Egr Cooler; Thermo Valve - Kubota WSM 07-E3B Series Workshop Manual

07-E3B SERIES, WSM

(1) EGR Cooler

(2) Thermo Valve

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.
(1) Flange
(2) Cylinder Head
(3) EGR Cooler
(4) Mechanical EGR Valve
(5) Tube
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.
(1) Thermo Valve
(2) Coolant Temperature
(3) Boost Pressure Flow
M-19
ENGINE
A : Coolant Inlet Port
B : Coolant Outlet Port
W1175338
(a) Boost Pressure From Intake
Manifold
(b) Boost Pressure To EGR
Valve
(c) Open
(d) Close
W1175753
KiSC issued 06, 2020 A