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 (a)  Apply the solvent through the element with a clean brush.
 (3)  S 166-004-N00Put the solvent which is caught in the container through a paper paint strainer, or the equivalent, to catch the contamination in the solvent.
 (4)  S 226-005-N00If there is contamination, do the inspection for the oil system contamination (Ref 72-00-00/601).
 (5)  S 426-006-N00Install the new element for the main oil filter (Ref 79-21-05/401).

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 79-21-05
 ALL  ú ú N01 Page 603 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
MAIN OIL FILTER PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General
_______
 A.  This procedure removes and installs the pressure relief valve for the main oil filter.
 B.  The pressure relief valve is installed on the forward side of the housing for the main oil filter. The housing is attached to the forward face of the main gearbox at the 8 o'clock position.
 C.  You can get access to the pressure relief valve through the left thrust reverser half.
 NOTE: For engines with PW SB 72-525 (Dual Element Oil Filter),
____ see AMM 79-21-05/401 for removal and installation of the pressure relief valve.
 TASK 79-21-06-004-001-N00
 2.  Remove the Main Oil Filter Pressure Relief Valve (Fig. 401)
________________________________________________
 A.  Standard Tools and Equipment
 (1)
Container - 5 U.S. gallon (20 liter) capacity, used to catch the oil

 B.  
References

 (1)
78-31-00/201, Thrust Reverser System

 (2)
IPC 79-21-06 Fig. 1

 C.  
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

 D.  
Procedure

 (1)
Open the left thrust reverser half (Ref 78-31-00/201).

 S 014-002-N00
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 ALL  ú ú N01 Page 401 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A 
FUEL/OIL COOLER (REF) 
GEARBOX MAIN (REF) 
1. PACKING 3. PACKING  MAIN OIL FILTER HOUSING 
2.  RELIEF VALVE FILTER PRESSURE MAIN OIL 

FWD
A
Main Oil Filter Pressure Relief Valve Installation Figure 401
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 ALL  ú ú N01 Page 402 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 494-003-N00
 WARNING: BEFORE YOU OPEN THE OIL TANK CAP, PERMIT A MINIMUM OF FIVE
_______ MINUTES AFTER ENGINE SHUTDOWN TO LET THE PRESSURE IN THE OIL TANK BLEED OFF. A FAST FLOW OF HOT OIL CAN OCCUR AND CAUSE INJURY TO YOU.
 DO NOT KEEP THE OIL ON YOUR SKIN FOR A LONG TIME. IF YOU DO NOT CLEAN THE OIL OFF, THE OIL CAN CAUSE INJURY.
 (2)  
Put the container below the pressure relief valve (2) to catch the remaining oil.

 S 024-004-N00

 (3)  
Remove the pressure relief valve (2) from the housing of the main oil filter.

 (a)  Discard the packing (1, 3).
 TASK 79-21-06-404-005-N00
 3. Install the Main Oil Filter Pressure Relief Valve (Fig. 401)
_________________________________________________
　
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