(3)  
Open the left core cowl panel (AMM 71-11-06/201).

 S 014-025-N00
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the left thrust reverser (AMM 78-31-00/201).

 S 494-026-N00

 (5)  
Put the access platform in its position.

 E.  
Removal of the No. 3 Bearing Compartment Breather Restrictor Valve (Fig. 401).

 NOTE: You will find the valve (3) attached to the left front side of the
____ main gearbox. It is at the approximate 8 o'clock position.
 S 424-027-N00
 (1)  
Remove the valve (3) with the steps that follow:

 (a)  
Remove the lockwire from the tube nut on the air supply tube (6). 1) The air supply tube (6) is attached to the No. 3 breather

 and restrictor valve.

 (b)  
Disconnect the tube nut (6) from the restrictor valve (3).

 (c)  
Remove the three bolts (1) which attach the No. 3 Bearing breather tube (2) to the restrictor valve (3).

 (d)  
Remove the face seal (7).

 (e)  
Remove the three bolts (4) that attach the valve (3) to the deoiler.

 (f)  
Remove the restrictor valve (3) from the gear box.

 S 494-028-N00
 CAUTION: INSTALL PROTECTION COVERS ON ALL OPENINGS AS SOON AS POSSIBLE.
_______ IF YOU DO NOT INSTALL THE PROTECTION COVERS, DAMAGE TO THE ENGINE CAN OCCUR.
 (2)  Make sure you install all necessary protection covers to the openings.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. PHASE 3 ENGINES POST-SB-75-95 ú

 79-21-11
 ú ú N01 Page 402 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1.  BOLT (3 LOCATIONS)
. 2.  BREATHER TUBE FOR
THE NO. 3 BEARING

SEE A
7.  FACE SEAL
3.  BREATHER RESTRICTOR VALVE FOR THE NO. 3 BEARING COMPARTMENT
6.  AIR SUPPLY TUBE FOR
THE NO. 3 BEARING
BREATHER VALVE

4.  
BOLT (3 LOCATIONS)

5.  
PACKING

DEOILER
FWD
A
G-00668 (0000)
No. 3 Bearing Compartment Breather Restrictor Valve Installation
Figure 401

C19595
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. PHASE 3 ENGINES POST-SB-75-95 ú

 79-21-11
 ú ú N01 Page 403 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TASK 79-21-11-424-029-N00
 3. No. 3 Bearing Compartment Breather Restrictor Valve Installation
________________________________________________________________
 A. Equipment
 (1)  
Access Platform

 (2)  
M303, M305, or M307 Bergen Mechanical Crimper
 Bergen Cable Technologies Inc
 170 Gregg St

 P.O.
 Box 1300
 Lodi, NJ 07644-9982

 B.
Consumable Materials

 (1)  
D00137 Engine Oil - PWA 521

 (2)  
D00405 Compound, Antigalling - PWA 550-3

 (3)  
G02332 Ferrule, Safety Cable (P05-292)

 (4)  
G02334 Lockwire, (P05-289) 0.032 inch (0.813 mm) - AS3214-02

 (5)  
G02335 Cable, Safety (P05-291)

 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Bolt | TBD | | TBD | | | 3 | Valve | | | TBD | | | 4 | Bolt | | | TBD | | | 5 | Packing | | | TBD | | | 7 | Face Seal | | | TBD | 2......…........…...................................…..........….....….........1
 D. References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels
　
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