FUEL
SYSTEM
Angleich Mechanism. The Angleich Mechanism restricts the
movement
of
the smoke set plate
in
the narrower range
(Angleich effect
"L") to save fuel consumption and decrease
emission
of
exhaust smoke.
ANGLEICH
MECHANISM
o
ANGLEICH
EFFECT
"L"
Releasing the Angleich Mechanism. It is necessary when
starting the engine
to
set the injection pump in the over-injec-
tion (MS) condition by moving the throttle control lever fully
to the
FULL~OPEN
position. This requires the Angleich set
plate to be released from its set position. Usually the
Angleich set plate is released by pulling the throttle lever
until
it
is caught by its stopper when stopping the engine.
After starting the engine, the Angleich set plate is returned
automatically to the applied position during warm-up running
of
the engine.
..
The intercylinder injection control. Fuel injection control
among the cylinders is performed by the adjusting plates
which have their own cam mechanisms. These adjusting
plates are located on the opposite side
of
the control rack.
Necessary turning
of
the plunger barrels required for inter-
cylinder injection control is attained by turning the respective
adjusting plates. This adjustment is performed on a fuel shop
flow bench only.
ADJUSTING
PLATES
ADJUSTING
PLATE
o
PLUNGER
BARREL
Delivery valve operation. The delivery valve's function is to
deliver fuel to the injection pipes after the fuel pressure has
been increased sufficiently, and to prevent
"after-drip" from
the nozzles. When the fuel pressure above a plunger has
deceased after injection, its delivery valve piston closes the
delivery valve seat. At this time the compressed fuel remain-
ing in the injection pipe drips from the nozzle.
To
prevent
this
"after-drip", the delivery valve piston makes a stroke to
draw back the fuel before the delivery valve reaches the seat,
thus reducing the fuel pressure
in the injection pipe to nearly
zero.
DURING
INJECTION
AFTER
INJECTION
Nozzle
and
nozzle holder. Fuel from the fuel injection pump
flows through the passage
in
the body
of
each nozzle holder
and is injected from the nozzle into the combustion chamber.
Fuel overflowing from the nozzle enters the nozzle holder
and returns to the fuel tank through the banjo and attached
return fuel line.
Engines
&
Generators
38
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