20.
RETAINING RING

13.  MAIN OIL STRAINER
21.  PRESSURECOVER RELIEF VALVE
6. PACKING
9. PACKING
12.  WASHER
10.  PLUG
14.  NUT
ENGINES WITH PW SB 72-525 G
L-B3670 (0000)
Main Oil Filter Installation Figure 401 (Sheet 4)
G26209
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
.
MAIN OIL FILTER HOUSING
SEE H
SEE I
L-B3670 (0000)
H
(0.127-0.254 mm) 0.005-0.010 INCH 
STUD  1 LOCKING RING  STUD  2 LOCKING RING  STUD  LOCKING RING 
CONDITION UNACCEPTABLE  CONDITION UNACCEPTABLE  ACCEPTABLE CONDITION 
I  I  I 
2 1  REMOVE AND REPLACE THE MAIN OIL FILTER HOUSING IF THE LOCK RING IS ABOVE THE HOUSING SURFACE, IF THE STUD SERRATED EDGES ARE ABOVE THE LOCK HOUSING RING, REMOVE AND REPLACE THE MAIN OIL FILTER  L-B7798 (0100) 
Figure 401 (Sheet 5) Main Oil Filter Installation 

L31114
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S 014-018-N00
 (2)  
Open the left fan cowl panel (AMM 71-11-04/201).

 S 014-019-N00

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

 S 014-024-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU 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).

 E.
Remove the Main Oil Filter (Fig. 401)

 S 034-026-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.
 (1)  
Remove the lockwire which attaches the drain plug (10) to the bottom of the insert.

 S 684-027-N00

 (2)  
Put the container below the drain plug (10).

 S 024-073-N00
 WARNING: DO NOT GET THE ENGINE OIL ON YOUR CLOTHES OR ON THE AIRPLANE.
_______ DO NOT KEEP THE ENGINE OIL ON YOUR SKIN FOR A LONG TIME. IF YOU DO NOT CLEAN THE ENGINE OIL OFF, THE ENGINE OIL CAN CAUSE INJURY.
 CAUTION: IF YOU DO NOT CLEAN THE ENGINE OIL OFF, THE ENGINE OIL CAN
_______ CAUSE A STAIN ON YOUR CLOTHES AND THE PAINT WILL BECOME SOFT.
 (3)  ENGINES PRE-PW-SB 72-524;
 do the steps that follow (Fig. 401, View A):

 (a)  
Hold the insert (8) in position with a wrench on the flats to remove the drain plug (10).

 (b)  
Remove the drain plug (10) with the wrench. 1) Discard the packing (9) on the drain plug (10).

 (c)  
Permit the housing of the main oil filter to drain.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
WARNING:_______A TENSION FROM A SPRING IS ON THE FILTER COVER. HOLD THE FILTER COVER WITH YOUR HAND TO MAKE SURE THE FILTER COVER DOES NOT EJECT WHEN YOU REMOVE THE BOLTS.
 (d)  
While you hold the filter cover in position with your hand, remove the bolts (11) and washers (12) which attach the filter cover (13).
　
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