Some extracts from the Aurora diesel gen manual.
Starting procedure:
5. Ensure fuel shut off is in the OPEN position
6. Move the engine RUN lever to RUN position
The diesel engine is shutdown by the operator depressing the engine STOP lever
which places the fuel injection pump control rack in the no fuel position. Stop the fuel
and you stop the engine. For models that can be shut off by an electric switch, an
electric solenoid pulls a cable that releases the same RUN/STOP lever. The
drawbacks are that you have to reset this RUN/STOP lever back to the run position
the next time you want to use the generator.
Alternatively some models use an electric fuel switch to stop the fuel from reaching
the fuel pump. The switch is an electric magnet that pulls open a spring loaded
plunger with rubber stopper at the end of it. When open, the engine can run
normally. When closed it starves it of fuel causing it to shut down.
Diesel engine speed is maintained by the speed control system which includes the
mechanical governor, governor lever, RUN lever, and STOP lever. The system is
designed to maintain engine speed under load at a constant rate of between 3570
and 3630 rpm (no load speed of 3750 rpm).
The governor is the flyweight-type, with the weights mounted on a gear driven by the
engine camshaft gear. The force of the flyweights is transferred through a thrust
sleeve and collar to the governor lever which is balanced against the tension of the
governor spring. The spring is stretched between the governor lever and the engine
RUN lever. When the engine speed drops below the governed speed, the resulting
decrease in governor flyweight / camshaft rotation places tension on the governor
spring. The tension repositions the fuel injection pump rack and increases the stroke
of the plunger in the fuel injection pump allowing more fuel to flow to the pump
delivery valve. The increase in fuel flow causes the diesel engine to speed up. As
the diesel engine recovers to the governed speed, the governor flyweight / camshaft
rotation stabilizes and the tension on the governor spring relaxes. This changes the
AGI6500DE & AGI6500SDE Operator / Owners Manual Version 11.3
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position of the fuel injection pump rack and shortens the stroke of the plunger
allowing less fuel to flow to the fuel injectors maintaining the engine speed at 3600.
The governor control mechanism features two operator controlled levers. The diesel
engine RUN lever places tension on a spring attached to the governor lever. The
tension places the governor lever in a position to allow fuel flow to the fuel injector
for diesel engine start up and to allow the diesel engine to continue running after
start up.
The diesel engine shutdown or STOP lever is operated by either depressing the red
STOP lever or by the low oil pressure shutdown system. When depressed, the lever
trips the RUN lever releasing the tension on the governor spring which places the
governor lever in a no fuel or stop position. This action shuts off fuel flow to the fuel
injector stopping the combustion process and shutting down the diesel engine
