(d)  
If the pointer does not move in a downscale direction when the OIL QTY TEST switch is pressed, troubleshoot the system (Ref 79-31-0, page 101).

(e)  
Add 3.5 gallons of oil to the tank.

CAUTION:  EITHER HYDROCARBON OR SYNTHETIC ENGINE OILS MAY BE USED IN THE JT8D ENGINE, BUT THE OILS MAY NOT BE MIXED PER PRATT & WHITNEY STANDARDS. IF OILS WHICH ARE NOT COMPATIBLE ARE MIXED, THEY CAN REACT AND CAUSE DAMAGE TO THE ENGINE.

(f)  
Adjust the screw marked "F" on the back of the indicator until the pointer reads 3.5 gallons. Press the OIL QTY TEST switch momentarily and release. Readjust the "F" screw if it is necessary to return the pointer to 3.5 gallons.

NOTE:  When adjusted in this manner, the oil quantity indicator displays the useable quantity of oil in the tank. The remaining 1.3 gallons is not available to the engine and is not measured by the indicator.

(g)  
Pull the circuit breaker C280 or C281 on the P6 Load Control Panel for the oil quantity indicating system being adjusted. 

(h)  
Finish the servicing procedure for the engine oil tank (Ref 12-13-1/201).

(i)  
Put the oil quantity indicator in the center instruments panel.

(j)  
Close the left cowl panel (Ref 71-11-11 R/I) and remove the power from the airplane if it no longer needed.

500 
79-31-02 Page 510  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

OIL QUANTITY TANK UNIT - REMOVAL/INSTALLATION
1. Remove Oil Quantity Tank Unit
A. Open left side cowl panel.
B. Open applicable oil quantity circuit breaker, on circuit breaker panel P6.
C. Drain engine oil tank. (See 79-11-21.)
D. Remove electrical connector from tank unit electrical receptacle. (See figure 401.)

H29459
500  Oil Quantity Tank Unit Installation 
Aug 15/69  Figure 401  79-31-11 
Page 401 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

E.  Support tank unit and remove six bolts, nuts, and washers retaining tank unit to oil tank flange.
F.  Remove tank unit and O-ring.
2.  Install Oil Quantity Tank Unit
A.  With a new O-ring inserted on tank unit, locate unit on oil tank flange with electrical connector facing aft.
B.  Install three shortest bolts, light washers and nuts retaining tank unit to oil tank at two outboard and forward center bolt hole locations.
C.  Position a standard washer in spot face at forward inboard bolt hole location on tank unit. Install bolt, light washer and nut securing bonding jumper and tank unit to oil tank flange.
D.  Insert bolts through two bolt holes at aft end of flange. Position electrical wiring bracket over protruding ends of bolts and install light washers and nuts.
E.  Connect electrical connector to tank unit electrical receptacle.
F.  Calibrate oil quantity indicating system. (See 79-31-0).
500 
79-31-11 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/68 

OIL PRESSURE INDICATING SYSTEM - DESCRIPTION AND OPERATION
1.  General
A.  The oil pressure indicating system shows the engine oil pressure on indicators in the control cabin. The components of the system for each engine are an oil pressure transmitter and an indicator (Fig. 1).
B.  The oil pressure transmitter senses oil pressure in the external pressure oil manifold and also senses ambient cowl pressure. The difference between these two pressures is measured and converted into an electrical signal which actuates the oil pressure indicator.
C.  A union orifice (restrictor) is installed in the external pressure oil manifold for surge protection and to reduce indicator fluctuation.
2.  Oil Pressure Transmitter
A.  The oil pressure transmitter contains a diaphragm connected to a synchro transmitter. One side of the diaphragm senses oil pump output pressure in the bearing oil line. The other senses ambient cowl pressure. The difference between the two pressures positions the diaphragm and, in turn, the rotor of the synchro transmitter. The movement of the synchro transmitter rotor induces electrical signals in the transmitter stator. These signals are transmitted to the oil pressure indicator.
B.  The oil pressure transmitter is shock mounted at approximately the 10 o'clock position on the left side of each engine (Fig. 1).
3.  Oil Pressure Indicator
A.  The oil pressure indicator contains a synchro receiver, a gear train, and a pointer to indicate oil pressure. The electrical signals received from the oil pressure synchro transmitter are induced on the stator of the synchro receiver. This causes the receiver rotor to assume a position corresponding to the position of the synchro transmitter rotor. The receiver rotor drives the indicator pointer through the gear train.
　
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