M.5 FUELSYSTEM
92.4mm
STROKE
SERIES
WSM,
01092
(3)
Dumping
Valve
0087F025
(4)
Injection Control
I
1
2
3
0
001
1
F045
1.
At
fuel injection
Since
dumping
valve
is
pushed up to press the
spring, fuel
is
pressure-fed to injection nozzle the
same as without dumping
valve.
At suck-back by delivery
valve
after fuel injection
fuel returns through dumping valve orifice
Generally second injection
is
apt to occur by reflex
pressure due to reaction of sudden pressure drop
when changing into suck-back by delivery valve
from high injection pressure. As a result of
preventing this second injection perfectly by
dumping
valve
and dissolving nozzle clogging,
durability of injection nozzle
is
improved.
2.
At
suck-back
1.
No
fuel delivery
-....
Engine
stop
When the control rack
(5)
is
set
at the engine
stop
position, the plunger does not force fuel and no
fuel
is
delivered since the feed hole
(1)
aligns with
the slot
(6)
in
the
plunger
(3).
When the plunger
(3)
is
rotated by
the
control rack
(5)
in the direction of arrow,
the
fuel
is
delivered
to the injection nozzle.
The amount of fuel corresponds to
the
effective
stroke
(A)
from closing the feed hole
(1)
by the
plunger head to contact of
the
control groove
(2)
with the feed hole.
When
the
control rack
is
moved to
the
extreme
end in the direction
of
the
arrow,
the
effective
stroke
(8)
of the plunger
is
at
its
maximum, thus
the maximum
fuel
delivery occurs.
2.
Partial fuel delivery
3.
Maximum fuel delivery
(1)
Feed
Hole
(2)
Control
Groove
(3)
Plunger
(4)
Control
Sleeve
(5)
Control
Rack
(6)
Slot
M-25
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