TM 55-1520-240-23-7
8-1
ENGINE INSTRUMENTS
(Continued)
8-1
ENGINE OIL PRESSURE INDICATING SYSTEM
Description
The engine oil pressure indicating system is a differential
pressure synchro system. It measures and indicates the
pressure of oil circulating within the engine. There is a
separate system for each engine. Each system consists
of an indicator and a pressure transmitter synchro. The
transmitter is located in the engine nacelle. The indicator
is on the center instrument panel.
NO BREAK - WORK HARDER
The engine oil pressure indicator, a synchro receiver,
indicates oil pressure as psi. The indicator is calibrated
from 0 to 200 psi. Electrical connections are made
through a connector at the rear of the clamp mounted
instrument.
NO BREAK - WORK HARDER
The transmitter, a synchro transmitter, is linked to the
engine oil system through a flexible hose, coupling and
snubber. Pressure is applied to a diaphragm in the
transmitter causing the transmitter rotor to turn. This
causes a change in the stator voltage in the indicator,
that causes the stator rotor to turn, moving the pointer
to the correct pressure indication. The snubber reduces
the effect of pressure surges on the system. A zero
adjustment is included on the transmitter.
8-7
