SAFARI

102 4 DLT ENGINE EGR SYSTEM (If fitted) Fig. 191 Schematic diagram of EGR circuit on Safari Euro - III Engine Exhaust Gas Recirculation The basic purpose is to tap out a part of exhaust gas from the exhaust manifold and mix with the intake air of the engine in part load and part speed conditions thus reducing the amount of harmful pollutants. Please note that during cold starting till the glow plug remains on, the EGR system does not function thus avoiding any hunting or vibration at initial start conditions. SystemComponents EGR CONTROLLER : The EGR system of the vehicle is controlled more precisely based on engine speed, throttle lever position. The EGR CONTROLLER is mounted on the firewall inside the engine compartment. EGRValve (EGR-V) The EGR valve is a diaphragm valve that is actuated by vacuum from the Vacuum Pump. The valve is mounted on the inlet mani fold. It has three connections, one for the vacuum, one for the exhaust gas inlet from the exhaust manifold and one for the exhaust gas outlet to the inlet manifold. The exhaust gas starts flowing into the inlet manifold once the vacuum is fed into the valve. EGR Electro pneumatic solenoid switch Note : Care should be taken to connect the ports of the Electro pneumatic solenoid switch to their respect ive hoses. Any interchanging of the connections will lead to malfunctioning of the EGR system. Additionally, existence of small filter with foam needs to be ensured on the connection open to atmosphere. EGR pipe : This pipe connects the exhaust manifold to the EGR valve. Exhaust / Inlet Manifold The exhaust manifold has a precisely machined hole through which the exhaust gases are tapped out.