S 494-004-N00
 (2)  
Put the container below the differential pressure switch.

 S 034-035-N00

 (3)  
ENGINES WITHOUT PW SB 79-77;
 Do the steps that follow:

 WARNING: BEFORE YOU OPEN THE OIL TANK CAP, PERMIT A MINIMUM OF FIVE
_______ MINUTES AFTER THE 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.
 WARNING:_______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.
 (a)  
Disconnect the tube nuts for the inlet pressure tube and outlet pressure tube from the differential pressure switch.

 (b)  
Remove the bolts, washers, and nuts which attach the
 differential pressure switch to the bracket.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-35-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(c)  
Remove the differential pressure switch.

 (d)  
Install the protection caps.

 S 034-036-N00
 (4)  ENGINES WITH PW SB 79-77;
 Do the steps that follow:

 (a)  
Remove the bolt and clamp that attach the oil filter pressure tube to the mount bracket.

 (b)  
Disengage and remove the two oil filter pressure tubes (LP45, LP46) and elbow from the oil filter housing outlet and inlet ports.

 (c)  
Remove the three bolts that attach the differential pressure switch to the mount bracket.

 (d)  
Remove the differential pressure switch.

 (e)  
Install protective plugs in the oil filter housing outlet and inlet ports as necessary.

 TASK 79-35-01-404-009-N00
 3. Install the Oil Filter Differential Pressure Switch (Fig. 401)
___________________________________________________
 A. Equipment
 (1)  
M303, M305, or M307 Bergen Mechanical Crimper
 Bergen Cable Technologies Inc
 170 Gregg St

 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.
References

 (1)  
AMM 71-00-00/501, Power Plant

 (2)  
AMM 71-11-04/201, Fan Cowl Panels

 (3)  
AMM 71-11-06/201, Core Cowl Panels

 (4)  
AMM 78-31-00/201, Thrust Reverser System

 (5)  
IPC 79-35-01 Fig. 1

 (6)  
WDM 79-35-11

 (7)  
SSM 79-35-01

 D.
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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-35-01
 ALL  ú ú N01 Page 405 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(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

 E.  
Procedure

 S 424-037-N00
 (1)  
ENGINES WITHOUT PW SB 79-77;
 Do the steps that follow:

 (a)  
Install the differential pressure switch on the bracket with the bolts, washers and nuts. 1) Lubricate the threads of the bolts, which attach the

 differential pressure switch, with engine oil.
 2)  ENGINES WITHOUT PW SB 79-70; Tighten the bolts to 32-38 pound-inches (3.616-4.294 newton-meters).
　
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