2
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EGR cooler to intake manifold gasket
4
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Exhaust manifold to EGR cooler tube gasket
The EGR system allows a measured quantity of exhaust gas to be directed back to the intake manifold. The exhaust gas is introduced to the incoming charge air in the intake manifold, where it mixes with the air/fuel mixture and lowers the peak gas temperature, reducing nitrogen oxide (NOx) exhaust emissions. The EGR valve is electrically operated and is controlled through an input from the powertrain control module (PCM).
The EGR system is fitted with an EGR cooler. The EGR cooler reduces the temperature of the exhaust gasses being returned to the intake system. By reducing the EGR temperature, the intake air charge density is not adversely affected, so maintaining the optimum fueling characteristics.
5
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Valve cover to air intake pipe PCV hose
The PCV system consists of an oil separator chamber connected to the crankcase and valve cover by hoses.
The crankcase pressure is controlled by a diaphragm operated PCV valve built into the valve cover. As the pressure in the oil separator reduces, the diaphragm valve closes against the force of the PCV valve spring, so closing the PCV valve. As the crankcase pressure rises, the PCV valve is pushed open assisted by the PCV valve spring. This allows the positive crankcase gasses to be scavenged by the air intake system.
