Fuel
System
Malfunction -
Diagnosis
Fuel System
Page
14-8
DODGE
Turbo Diesel
Advance
Timing Mechanism
Regulated
pressure
produced by the vane supply pump in the
injection pump is
used
to
advance
the timing. Timing
advances
as
the engine
speed
increases.
A return spring is
used
to retard
the timing as the engine speed is reduced, if a spring should
break, the timing will go to the advance position resulting in
torque
loss,
a fuel knock and
possible
engine overheating.
Retarded (late) timing will result In torque
loss,
high fuel
consumption
and white to black
smoke.
Replacement
of the spring and repair of the advance timing
mechanism
must be performed by an authorized injection
pump
service
center.
Electrical
Shut Off Valve
The
injection pump is equipped
with
electrical shut off valve.
This
solenoid-operated valve
blocks
the supply of fuel to the
high
pressure
pumping and distribution components.
Caution;
Do not connect the electrical wire to the
solenoid
when the plunger has been removed.
Without
the plunger the valve can be damaged.
Malfunctioning valves can be diagnosed by removing the
plunger and
spring,
then
reinstall
the
solenoid.
Warning: If the plunger and spring Is removed
from
the
solenoid,
the engine will start when cranked.
Make
sure
the transmission Is In Park or Neutral
with
the Parking
Brake
Set.
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