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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
1. Oil Temperature Indicating System Test
A. General
(1)
The oil temperature indicating system test is performed to ensure operational integrity of the oil temperature bulb, electrical wiring, and the oil temperature indicator.
(2)
The system test is accomplished by applying simulated engine oil temperatures to the oil temperature bulb, taking the temperature readings with a master thermometer, and comparing these with the temperatures observed on the oil temperature indicator.
(3)
An additional test of the oil temperature indicator may be performed by substituting a test indicator for the airplane indicator and comparing the temperature readings of the two indicators. See 79-34-11, Oil Temperature Indicator -Adjustment/Test.
B. Equipment and Materials
(1)
Unbreakable Master Thermometer - calibrated in degrees centigrade
(2)
Variable Temperature Oil Bath
C. Prepare to Test Oil Temperature Indicating System
(1)
Connect electrical power to airplane.
(2)
Open applicable Oil Temperature and Pressure circuit breaker on main load control panel (P6).
CAUTION: FAILURE TO OPEN CIRCUIT BREAKER BEFORE REMOVING OIL TEMPERATURE BULB ELECTRICAL CONNECTOR MAY RESULT IN DAMAGE TO OIL TEMPERATURE INDICATOR.
(3)
Open left side cowl panel.
D. Test Oil Temperature Indicating System
(1)
Remove lockwire from oil temperature bulb electrical connector on fuel oil cooler and remove connector from bulb. (See figure 501.)
(2)
Remove oil temperature bulb from fuel oil cooler outlet fitting.
(3)
Cap fuel oil cooler outlet fitting to prevent entry of foreign matter into system.
(4)
Connect electrical connector to oil temperature bulb.
(5)
Close applicable Oil Temperature and Pressure circuit breaker on panel P6.
(6)
Immerse sensing element portion of master thermometer and oil temperature bulb to top of attaching threads in hot oil bath.
(7)
Regulate oil bath to several different temperatures and observe readings on master thermometer and oil temperature indicator. Check that readings agree within ± 5°C.
(8)
Open applicable Oil Temperature and Pressure circuit breaker on panel P6.
(9)
Remove oil temperature bulb from oil bath.
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H29452
Oil Temperature Indicating System Test 501
79-34-0 Figure 501 May 15/69
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(10)
Disconnect electrical connector from oil temperature bulb. Remove cap from fuel oil cooler outlet fitting and install temperature bulb in fitting. (See figure 501.)
(11)
Install electrical connector on oil temperature bulb and lockwire to boss on fuel oil cooler fitting.
(12)
Close left side cowl panel.
(13)
Close applicable Oil Temperature and Pressure circuit breaker on panel P6.
(14)
If no longer required, remove electrical power.
NOTE: The first time that engine is operated after performing this test, check to ensure oil temperature indications are normal and no leakage occurs around oil temperature bulb fitting on fuel oil cooler.
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OIL TEMPERATURE INDICATOR - ADJUSTMENT/TEST
1. Oil Temperature Indicator Test
A. General
(1) Testing of the oil temperature indicator may be performed by replacing the airplane indicator with a test indicator. The readings of the two indicators with external power applied to the system may then be compared.
B. Equipment and Materials
(1) Temperature Test Indicator - temperature scale in centigrade from -70oC to +150oC. (Lewis Engineering Company, Naugatuck, Connecticut, Model 162C7 or equivalent.)
C. Test Oil Temperature Indicator
(1)
Connect external electrical power to airplane (or use APU electrical power).
(2)
Close applicable Oil Temperature and Pressure circuit breaker on panel P6.
(3)
Read oil temperature on airplane indicator.
(4)
Open Oil Temperature and Pressure circuit breaker on panel P6 and observe indicator reading. Indicator needle should return to normal no-power (down scale) position. Close circuit breaker.
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