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 manifold. 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

respective 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.