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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
(REAR) SCAVENGE TUBE NO. 4 BEARING
THRUST WIRE TUBE (OUTER) OIL SCAVENGE NO. 4 BEARING NUT
OF TEC SURFACE OUTER
(PARTS SHOWN FROM A DIFFERENT ANGLE) F
WIRE LOCKWIRE TOGETHER TWIST ENDS OF TUBE (OUTER) OIL SCAVENGE NO. 4 BEARING SCAVENGE TUBE NO. 4 BEARING (FRONT) HEATSHIELD
EXAMPLE OF LOCKWIRE INSTALLATION ON HEATSHIELD SCAVENGE TUBE NO. 4 BEARING (REAR) HEATSHIELD ADAPTER
G
NO. 4 BEARING TUBE GUIDE
BOLT
H L-A3517(0292)
No. 4 Bearing Oil Components - Removal and Installation
Figure 202 (Sheet 3)
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A47181
SEE A
A
A COMPARTMENT NO. 4 BEARING A
OIL SUPPLY HOLE (8 LOCATIONS)
OIL DRAIN HOLE (11 LOCATIONS)
A-A
L-A8367 (0000) No. 4 Bearing Compartment - Inspection for Coke Figure 203
B78840
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(b) Remove the keywashers and bolts that attach the No. 4 bearing oil scavenge (inner) tube to the housing inner diameter at the
7:30 o'clock location.
1) Remove the No. 4 bearing oil scavenge tube.
2) Discard the gasket.
S 012-009-N00
(9) Remove the No. 4 bearing (oil) pressure tube as follows (Fig. 202, Sheet 2):
CAUTION: HOLD THE PRESSURE TUBE (UPPER) AT THE WRENCHING FLATS WHEN
_______ YOU LOOSEN THE TUBE NUT. IF YOU DO NOT USE THE WRENCHING FLATS, YOU CAN CAUSE TWIST DAMAGE TO THE TUBE ASSEMBLY.
(a)
Remove the lockwire to disconnect the No. 4 bearing (oil) pressure tube from the No. 4 bearing oil pressure tube (upper) at the 11 o'clock position between Flanges R and S.
(b)
Remove the thrust wire.
(c)
Remove the nut from the pressure tube.
(d)
Remove the lockwire that attaches the No. 4 bearing pressure tube heat shield to the tube. 1) Remove the heat shield (front and rear) from the tube.
(e)
Remove the lockwire and bolts that attach the No. 4 bearing tube guide to the case.
(f)
While you hold the adapter with a wrench, disconnect the nut that attaches the tube to the adapter.
(g)
Move the tube radially to the inside to remove it from the case.
(h)
Install covers on the openings.
S 012-027-N00
(10) Remove the No. 4 bearing oil scavenge tube (outer) (Fig. 202, Sheet 3).
CAUTION: HOLD THE SCAVENGE TUBE (REAR) AT THE WRENCHING FLATS WHEN
_______ YOU LOOSEN THE TUBE NUT. IF YOU DO NOT USE THE WRENCHING FLATS, YOU CAN CAUSE TWIST DAMAGE TO THE TUBE ASSEMBLY.
(a) Remove the lockwire to disconnect the No. 4 scavenge tube (outer) from the No. 4 bearing oil scavenge tube (rear) are the 10 o'clock position between flanges R and S.
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