wsm M7040 - EGR Cooler; Thermo Valve

ENGINE
M6040, M7040, WSM
1-M17
(1) EGR Cooler
The EGR (Exhaust Gas Recirculation) cooler (3) is
used to lower combustion temperature and efficiently
cool EGR gas, with the aim of reducing the NOx that is
in the exhaust gas of diesel engine.
The EGR cooler (3) is placed between the cylinder
head (2) and the mechanical EGR valve (4) and returns
the cooled exhaust gases to the engine suction side.
The EGR cooler (3) has resistant to clogging up,
compact and efficient tubes (5) internally.
9Y1210143ENM0027US0
(2) Thermo Valve
Thermo valve (1) controls boost pressure "ON /
OFF" for the EGR valve.
If the coolant temperature (2) is low, thermo valve (1)
is closed, so that boost pressure does not reach to the
EGR valve.
If the coolant temperature (2) is high, thermo valve
(1) is open, so that boost pressure reaches to the EGR
valve.
9Y1210143ENM0028US0
(1) Flange
(2) Cylinder Head
(3) EGR Cooler
(4) Mechanical EGR Valve
(5) Tube
A: Coolant Inlet Port
B: Coolant Outlet Port
(1) Thermo Valve
(2) Coolant Temperature
(3) Boost Pressure Flow
(a) Boost Pressure From
Intake Manifold
(b) Boost Pressure To EGR
Valve
(c) Open
(d) Close
KiSC issued 07, 2012 A