3.  Oil Tank Drain Valve
A.  The oil tank drain valve is located at the bottom of the oil tank. The handle is spring-loaded to the valve closed position. Manually rotating the handle 90 degrees in a clockwise direction opens the valve allowing the oil to drain from the tank. The handle is locked in the valve open position by a ball detent arrangement. Counterclockwise movement of the handle unseats the balls form the detents and allows the spring tension to return the handle to the valve closed position. (See figure 1).

H29473
Oil Tank Drain Valve  500 
79-11-0Page 2   Figure 1 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/68 

ENGINE OIL TANK - REMOVAL/INSTALLATION
P&W 79-11-1 page 401 Sep 15/63
1.  Prepare to Remove Engine Oil Tank
A.  Open left side removable cowl panel.
B.  Drain oil from tank prior to removal by opening drain valve on bottom of tank. Close valve after draining.
2.  Remove Engine Oil Tank
A.  Disconnect electrical connector from oil quantity tank unit on underside of oil tank. Remove two clamps retaining tank unit electrical lead to tank unit mounting flange.
B.  Remove bolt and disconnect electrical bonding jumper from tank.
C.  Disconnect scupper drain line (11, figure 401) at oil filler sump cavity fitting (5).
D.  Remove three locknuts (8) and washers (7) holding tank (13) to gearbox (1).
E.  Support tank and remove locknut (16) and washer (15), if installed from tank strap turnbuckle bolt (4) and open strap (3).
F.  Pull tank straight forward off gearbox studs (2) and remove from engine.
CAUTION:  USE CARE TO AVOID DAMAGE TO TRANSFER TUBES BETWEEN TANK AND GEARBOX.
G.  Remove three transfer tubes (9) and cover openings.
3.  Install Engine Oil Tank
A.  Install vibration damping grommet and bushing (6, figure 401) in each of three oil tank lugs.
B.  Install four new packings (10) on each of three straight transfer tubes (9). Coat packings lightly with petrolatum.
C.  Install three transfer tubes (9) in their openings in front of gearbox (1).
500 
Nov 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  79-11-11 Page 401 

H29483
Engine Oil Tank Installation  500 
79-11-11  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

P&W 79-11-1 page 401 Sep 15/63
D.  Position tank (13), drain valve (12) down, in front of gearbox (1). Move tank aft into position, engaging bushings over gearbox studs (2) and mating transfer tubes (9) with openings in rear of oil tank.
CAUTION:  USE EXTREME CARE TO AVOID DAMAGING OR DISRUPTING TUBES AND/OR PACKINGS.
E.  Install three washers (7) and locknuts (8) on gearbox studs (2).
F.  Wrap oil tank strap (3) around oil tank (13).
G.  Install spherical washer (15) and locknut (16) on strap turnbuckle bolt (4). Tighten locknut until just before it begins to tension oil tank strap (3). Check torque, then continue tightening until 3 to 5 pound-inches above the checked torque is reached. Strap turnbuckle bolt (4) threads must be flush or protrude above locknut (16).
NOTE:  For engines incorporating the two piece construction strap, the spherical washer is not required.
H.  Connect scupper drain line (11) to oil filler sump cavity fitting (5).
I.  Connect the electrical bonding jumper to oil tank using bolt.
J.  Install two clamps retaining tank unit electrical lead (14) to tank unit mounting flange.
K.  Connect electrical connector to oil quantity tank unit on underside of oil tank.
L.  Service oil tank to operational level. Refer to Chapter 12, Engine Oil Tank Servicing.
M.  Close left side removable cowl panel.
N.  Test engine in accordance with Power Plant Repair Reference Table, Test A and allow oil temperature to reach 40°C during test. Refer to Chapter 71, Power Plant.
Nov 15/72 79-11-11 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
P&W 79-21-1 page 401 Sep 15/63

OIL TANK DRAIN VALVE - REMOVAL/INSTALLATION
1.  Prepare to Remove Oil Tank Drain Valve
A.  Open left side cowl panel.
B.  Open tank drain valve and drain oil from engine oil tank. Close drain valve after draining.
2.  Remove Oil Tank Drain Valve (See figure 401.)
A.  Loosen checknut on drain valve.
B.  Remove drain valve from oil tank drain boss insert on bottom of tank.
3.  Install Oil Tank Drain Valve (See figure 401.)
　
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