3.96 imperial gallons. If necessary, re-adjust the "F" screw to show 4.75 U.S. gallons or 3.96 imperial gallons.
(h)
On the tester, adjust the tank unit section to 63.6 MMF and check to see that the indicator reads 3.0 U.S. gallons士 1 pint. For indicators reading imperial gallons, set tank unit section to 70.83 MMF and check to see the indicator reads 3.0 imperial gallons士0.83 pints.
(i)
Disconnect the tester and test harness and connect the tank unit to the indicator.
(4)
Calibration Check
(a)
Remove the engine oil tank dip-stick (attached to tank filler cap) and determine the amount of oil remaining in the tank. Verify that the indicator reading agrees with the dip-stick determined value with 士 1 U.S. quart.
(b)
Return system to normal.
3. Oil Quantity Indicating System Test
A. Oil Quantity Indicating System Test (After Dry Oil Tank Adjustment)
(1)
Equipment and Materials
(a) Approved engine oil
(2)
Test Oil Quantity Indicating System
(a)
Open oil tank gravity fill port and add measured 1.3 +0.0/-0.l U.S. gallons of approved engine oil to oil tank.
(b)
Check that quantity indicator on engine instrument panel reads zero + one pint (one-half indicator dial division).
(c)
Add 3.0 U.S. gallons of oil to oil tank. Indicator should read 3.0 gallons + one pint.
(d)
Complete servicing of engine oil tank (Ref Chapter 12, Engine Oil Tank Servicing).
(e)
Close left side cowl panel.
(f)
If no longer required, remove electrical power.
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B. Oil Quantity Indicating System Insulation Test
(1)
Equipment and Materials
(a) Ohmmeter
(2)
Test Oil Quantity Indicating System Insulation
(a)
Open applicable oil quantity circuit breaker on panel P6.
(b)
Remove applicable oil quantity indicator from engine instrument panel and disconnect electrical plug.
(c)
Using ohmmeter, measure resistances at plug locations noted in Table 1. Resistances shall not be less than those specified.
(d)
Connect electrical plug to oil quantity indicator and instal1 indicator in instrument panel.
(e)
Close oil quantity circuit breaker on panel P6.
NOTE: Tank unit probe shall be dry and tank drained for this test. OIL QUANTITY INDICATING SYSTEM - ADJUSTMENT/TEST
PLUG PIN(S) MINIMUM INSULATION RESISTANCE - MEGOHMS
Pin 1 to Ground Pin 2 to Ground Pin 3 to Ground Pin 1 to Pin 2 Pin 1 to Pin 3 Pin 2 to Pin 3 1 1 1 3500 3000 10
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EFFECTIVITY
SIMMONDS PRECISION CAPACITANCE TESTER PSD60-1
1. General
A. The oil quantity indicating system adjustment/test is done to make sure that the tank unit, indicator, and system wiring are all functional. Adjustment of the indicator after installation is necessary to correct for differences in empty tank unit capacitance and for wiring capacitance.
B. The system adjustment should be checked at every oil change, whenever a tank unit or indicator is changed, and whenever the engine is changed.
C. Four adjustment procedures are provided:
(1)
Adjust the indicator with the oil drained from the tank at a temperature greater than 100°F (38°C).
(2)
Adjust the indicator with the oil drained from the tank at a temperature below 100°F (38°C).
(3)
Calibrate the indicator with the oil remaining in the tank.
(4)
Calibrate the indicator with the oil drained from the tank.
All the methods EXCEPT (4) use the Simmond PSD60-1 tester.
D. If the oil quantity indicating system is adjusted more than 30 minutes after engine shutdown, you must make sure that all the oil is drained from the system. Do this by opening the oil tank drain valve and removing the main oil drain plug from the bottom of the accessory drive gearbox housing. Failure to remove all the oil from the tank and the engine sump will cause an inaccurate indicator calibration and possibly overservicing of the oil quantity.
E. When calibrated using any of the above procedures, the oil quantity indicator will show the useable quantity of oil in the tank. Approximately 1.3 gallons of oil are in the engine sump. This oil is not useable by the engine and is not measured by the indicating system.
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