Advance Timing Mechanism; Electrical Shut Off Valve - Dodge D250 1990 Service Manual

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.