82410 • 82710 • 82910 WSM, 12271
(4) Injection Pump
1 ENGINE
A Bosch
MD
type
mini
pump
is used for the injection
pump. It is small, lightweight and easy to handle.
The
plunger (7) with a left-hand lead reciprocates via
the
tappet roller (2)
by
means
of
the fuel camshaft,
causing
the
fuel
to
be
delivered into the injection nozzle.
11900F10150
(1) Control Rack
(2) Tappet Roller
(3)
Dumping Valve
(4)
Delivery Valve Holder
(5)
Delivery Valve
(6)
Cylinder
(7) Plunger
11900M10170
• Injection Control
1. No fuel delivery (Engine stop)
At
the
engine
stop
position of the control rack (3), the
lengthwise slot (1) on
the
plunger (2) aligns with the feed
hole (5). And
the
delivery
chamber
(4) is led
to
the feed
hole during
the
entire stroke of the plunger.
The
pressure in the delivery
chamber
does
not build
up and no fuel
can
be forced
to
the injection nozzle.
2. Fuel delivery
The
plunger
(2) is rotated (see figure)
by
the
control
rack (3).
When
the
plunger
is pushed up, the feed hole (5) is
closed.
The
pressure
in
the
delivery
chamber
(4) builds
up and
forcefeeds
the
fuel
to
the injection nozzle until
the
control
groove
(6)
meets
the feed hole (5).
The
amount
of
the
fuel corresponds
to
the distance
11900F10160
"A".
(1) Slot
(2) Plunger
(3) Control Rack
1-M15
(4)
Delivery Chamber
(5)
Feed Hole
(6)
Control Groove
11900M10180
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