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 TM 55-1905-220-14-5
3-65.3. AUTOMATIC ELECTRICAL SHUT-DOWN SYSTEM (Cont).
a. The electrically operated automatic shut-down includes a lubricating oil pressure switch, a water
temperature switch and a shut-down solenoid.
Automatic Shut-Down Wiring Diagram
b. There is an overspeed governor switch in conjunction with the above electrical shut-down system.
See paragraph 3-79.
c. A time-delay hot wire relay is introduced into the electrical shut-down system to prevent the fuel oil
pressure switch from closing before the lubricating oil pressure switch opens, which would cause a shut-down of
the engine.
d. When the engine is not running, the fuel oil pressure switch is open, the lubricating oil pressure switch
is closed and the water temperature switch is open.
e. After starting the engine, the lubricating oil pressure switch contacts are open when the oil pressure is
10 psi (68.95 kPa) or higher (approximately 700 rpm), and the fuel oil pressure switch contacts are closed when
the fuel oil pressure is 20 psi (137.90 kPa) or greater, (approximately 800 rpm). The electrical circuit of this
system is so arranged that the closing of the fuel pressure switch energizes the entire system and at any time
thereafter, the closing of either the lubricating oil pressure switch, or water temperature switch, will cause the
shut-down to operate. When the engine starts, the fuel pressure increases so rapidly that the fuel pressure
switch
3-1148
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