Oil Temperature Gauge Calibration; Oil Temperature Gauge Troubleshooting - Piper PA-44-180 SEMINOLE Maintenance Manual

OIL TEMPERATURE GAUGE.
The oil temperature indicator is mounted in the instrument cluster or in an adjacent configuration on the
instrument panel. This instrument will provide a temperature indication of the engine oil in degrees Fahrenheit.
The instrument has a temperature bulb located in the oil screen assembly, on the engine accessory section.
With electrical power off, each gauge pointer should center ±1/2 a needle width on the
dot. When positive 14 VDC is applied to the bus, the gauge should indicate the
approximate known temperature.
TROUBLESHOOTING OIL TEMPERATURE GAUGE.
TROUBLE
Instrument fails to show
any reading.
Excessive error.
Pointer fails to move
as engine is warmed up.
Dull or discolored
marking.
REMOVAL AND REPLACEMENT.
Refer to the General section of Chapter 77 for Removal of cluster mounted instruments.
OIL TEMPERATURE GAUGE CALIBRATION. (PA-44-180 S/N 44-95001 and up)
A calibration chart has been included for use in verifing that the suspected faulty gauge is within tolerance.
Actual recalibration of the gauge must be performed by the manufacturer or an approved instrument repair
facility.
1. With the instrument installed in the aircraft, the aircrafts' power connected (14 VDC) and the ground
connected.
2. Remove the connection to the terminal marked SEND and connect a specified amount of resistance as
indicated on the chart, by use of a fixed resistor or a test unit capable of simulating the resistance indicated
on the chart (Power Resistor Decade Box).
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
CHART 7903. OIL TEMPERATURE GAUGE
CAUSE
Broken or damaged bulb.
Wiring open.
Improper calibration
adjustment.
Broken or damaged bulb
or open wiring.
Age.
3I7
REMEDY
Check engine unit and
wiring to instrument.
Replace instrument.
Check engine unit and
wiring.
Replace instrument.
Page 79-05
Revised: May 15, 1989
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