M-18
07-E3B SERIES, WSM
ENGINE
7. EXHAUST GAS RECIRCULATION (EGR) SYSTEM
[1] GENERAL
In order to meet with the strict emission regulations, Kubota has adopted the EGR on the V2607-DI-T-E3B, V3007-
DI-T-E3B and V3307-DI-T-E3B. The nitrogen oxide (NOx) which is a hazardous component in exhaust gas is
generated by oxidation of nitrogen in the air, due to rise of the combustion temperature in cylinders. The EGR is a
system in which the exhaust gas with lean oxygen is cooled and returned to cylinders again in order to lower the
combustion temperature. As a result, NOx can be decreased.
[2] EXTERNAL MECHANICAL EGR
External mechanical EGR consists of water cooled EGR cooler (5), mechanical EGR valve (2), reed valve (4) and
thermo valve (1).
When the coolant temperature (b) is getting higher, thermo valve (1) is open and the boost pressure of intake
manifold (6) gets to reach the diaphragm of mechanical EGR valve (2).
If the coolant temperature (b) is high, but the boost pressure is low, the EGR valve (2) does not open. If coolant
temperature (b) is high, boost pressure is also high, EGR valve (2) is open and cooled EGR gas (a) through the water
cooled EGR cooler (5) flows into the intake manifold (6). And the reed valve (4) between EGR valve (2) and intake
manifold (6) prevents the fresh air flowing into EGR system.
(1) Thermo Valve
(2) Mechanical EGR Valve
(3) Cylinder Head
(4) Reed Valve
(5) EGR Cooler
(6) Intake Manifold
(a) Cooled EGR Gas
(b) Coolant Temperature
(c) Boost Pressure
(d) To The Intake Manifold
(e) Fresh Air
(f) Cooled EGR Gas Merges
with Fresh Air
(g) Exhaust Gas
(h) Coolant Inlet
(i) Coolant Outlet
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