A Series Diesel Engine Fuel System 74
Caution : The fuel control lever on the Robert Bosch
VE pump is indexed to the shaft during pump
calibration. If the lever has been removed and
reinstalled incorrectly, engine speed and
power will be affected.
Manual Shut Down Levers
Injection pumps are equipped with mechanical shut
down levers. These levers are spring-loaded in the run
position. Not all applications will use these manual shut
down controls and there will be no cable or rod
connected to the lever.
Note : Partial actuation of the mechanical shutdown
levers will affect fuel flow and engine power.
Low power or the inability to stop the engine with the
manual shut down control can be corrected by adjusting
the cable/rod length to permit stop-to-stop lever travel.
Advance Timing Mechanism
Regulated pressure produced by a vane supply in both
injection pumps is used to advance the timing 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.
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