Engine Systems
The engine systems are as follows:
Fuel System
The fuel system consists of DDEC control system, fuel injectors, high pressure fuel rail, low and high pressure pumps, fuel filter module, prefilter, final filter, and the necessary connecting fuel lines.
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, is drawn to the turbocharger, is then compressed, 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 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. Two thermostats located in the oil/coolant module attached to the right side of the cylinder block controls the flow of coolant. The coolant module incorporates the oil cooler, oil filter, and coolant pump.
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 and EGR valve. The EGR valve allows 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 in accordance with EPA regulations.
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.
Engines for on-highway EPA 2007 regulation applications use a cooled EGR system along with an Aftertreatment System to meet the emission standards.