M.4
FUEL
SYSTEM
68
mm STROKE SERIES
WSM,
01
161
[3]
FUEL
FEED
PUMP
I
U
0
109F033
141
INJECTION
PUMP
0109F034
The filtered fuel
is
fed to the injection pump by
the fuel fed pump.
The chamber
(1)
is
enclosed
with
the
inlet
valve
(2),
the outlet valve
(5)
and the diaphragm
(6),
which
is
linked to the rocker arm with the pull rod
(7).
The
rocker arm
is
swinged by the eccentric cam on the
fuel camshaft
(4).
When
the
diaphgram
is
pulled down, vaccum
in
the chamber
(1)
causes the outlet valve
(5)
to close
and
the
atomospheric pressure
in
the fuel tank to
force the fuel into the chamber, opening the
inlet
valve
(2).
When the diaphragm
is
pushed up by the cam, the
pressure
in
the chamber causes the inlet valve to
close and forces out the fuel, opening
the
outlet
valve.
(A)
Inlet Stroke
(B)
Discharge Stroke
(a) from fuel filter (b) to injection pump
(1) Chamber
(5)
Outlet Valve
(2)
Inlet Valve
(6)
Diaphragm
(3)
Rocker Arm
(7)
Pull Rod
(4) Fuel Camshaft
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
right-hand lead recipro-
cates via the tappet roller
(9)
by means
of
the
camshaft fuel cam, causing the fuel to
be
delivered
into the injection
nozzle.
(1) Delivery Valve Holder
(6)
Cylinder
(2)
Delivery Valve Spring
(7)
Plunger
(3)
Delivery Valve
(4)
Control Rod (9) Tappet
(5)
Control Sleeve
(8)
Plunger Spring
M-21
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