79.  
PRESSURRE RELIEF VALVE

57. PACKING
29. COVER
58. PACKING (4 LOCATIONS)
61.  WASHER
81.  NUT 59. PLUG
(4 LOCATIONS)
1
ENGINES PRE-PW-SB 79-43
D
2
ENGINES POST-PW-SB 79-43
L-B3608 (0000)
Main Oil Filter Housing Assembly
Figure 403 (Sheet 5)

G27876
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES POST-PW-SB 72-525 ú

 72-61-11
 ú ú N01 Page 416 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 044-027-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).

 S 014-028-N00

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

 S 014-029-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 thrust reversers (AMM 78-31-00/201).

 S 014-003-N00

 (5)  
Remove the oil filter differential pressure switch (AMM 79-35-01/401).

 S 014-004-N00

 (6)  
Remove the five pneumatic tubes (15, 16, 17, 18, and 19), the drain tube (13), and the fire extinguishing tube assembly (7) as follows:

 (a)  
Disconnect the four pneumatic tube nuts and the fire
 extinguishing tube nut (Fig. 401, View A).

 NOTE: These tube nuts are near the top of the oil tank at
____
 approximately the 10 o'clock position.

 (b)  Remove the three screws (8), washers (9), and nuts (10) that
 attach the five pneumatic tube clamps to the bracket
 (Fig. 401, View C).

 NOTE: This bracket is on the top of the oil tank at
____
 approximately the 9 o'clock position.

 (c)  
Remove the four screws (8), washers (9), and nuts (10) that
 hold the pneumatic tube clamps which are near the top of the
 oil tank (Fig. 401, View D).

 (d)  
Remove the screw (5), washer (6), and nut (4) that attaches the fire extinguishing tube clamp to the bracket.

 NOTE: This bracket is on the top of oil tank at approximately
____
 the 9 o'clock position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-61-11
 ALL  ú ú N01 Page 417 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(e)  
Disconnect the tube nut for the pneumatic tube assembly (18) from the boss on the diffuser case at approximately the 7 o'clock position.

 (f)  
Remove the screw (8), washer (9), and nut (10) that attaches the pneumatic tube clamp to the bracket on the right side of the oil tank mounting flange.

 (g)  
Remove the screw (5), washer (6), and nut (4).

 NOTE: These hold the fire extinguishing tube clamp and the
____ clamp for the fuel/oil cooler drain tube at the top of the main gearbox.
 (h)  Remove the drain tube (13) for the fuel/oil cooler as follows:
 1)  Remove the screw (5), washer (6), and nut (4) that attaches the drain tube clamp to the bracket (12) at the top of the main gearbox.
 2)  Disconnect the tube nuts from the drain port elbow for the fuel/oil cooler and from the tee.
 NOTE: This tee is near the top of the main oil filter
____
 housing (1).

 3) Remove the drain tube (13).
 4) Put covers on all of the openings.

 (i)  Remove the screw (5), washer (6), and nut (4) that attaches the fire extinguishing tube clamp to the bracket (30).
 NOTE: This bracket (30) is at the forward right side of the
____ pressure relief valve (12) for the oil system (Fig. 401, View G).
　
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