TM10-3950-672-24-2
Injection Pump
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, Lucas CAV DPA rotor is shown in this
illustration.
A worn or damaged rotor or 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.
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.
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