System
A radiator/thermo-modulated fan cooling system is used on the engine. This system has a centrifugal-type coolant pump to circulate coolant within the engine. One full-blocking type thermostat located in the coolant module attached to the left side of the cylinder block controls the flow of coolant.
Electrical System
The electrical system consists of a starting motor, starting switch, battery-charging alternator, storage batteries, and necessary wiring.
Exhaust System
Hot exhaust gas from the exhaust manifolds is used to drive the turbocharger.
Exhaust Gas Recirculation System
The Exhaust Gas Recirculation (EGR) system consists of an EGR cooler, EGR valve and actuator. The EGR actuator opens and closes the EGR valve to allow hot exhaust gas to enter the EGR cooler. Heat is extracted from the exhaust gas, resulting in cooler exhaust gas to the cylinders. EGR lowers the temperature of the exhaust from the engine, therefore, reducing exhaust gas emissions to acceptable levels.
The purpose of the Exhaust Gas Recirculation System (EGR) is to reduce engine exhaust gas emissions.
The EGR system has been optimized to dramatically cut NOx formation by routing a measured amount of exhaust flow to the cylinders to lower combustion temperatures. Lower temperatures result in lower NOx levels without the negative effects of retarding engine timing. The EGR valve has been moved to the top of the engine for improved serviceability.
On the 260 - 350 horsepower engines, the EGR is fed by all six cylinders. The low horsepower engines use an asymmetric turbocharger with two entries, and the EGR is fed from the first three cylinders, taken from a small entry. The exhaust with a maximum exhaust gas temperature of 730°C (1346°F) is cooled to a maximum of 150°C (302°F) in the EGR cooler. The cooled exhaust gases then pass through the EGR valve and added to the mixer housing. The addition of cooled exhaust gases back into the combustion airflow reduces the peak cylinder combustion temperature. Less oxides of nitrogen (NOx) are produced at lower combustion temperatures.