Chapter 3 Fuel Injection Equipment
1. Fuel Supply System
4LHASer
1-3
Functioning
of
fuel
injection
pump
Operator
side Engine side
1. Plunger
2.
Plunger barrel
3.
Lead groove
4.
Intake
port
5.
Delivery valve
6. Delivery valve seat
7. Control sleeve
8. Control rack
9.
Fuel
leak
return
groove
10.
Protector
leak
return
hble is provided in the plunger barrel. This returns
fuel which
leaks
through the gap between the plunger and the
barrel to the fuel lines, preventing dilution of the lubricant in
the cam chamber.
Intake/discharge
port
-
Plunger
barrel
Increase fuel volume
Helix
(Lead
groove)
Connecting
groove
Plunger
The
fuel injection pump supplies
pressurized
fuel to the injec-
tion
nozzles through the action of the plunger. The plunger
reciprocates
in the plunger barrel
with
a fixed stroke and is
lapped
for a precise fit. A lead groove is helically cut in the
plunger, and this leads to a connecting groove which rises to
the top of the plunger.
The
integrate plunger
barrel,
the plunger barrel and the flange
case
for the delivery valve holder, equips a
port
for intake and
discharge.
The injection volume of individual cylinders can
therefore be adjusted by rotating the integrate plunger barrel.
The
fuel comes through this
port
into
the plunger chamber, is
pressurized
by the plunger, opens the delivery valve, flows to
the fuel injection nozzle through the fuel injection pipe and is
injected
into
the combustion chamaber.
Fuel
injection ends
when the pressurized fuel has been discharged. This hap-
pens
when the lead groove lines up
with
the
port,
(as the
plunger rises and the pressure in the fuel injection pipe
drops).
The
control sleeve groove is
fitted
to the plunger flange. The
control knob of the control sleeve is inserted in the control
rack groove.
The
rack controls the plunger, allowing continuous changes
in the volume of fuel injected from zero to maximum. A fuel
3-2-3
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