P.O. Box 1300
 Lodi, NJ 07644-9982

 B.
Consumable Materials

 (1)  
D00390 Oil - Engine

 (2)  
G02332 Ferrule, Safety Cable (P05-292)

 (3)  
G02334 Lockwire, (P05-289) 0.032 inch (0.813 mm) - AS3214-02

 (4)  
G02335 Cable, Safety (P05-291)

 C.
Parts

 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Packing | 79-21-06 | 01 | 120 | | | 2 | Main Oil Filter Pressure Relief | | | 115 | | | | Valve | | | | | | 3 | Packing | | | 110 | 2......…........…...................................…...........….....…........1
 D. References
 (1)  
12-13-03/301, Engine - Servicing

 (2)  
71-00-00/501, Power Plant

 (3)  
78-31-00/201, Thrust Reverser System

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-21-06
 ALL  ú ú N01 Page 403 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
E. Access
 (1)  
Location Zone
 412 Engine 1 - Main Gearbox Fwd Face 8 o'clock
 422 Engine 2 - Main Gearbox Fwd Face 8 o'clock
 432 Engine 3 - Main Gearbox Fwd Face 8 o'clock
 442 Engine 4 - Main Gearbox Fwd Face 8 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 F.
Procedure

 S 644-011-N00
 (1)  
Lubricate the packings (1, 3) with engine oil.

 S 434-006-N00

 (2)  
Install the packings (1, 3) in the grooves of the pressure relief valve (2).

 S 644-012-N00

 (3)  
Lubricate the threads of the pressure relief valve (2) with engine oil.

 S 424-013-N00

 (4)  
Install the pressure relief valve (2) in the housing of the main oil filter.

 (a)  
Tighten the pressure relief valve (2) to 525-625 pound-inches (59.3-70.6 N.m.).

 (b)  
Install the lockwire or safety cable and safety cable ferrule to the pressure relief valve (2).

 S 414-008-N00
 (5)  
Close the left thrust reverser half (Ref 78-31-00/201).

 (6)
Do the servicing procedure for the oil tank (Ref 12-13-03/301).

 (7)
Do the Test No. 3 - Ground Test - Idle Power (Ref 71-00-00/501).

 S 614-009-N00
 S 794-010-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-21-06
 ALL  ú ú N01 Page 404 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
OIL SYSTEM PRESSURE (REGULATOR) RELIEF VALVE - REMOVAL/INSTALLATION
___________________________________________________________________
 1.  General
_______
 A.  This procedure removes and installs the pressure (regulator) relief valve for the oil system.
 B.  The pressure (regulator) relief valve is installed in a housing which is attached with bolts to the forward side of the housing for the main oil filter. The housing is installed on the forward face of the main gearbox at the 8 o'clock position. The removal of the housing for the pressure (regulator) relief valve is not necessary.
 C.  You can get access to the pressure (regulator) relief valve through the left thrust reverser half.
 TASK 79-21-07-004-001-N00
 2.  Remove the Oil System Pressure (Regulator) Relief Valve (Fig. 401)
_______________________________________________________
　
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