wsm M7040 - Mechanical EGR Valve; Reed Valve

ENGINE
M6040, M7040, WSM
1-M18
(3) Mechanical EGR Valve
Mechanical EGR valve (2) controls the flow of cooled
EGR gas (c) to the intake manifold.
If the boost pressure (b) is low, EGR valve (2) is
closed, so cooled EGR gas (c) does not flow to the
intake manifold (e).
If the boost pressure (b) is getting higher, EGR valve
(2) is opening and cooled EGR gas (c) is flowing to the
intake manifold (e).
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(4) Reed Valve
The reed valve (2) is provided at the confluence of
exhaust gas after passing the EGR valve (1), and intake
air. It operates by the pressure difference between inside
of the crankcase and the atmosphere, and prevents
backflow of the mixture of exhaust gas and intake air
generated by the piston and valves. It is used as the
secondary air introduction device for the
countermeasure against exhaust gas of four-cycle
engines.
9Y1210143ENM0030US0
(1) Thermo Valve
(2) Mechanical EGR Valve
(3) EGR Valve Lift
(4) Boost Pressure
(a) Boost Pressure from Inlet
Manifold
(b) Boost Pressure from
Thermo Valve
(c) Cooled EGR Gas
(d) Coolant
(e) Cooled EGR Gas To The
Intake Manifold
(f) Close
(g) Open
(1) Mechanical EGR Valve
(2) Reed Valve
(3) Reed Valve Housing
(4) Intake Manifold
(5) Valve
(6) Case
(7) Stopper
(8) Screw
KiSC issued 07, 2012 A