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 TM 55-1905-220-14-4
3-24. INSTRUMENT PANEL - MAINTENANCE.INSTRUCTIONS
The instrument panel consist of an engine oil pressure gage, a marine gear oil pressure gage, water
temperature gage, and an electrical tachometer. The throttle control and engine starting and stopping controls
are mounted in various locations.
a. Engine Oil Pressure Gage.
The oil pressure gage registers the pressure of the lubricating oil in the engine. As soon as the engine is
started, the oil pressure gage should start to register. If not, the engine should be stopped and the cause of the
low oil pressure determined and corrected before the engine is started again.
b. Marine Gear Oil Pressure Gage.
The oil pressure gage registers the pressure of the lubricating oil in the engine (marine gear). As soon as
the engine is started, the oil pressure gage should start to register. If not, the engine should be stopped and the
cause of the low oil pressure determined and corrected before the engine is started again.
c. Water Temperature Gage.
The engine coolant temperature is registered on the water temperature gage.
d. Tachometer.
The tachometer receives an electrical signal from a transmitter on the engine, and registers the speed of
the engine in revolutions per minute (rpm).
e. Engine Starting Motor Switch
The engine starting motor switch is used to energize the starting motor. As soon as the engine starts, the
switch is released. The starting switch is mounted on the instrument panel with the contact button extending
through the front face of the panel.
3-618
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