Injection Pump; Governor Malfunctions; Fuel Control Lever Travel And Adjustment - Dodge D250 1990 Service Manual

Fuel System Malfunction - Diagnosis
Page 14-6
Fuel System
DODGE Turbo Diesel
Injection Pump
The Robert Bosch V E 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 F o r c e ^ )
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.