Advertisement
(2)
Smoke Set
A smoke set is installed to control the maximum-fuel injection rate.
The stopper is held by a spring in the illustrated position.
This
position
is
the
smoke
set position.
To start a cold engine,
the
throttle lever is pulled fully toward the maximum number of rotation
and the control rack is moved by the governor lever in the direction
of the arrow overcoming the spr ing force of the stopper thus causing
excessive injection.
The fuel injection rate between the two barrels
is adjusted by the plunger barrel which rotates on the adjusting plate
with cam mechanism located on the opposite side of the control rack.
Spring
Adjusting plate
Plunger barrel
Lever~
(3)
Delivery Valve
In addition to the function to deliver the fuel into the injector line
after the fuel pressure has increased sufficiently high, the delivery
valve has another important function to prevent nafter-dripn from the
nozzle tip after completion of injection.
When the fuel pressure above the plun-
ger
has
dropped at the completion of
injecting,
the
delivery
valve
piston
moves to close the delivery valve seat,
but at that time,
the compressed fuel
still remains in the line which results
in the after-drip from the nozzle tip.
To
prevent
this
after-dripping,
the
delivery
valve piston sucks
back
the
fuel
remaining
in
the
injection
line
before
the delivery valve
is
seated,
thus reducing the fuel pressure in the
injector line almost to zero.
69
During injection
End of injection
Advertisement
