(d)
Close applicable oil quantity circuit breaker on panel P6.
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(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)
Disconnect tank unit and connect variable capacitance tester and harness into oil quantity indicator circuit per figure 501.
(b)
Adjust tank unit section of tester to 22.30 MMF. Adjust tester compensator section to
108.80 MMF.
NOTE: These settings must not be altered until system adjustment is completed.
(c)
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.
(d)
Remove adapter harness and tester and reconnect tank unit electrical plug.
(e)
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 1.3 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 figure 501.
NOTE: Tester reading must not be changed from the settings established in step B.(3)(b) above.
(h)
Check that indicator dial pointer reads zero. Readjust indicator E screw if necessary to obtain this indication.
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H29518 H29522
Oil Quantity Indicating System Test Circuits 500
79-31-0 Figure 501 (Sheet 1) Aug 15/67
Page 506
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500 Oil Quantity Indicating System Test Circuits
Aug 15/67 Figure 501 (Sheet 2) 79-31-0
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(i) Disconnect tester and harness, reconnect tank unit. Check that indicator reads 3.0
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.
C. Oil Quantity Indicating System Adjustment (Dry Oil Tank Method)
NOTE: This procedure may be used when it is desired to adjust the oil quantity indicating system without adding oil to an empty oil tank. Subsequent to performing a dry tank adjustment, a test should be made when servicing the tank to confirm accurate operation.
(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 Operation, 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
(2)
Prepare Oil Quantity Indicating System for Adjustment
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