(b)  
Disconnect the drain tube nut from the bypass valve.

 (c)  
Remove the bypass valve drain tube (LP20) (37) of the fuel/oil cooler from the engine.

 (d)  
Discard the packings (39), (40) and the retainer (38).

 S 034-010-N00
 (14)
 Disconnect the oil trim pressure tube (LP32) (36) as follows:

 (a)  
ENGINES PRE-PW-SB 72-211; Remove the bolts (46) and nuts (47) that attach the oil trim pressure tube (LP32) to the bracket behind the fuel/oil cooler.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
ENGINES POST-PW-SB 72-211;
 Remove the bolts (46) and nuts (47) that attach the oil trim
 pressure tube (LP32) to the No. 3 bearing pressure manifold.

 (c)  
Remove the bolts (43) that attach the oil trim pressure tube
 (LP32) to the top inboard port "TRIM" on the main oil filter
 housing (1).

 (d)  
Remove the oil trim pressure tube assembly (LP32) (36) from the main oil filter houseing (1).

 (e)  
Discard the packing (42).

 S 024-011-N00
 (15)
 Remove the main oil filter housing (1) from the main gearbox as follows:

 (a)  
Remove the bolts (60) and washers (61) that attach the main oil filter housing (1) to the forward face of the main gearbox. and remove housing (1) from engine. 1) Remove the main oil filter housing (1) from the engine.

 (b)  
Remove the transfer tubes and, if applicable, the anti-siphon tube assembly as follows: 1) ENGINES PRE-PW-SB 79-43;

 Remove the three transfer tubes (54, 55A, and 55B) from the transfer tube ports in the main gearbox.
 2)  ENGINES POST-PW-SB 79-43; Remove the transfer tubes (54 and 55A) and the anti-siphon tube assembly (55C) from the transfer tube ports in the main gearbox.
 3)  Discard the packings (45 and 53).
 S 034-038-N00
 (16)
 ENGINES PRE-PW-SB 72-524; If you will install a new main oil filter housing (1), do the steps that follow (Fig. 402, View L):

 (a)  
Remove the lockwire and pressure relief valve (66) for the oil filter from the main oil filter housing (1). 1) Discard the packings (64 and 65).

 (b)  
Remove the reducers (49), inserts (51), and packings (50
 and 52) from the LP4 and LP5 ports on the top forward and
 inboard face of the main oil filter housing (1).
 1) Discard the packings (50 and 52).

 (c)  
Remove the plug (59) and insert (67) from the bottom port in
 the main oil strainer cover.
 1) Discard the packings (58 and 68).

 WARNING:_______CAREFULLY REMOVE THE MAIN OIL FILTER COVER. THE MAIN OIL FILTER COVER HAS SPRING PRESSURE ON IT. INJURY TO PERSONS CAN OCCUR WHEN YOU REMOVE IT.

 (d)  
Remove the bolts (60) and washers (61) that attach the main oil filter cover (29) to the main oil filter housing (1). 1) Remove the cover (29). 2) Discard the packing (57).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(e)  
Remove the filter element (56) from the main oil filter
 housing (1).
 1) Discard the filter element (56).

 (f)  
Remove the screw (70), spring (69), and keywasher (71) from the cover (29). 1) Remove and discard the keywasher (71).

 (g)  
Remove the oil system pressure relief valve (21). 1) Remove the bolts (60) that attach the bracket and pressure relief valve (21) to the main oil filter housing (1). 2) Remove the bracket (30), and the pressure relief valve

 (21).
 3) Discard the packings (62 and 63).

 S 034-044-N00
 (17)
 ENGINES POST-PW-SB 72-524 AND PRE-PW-SB 79-79; If you will install a new main oil filter housing (1), do the steps that follow (Fig. 402, View M):
　
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