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NO. 1.5 BEARING SEAL
NO. 2 FRONT BEARING SEAL
NO. 1, 1.5, AND 2 BEARING COMPARTMENT
SCAVENGE OIL PICK-UP
NO. 2 BEARING
NO. 2 REAR BEARING SEAL
FLOW RESTRICTOR
LAST CHANCE OIL STRAINER
NO. 3 FRONT BEARING SEAL
NO. 3 BEARING
NO. 3 REAR BEARING SEAL
NO. 4 BEARING SEAL
NO. 4 BEARING
NO. 4 BEARING COMPARTMENT BREATHER
AIR/SCAVENGE OIL PICK-UP
ENGINE FUEL/OIL COOLER BYPASS VALVE
ENGINE AIR/OIL HEAT EXCHANGER BYPASS VALVE
OIL QUANTITY TRANSMITTER
OIL SYSTEM PRESSURE (REGULATOR) RELIEF VALVE
NO. 3 BEARING OIL TEMPERATURE THERMOCOUPLE
PROBE
MAGNETIC CHIP DETECTOR
DEOILER
MASTER MAGNETIC CHIP DETECTOR
MAIN OIL FILTER PRESSURE RELIEF VALVE
27 27
18 27 33
30 27 29 27 27 28
28 31 28
26 2820 32
25
19

21 27
23
7
22
1.

24
2.

3.

4.
10
395. 13 15
9
16 17
6.

35
7.

14 8.
9.

8
10.
40
11
11.

12.

13.
36
14.

15.

16.
12 17.
18.
40
19.

6  20.
21.

2
22.

41
23.

AIR24.
OVERBOARDBREATHER
38
25.
1 37
26.

27.

28.
LUBRICATION SYSTEM
29.
30.
PRESSURE OIL
5
31.
43
32.
SCAVENGE OIL
4
33.
34.
COMBINED BREATHER
AIR AND SCAVENGE OIL

35. PRESSURE OIL PUMP
36.
3
42 37.
INLET OIL38.
IDG OIL 39.
40.
BREATHER AIR
41.

42.

43.
Oil System Schematic
Figure 1

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 79-00-00
 ALL  ú ú N01 Page 2 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////
A / PW4000 SERIES /
747-400 / ENGINES /FAULT ISOLATION/MAINT MANUAL ////////////////////////
OIL
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
CHIP DETECTORS - MAGNETIC, ENG 1  4  6  415 AND 416, LEFT AND RIGHT THRUST REVERSER HALVES, HPC CASE, MAIN GEARBOX, FWD FACE  79-21-01 
CHIP DETECTORS - MAGNETIC, ENG 2  4  6  THRUST REVERSER HALVES, HPC425 AND 426, LEFT AND RIGHT CASE, MAIN GEARBOX, FWD FACE  79-21-01 
CHIP DETECTORS - MAGNETIC, ENG 3  4  6  THRUST REVERSER HALVES, HPC435 AND 436, LEFT AND RIGHT CASE, MAIN GEARBOX, FWD FACE 79-21-01
CHIP DETECTORS - MAGNETIC, ENG 4  4  6  THRUST REVERSER HALVES, HPC 445 AND 446, LEFT AND RIGHT CASE, MAIN GEARBOX, FWD FACE 79-21-01
CIRCUIT BREAKER - 1  FLT COMPT, P6 
OIL PRESS ENG 1, C49 1  6D1  * 
OIL PRESS ENG 2, C50 1  6D2  * 
OIL PRESS ENG 3, C51 1  6D3  * 
OIL PRESS ENG 4, C52  1  6D4  * 
COOLER - FUEL OIL, AND BYPASS VALVE, ENG 1  3  1  415, LEFT THRUST REVERSER HALF, HPC CASE  79-21-01 
COOLER - FUEL OIL, AND BYPASS VALVE, ENG 2  3  1  HPC CASE 425, LEFT THRUST REVERSER HALF,  79-21-01 
COOLER - FUEL OIL, AND BYPASS VALVE, ENG 3  3  1  HPC CASE435, LEFT THRUST REVERSER HALF,  79-21-01
COOLER - FUEL OIL, AND BYPASS VALVE, ENG 4  3  1  HPC CASE 445, LEFT THRUST REVERSER HALF,  79-21-01
FILTER ELEMENT - MAIN OIL, ENG 1  2  1  MAIN GEARBOX, FWD FACE415, LEFT THRUST REVERSER HALF,  79-21-05 
FILTER ELEMENT - MAIN OIL, ENG 2  2  1  MAIN GEARBOX, FWD FACE 425, LEFT THRUST REVERSER HALF,  79-21-05 
FILTER ELEMENT - MAIN OIL, ENG 3 2  1  MAIN GEARBOX, FWD FACE435, LEFT THRUST REVERSER HALF,  79-21-05 
FILTER ELEMENT - MAIN OIL, ENG 4 2  1  MAIN GEARBOX, FWD FACE 445, LEFT THRUST REVERSER HALF,  79-21-05 
ENG 1HEAT EXCHANGER - ENGINE AIR/OIL, AND VALVE,  1  1  INTERMEDIATE CASE415, LEFT THRUST REVERSER HALF,  79-21-09 
ENG 2HEAT EXCHANGER - ENGINE AIR/OIL, AND VALVE,  1  1  INTERMEDIATE CASE425, LEFT THRUST REVERSER HALF,  79-21-09 
ENG 3HEAT EXCHANGER - ENGINE AIR/OIL, AND VALVE,  1  1  INTERMEDIATE CASE435, LEFT THRUST REVERSER HALF,  79-21-09 
　
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