(k)
Correctly put the nut on the outboard end of the scavenge tube. 1) Connect the nut to the tube with the thrust wire.
CAUTION: HOLD THE SCAVENGE TUBE (REAR) AT THE WRENCHING FLATS WHEN
_______ YOU TIGHTEN THE TUBE NUT. IF YOU DO NOT USE THE WRENCHING FLATS, YOU CAN CAUSE TWIST DAMAGE TO THE TUBE ASSEMBLY.
(l)
Connect the nut, threads lubricated with antigalling compound (PWA 586), to the No. 4 bearing scavenge tube (rear). 1) Tighten the nut to 200-225 pound-inches (22.597-25.422
newton-meters).
2) Install lockwire.
(m)
Correctly put the No. 4 bearing scavenge tube heat shields around the inboard end of the tube. 1) Install lockwire through the eyelets in the heat shield.
S 412-019-N00
(20)
Install a clean No. 4 bearing (oil) pressure tube as follows (Fig. 202, Sheet 2).
(a)
Remove the covers from the opening.
(b)
Install the No. 4 bearing tube guide on the No. 4 bearing pressure tube.
(c)
Install the pressure tube, with the straight end first, into the opening in the exhause case inner wall and through the strut at approximately the 11:00 o'clock location.
(d)
Connect the tube nut detail, lubricated with engine oil, to the adapter on the rear inner flange of the exhaust case at the
1:30 o'clock position.
1) Tighten the nut with your hand.
(e) Install the two bolts, lubricated with engine oil, to attach the tube guide to the inner wall of the case. 1) Tighten the bolts with your hand.
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ALL ú ú N01 Page 217 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(f)
Apply air at a minimum pressure of 10 psig (68.9 kPa) to the outboard end of the tube.
(g)
Make sure that air flows through the oil nozzle.
(h)
Air leaks are permitted, because this is not a test.
(i)
If the airflow is blocked, remove and install the No. 4 bearing oil pressure tube and the No. 4 bearing oil nozzle and transfer tube. 1) Tighten the two bolts that hold the tube guide to 75-85
pound-inches (8.474-9.604 newton-meters). 2) Install lockwire.
(j)
Use a wrench to hold the adapter while you torque the tube nut to 320-350 pound-inches (36.155-39.545 newton-meters). 1) Install lockwire.
(k)
Correctly put the nut on the outboard end of the tube. 1) Connect the nut to the tube with the thrust wire.
CAUTION: HOLD THE PRESSURE TUBE (UPPER) AT THE WRENCHING FLATS WHEN
_______ YOU TIGHTEN THE TUBE NUT. IF YOU DO NOT USE THE WRENCHING FLATS, YOU CAN CAUSE TWIST DAMAGE TO THE TUBE ASSEMBLY.
(l)
Connect the nut, threads lubricated with antigalling compound (PWA 550), to the No. 4 bearing oil pressure tube. 1) Tighten the nut to 200-225 pound-inches (22.597-25.422
newton-meters).
2) Install lockwire.
(m)
Correctly put the No. 4 bearing scavenge tube heat shields (front and rear) around the inboard end of the tube. 1) Install lockwire through the eyelets to hold the heat
shield.
S 412-020-N00
(21)
Install the No. 4 bearing cover and the shield (AMM 72-54-05/401).
(22)
Install the turbine exhaust plug (AMM 78-11-02/401).
S 412-024-N00
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S 412-023-N00
(23)
Close the Core Cowl panels (AMM 71-11-06/201).
S 442-022-N00
(24)
Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
S 712-021-N00
(25)
Do the test of the external oil tubes that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).
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