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Mitsubishi 4DQ5 Service Manual Page 60

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Page view 59
1.
Fuel circuit
1-Air
vent
plug
2-Fuel
filter
3·Air
vent
plug
4-Air
vent plug
FUEL
SYSTEM
5-Fuel
injection
pump
6-Fuel feed
pump
7-Fuel injection pipe
a-Fuel injection nozzle
Fuel circuit
The fuel feed pump, mounted
on
the fuel injection
pump body and forming a part
of
the injection pump
unit, draws fuel from the fuel tank and delivers it
through the fuel filter
to
the gallery inside the injection
pump_
The injection pump
is
of
individual plunger type, con-
sisting
of
four plunger pump elements which are driven
from a common camshaft. Each pump element delivers,
intermittently, a shot
of
high-pressure fuel oil
to
its
injection nozzle through its own injection pipe. These
shots are synchronized
to
the diesel cycle in' each
cylinder and timed by the setting
of
the timing mecha-
nism.
"Injection quantity,"
or
the amount
of
fuel delivered
uniformly
by
the four pump elements
to
the engine
through their injection nozzles,
is
controlled from the
accelerator through a linkage and automatically adjusted
by the injection pump governor on the basis
of
engine
speed and load requirements.
The governor built in the injection pump body
is
a
mechanical all-speed governor, which limits the maxi-
mum and minimum engine speeds and actuates the
control rack
of
the injection pump
to
maintain a
constant engine
speed under varying load condition at a
speed level proportional
to
the pOSition
of
the accelera-
tor.
-56-
9-Fuel leak-off pipe
10-Fuel pipe
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