Chapter 3 Fuel Injection Equipment
5. Injection Pump Construction and Operation ?n
,
4LHA Series
Cylinder
A
Cylinder
B
Cam
lift
•
Compression
stroke
I I Suction stroke
NORMAL
DIRECTION
REVERSE
DIRECTION
Fig.
14 Plunger strokes for cylinders A and B
0
Reverse
rotation
prevention
While
the plunger is moving in the normal
direction of rotation, the inlet
port
is open dur-
ing the plunger's
return
stroke and sufficient
fuel oil is sucked
into
the pressure chamber.
During the compression stroke the inlet
port
is
closed
and injection is performed.
However,
should the engine rotate in the re-
verse
direction (e.g. when a stationary, parked
vehicle
begins to roll backwards and the engine
is
rotated, etc.) the plunger barrel's inlet
port
and
the plunger's inlet slit will align during
plunger
lift,
the fuel oil cannot be pressurized
and
non-injection will result.
Because
of this the engine will immediately
stop.
Injection
quantity
control
Fuel
injection quantity is increased or de-
creased
by the effective stroke, which is varied
by the position of the control
sleeve.
Control
sleeve
(
Plunger's
Cut-off
port
Decreasing
injection quantity <^
1
Shorter
effective stroke
i ^> Increasing injection quantity
Longer
effective stroke
:
ig.
15 Plunger's effective stroke
3-1-13
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