A Series Diesel Engine Fuel System 72
Injection Pump
The injection pumps are rotary distributor pumps.
These pumps perform the 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.
A single plunger or rotor is used by the pumps to
develop and distribute the high pressure required for
injection.
A four-cylinder, Robert Bosch VE pump plunger is
shown in this illustration.
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
Robert Bosch VE adjustment screw, the fuel rate
may be out of adjustment.
To Next Page
Loading...
Need help?
General
