Fuel
System
Malfunction -
Diagnosis
Page
14-6
Fuel
System
DODGE
Turbo Diesel
Injection Pump
The
Robert
Bosch
VE injection pump is a rotary distributor
type pump.
This
pump performs four
basic
functions
of:
1.
Producing
the high fuel
pressure
required for injection.
2.
Metering
the exact amount of fuel for
each
Injection
cycle.
3. Distributing the high pressure, metered fuel to each
cylinder
at the
precise
time.
4. Varying the timing relative to engine
speed.
The
pump
uses
a single plunger to develop and distribute the
high
pressure
required for injection.
A
worn or damaged plunger can affect the pressure and
amount of fuel Injected, thus reducing the power
from
the
engine.
Generally, if the pump is injecting fuel
from
one outlet,
it will deliver
from
all outlets. The only exception to this would
be a malfunctioning delivery
valve.
Governor
Flyweights
Contrbl
Spring
<^Wwflht
ForcejSpring Force^)
Balance
A
Governor
Malfunctions
Balance
between the flyweight governor and control lever
position controls the metering of the amount of fuel to be
injected.
The
pump governor performance and setting can affect engine
power.
Special
equipment and qualified personnel are required
to verify governor performance. If the
seals
are broken on the
external adjustment
screw,
the fuel rate may be out of
adjustment. The warranty of the pump and engine may be
void If the
seals
have been tampered
with
or removed.
Fuel
Control Lever Travel and Adjustment
The
amount of fuel injected and
subsequently
the speed and
power
from
the engine is controlled by the fuel control lever.
Restricted
travel of the lever can
cause
low power. Always
check
for
full
travel of the lever when diagnosing a low power
complaint.
To Next Page
Loading...
