(b)
Adapter Harness Test Set - Boeing F72731
(c)
Approved engine oil
(2) Prepare Oil Quantity Indicating System for Adjustment
(a)
Open left side cowl panel of applicable engine.
(b)
Open oil tank drain valve and allow oil to drain for five minutes. Close drain valve.
NOTE: If engine has been shut down for more than 30 minutes, open engine gearbox drain plugs to assure complete drainage. Replace plugs and lockwire after draining.
If a new tank unit has been installed, it is not necessary to wet the probe in oil before adjusting system.
(c)
Connect electrical power to airplane.
(d)
Close applicable oil quantity circuit breaker on panel P6.
(3) Adjust Oil Quantity Indicating System
NOTE: Do not adjust the oil quantity indicating system during keying of an HF system transmitter. Keying of an HF system transmitter when the airplane is on the ground with entry doors open, and with service interphone cords and grounding straps connected may cause a shifting or fluctuation of the oil quantity indicator readings.
(a)
Adjust potentiometer screw marked "E," on back of oil quantity indicator, until indicator pointer reads zero.
NOTE: Push TEST SWITCH after each small increment of adjustment is made. Check that indicator pointer moves in a downward direction and returns to adjusted reading when switch is released.
(b)
Disconnect tank unit and connect variable capacitance tester and harness into oil quantity indicator circuit per Fig. 501.
(c)
Adjust variable capacitor in tester until oil quantity indicator pointer reads zero.
NOTE: This setting should not be altered until system adjustment is completed.
(d)
Remove adapter harness and tester and reconnect tank unit electrical plug.
(e)
Remove filler cap and add 4.3 U.S. gallons of oil to tank.
(f)
Adjust potentiometer screw marked "F," on back of oil quantity indicator, until indicator dial pointer reads 3.0 U.S. gallons. Push TEST SWITCH several times while making adjustment.
NOTE: When adjusted in this manner, the oil quantity indicator displays the usable quantity of oil in the tank. The remaining 1.30 U.S. gallons in the bottom of the tank is not available to the engine.
(g)
Disconnect tank unit and reconnect variable capacitance tester and harness into oil quantity indicator circuit per Fig. 501.
NOTE: Tester reading must not be changed from the settings established in step A.(3)(c) above.
(h)
Check that indicator dial pointer reads zero. Readjust indicator "E" screw if necessary to obtain this indication.
(i)
Disconnect tester and harness, reconnect tank unit. Check that indicator reads 3.0
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U.S. gallons. Readjust "F" screw if necessary to obtain this indication.
NOTE: Since there is interaction between the "E" and "F" adjustment screws, it is necessary to repeat the adjustments of each screw until their effect on each other is at a minimum.
(j)
Complete servicing of engine oil tank. Refer to Chapter 12, Engine Oil Tank Servicing.
(k)
Close left side cowl panel.
(l)
If no longer required, remove electrical power.
May 15/69 79-31-0
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. Oil Quantity Indicating System Adjustment (Wet Oil Tank Calibration with Tank Oil Under 38°C (100°F)
(1)
Equipment and Materials
(a)
Any of the following capacitance testers may be used: 1) Field Calibration Unit, Part No. 387016-1 or 387991-003, Simmonds Precision Products, Inc., Tarrytown, New York 2) Variable Capacitance Tester, Type 1429-A or MD-1, with current calibration chart, General Radio Co., West Concord, Massachusetts 3) Variable Capacitance Tester, Type HT-109, Honeywell Inc., Annapolis, Maryland (two required)
4) Capacitance - Type Liquid Quantity System Test Set, Model TF-20, Consolidated Airborne Systems Inc., Carle Place, Long Island, New York
(b)
Adapter Harness Test Set - Boeing F72731 or equivalent
(c)
Approved engine oil
(2)
Prepare Oil Quantity Indicating System for Adjustment
(a)
Open left side cowl panel.
(b)
Open oil tank drain valve and allow oil to drain for 30 minutes. Close drain valve.
NOTE: If engine has been shut down for more than 30 minutes, open engine gearbox drain plugs to assure complete drainage. Replace plugs and lockwire after draining.
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