Technical data

13773-001
79-30
Page 1
INDICATING
1. DESCRIPTION
This section describes that portion of the oil system which is used to indicate the quantity, temperature,
and pressure of the oil. Components included are the oil filler cap/dipstick, oil pressure/temperature gage,
oil pressure sensor, and oil temperature sensor.
A 2¼” combination Oil Temperature and Oil Pressure indicator is mounted on the right instrument panel
immediately below the EGT/CHT indicator. The instrument is internally lighted. 28 VDC for instrument
operation is supplied through the 5-amp Engine Instruments circuit breaker on the Essential Bus.
The Oil Temperature pointer sweeps a scale marked from 75× F to 250× F in 25× F increments. The Oil
Temp indicator receives a temperature signal from a temperature sending unit mounted on the engine near
the left magneto.
The Oil Pressure pointer sweeps a scale marked from 0 psi to 100 psi. The Oil Pressure indicator receives
a pressure signal from a oil pressure sensor on the left side of the engine. Normally, oil pressure may drop
to 10 psi at idle but will be in the 30 - 60 psi range at higher RPM.
2. MAINTENANCE PRACTICES
A. Oil Filler Cap/Dipstick
An oil filler cap/dipstick is located at the rear of the engine on the top left side and is accessed through
the oil filler door on the upper cowling. The engine oil tank capacity is 8 quarts (7.57 L). Refer to 12-20
for approved engine oil specifications and servicing procedures.
B. Oil Pressure/Temperature Gage (See Figure 79-301)
(1) Removal - Oil Pressure/Temperature Gage
(a) Ensure BAT 1, BAT 2, and AVIONICS master switches are in off position.
(b) Pull ENGINE INSTRUMENT circuit breaker.
(c) Remove MFD. (Refer to 34-40)
(d) Remove cable connector from rear of indicator.
(e) Remove screws and washers attaching indicator to instrument panel.
(f) Remove indicator from airplane.
(2) Installation - Oil Pressure/Temperature Indicator
(a) Connect cable connector to indicator.
(b) Position indicator to instrument panel hole and install washers and screws.
(c) Install MFD. (Refer to 34-40)
(d) Reset ENGINE INSTRUMENTS circuit breaker.
(e) Perform Oil Pressure Check described in the airplane Operational Check. (Refer to 5-30)
C. Oil Pressure Sensor (See Figure 79-301)
CAUTION: Protect openings exposed as a result of removing sensor against entry of foreign mate-
rial by installing covers or sealing with tape.
(1) Removal - Oil Pressure Sensor
(a) Ensure BAT 1, BAT 2, and AVIONICS master switches are in off position.
(b) Pull ENGINE INSTRUMENT circuit breaker.
(c) Remove engine cowling. (Refer to 71-10)
(d) Disconnect sensor electrical connector.
(e) Remove sensor from engine fitting.
30 Nov 2000