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 TM 55-1905-223-24-3
(c) Magnetic Pickup. The magnetic pickup is an electromagnetic device that is mounted in the
flywheel housing. When the flywheel gear teeth pass the pickup, an alternating current (ac) voltage is induced,
one cycle for each gear tooth. The pickup then sends the electrical signal to the remote governor control.
(d) Governor Control and Overspeed Switch. The governor control is an all electric solid-state
module that compares the pulses from the magnetic pickup, which are directly proportional to the engine
speed, with the speed control reference set point. A current output is supplied to the actuator on the fuel pump
that controls the fuel flow to the engine. The overspeed switch will shut down the generator set when maximum
rated rpm is exceeded.
(e) Shut Down Valve. An electric solenoid operated shutdown valve with manual override is used
on the fuel pump.
(2) PT Injectors. The injector provides a means of introducing fuel into each combustion chamber. It
combines the acts of metering, timing and injection.
(3) Fuel Lines and Connections. Fuel is supplied through lines to the cylinder heads. A common drain
line returns fuel not injected to the supply tank. Fuel connectors are used between the inline engine cylinder
heads to bridge the gap between each supply and drain passage.
c. Lubricating System. The diesel engine is pressure lubricated. Pressure is supplied by a gear-type oil
pump located on the side of the engine.
(1) System Operation. Oil is drawn into the pump through an external oil line connected to the oil pan
sump. A screen in the sump filters the oil. Oil is drawn from the pan by the pump, out through a full-flow filter
and circulates back into the block.
(2) Lubricating Oil Flow. Oil flows from the pump to the filter/cooler, then flows to an oil header
through internal drillings in the gear case. The oil header, drilled full length of block, delivers oil to moving
parts within the engine. Oil pipes carry oil from the camshaft to upper rocker housings. Drillings through the
block, crankshaft, connecting rods, and rocker levers complete the oil circulating passages.
d. Cooling System. The primary function of the cooling system is to remove the heat created by the
engine and its support components. The excess heat energy that is not removed by the cooling system is
carried away by exhaust gases and radiated into the atmosphere.
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