(n)  
Lubricate the packings (50) and the reducer threads (49) with engine oil.

 (o)  
Install the packings (50) on the reducers (49).

 (p)  
Install the reducers (49) in the inserts on the LP4 and LP5
 ports.
 1) Tighten the reducers (49) to 110-120 pound-inches

 (12.4-13.6 newton-meters).

 (q)  
Install the pressure relief valve (66) of the oil filter to the main oil filter housing (1), as follows: 1) Install the packings (64 and 65), lubricated with engine

 oil, in the groove in the pressure relief valve (66) of the oil filter. 2) Install the pressure relief valve (66) of the oil filter to the main oil filter housing (1). 3) Tighten the the pressure relief valve (66) of the oil filter to 525-625 pound-inches (59.3-70.6 newton-meters). 4) Install lockwire or safety cable and safety cable ferrule on the pressure relief valve (66) of the oil filter.

 (r)  
Install the oil system pressure relief valve (21) of the oil system to the port on the main oil filter housing as follows:

 NOTE: This port is below the pressure relief valve of the oil
____
 filter (66).

 1)  Install the packings (62 and 63), lubricated with engine oil, in the groove in the pressure relief valve (21) of the oil system.
 2)  Align the boltholes of the pressure relief valve (21) of the oil system and of the bracket (30) with those of the main oil filter housing (1). a) Install the bolts (60). b) Tighten the bolts (60) to 125-140 pound-inches
 (14.1-15.8 newton-meters). c) Install the lockwire or safety cable and safety cable ferrule.
 S 034-041-N00
 (2)  
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):

 (a)  
Install the spring on the key washer.

 1)  Align the bolt hole and position the keywasher (71) in the center of the cover (29) with the tab of the keywasher in the mating hole in the cover.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
2) Install the keywasher (71) with the screw (70) lubricated with engine oil. 3) Tighten the screw (70) to 36-40 pound-inches (4.1-4.5 newton-meters). 4) Install the spring on the key washer by bending the tabs of the washer out between the coils of the spring.
 CAUTION: MAKE SURE THAT THE REMOVABLE PLUG IS IN THE END CAP OF THE
_______ FILTER ELEMENT. IF THE PLUG IS NOT THERE, THE ELEMENT WILL NOT OPERATE.
 (b)  
Install the filter element (56), with the plugged end outward, into the main oil filter housing (1).

 (c)  
Install the packing (57), lubricated with engine oil, in the groove in the cover (29).

 CAUTION:_______MAKE SURE YOU INSTALL THE COVER CORRECTLY. AN INCORRECTLY INSTALLED COVER CAN CAUSE DAMAGE TO THE PACKING AND AN IN-FLIGHT SHUTDOWN.
 CAUTION: DO NOT USE THE NUTS TO MOVE THE COVER INTO THE MAIN OIL
_______ FILTER HOUSING. IF YOU DO THAT, DAMAGE TO THE PACKING CAN OCCUR.
 (d)  Put the cover (29) on the main oil filter housing (1), with the drain opening in the cover away from the engine.
 CAUTION:_______MAKE SURE YOU TIGHTEN THE NUTS TO THE CORRECT TORQUE. AN INCORRECTLY INSTALLED COVER CAN CAUSE DAMAGE TO THE PACKING AND AN IN-FLIGHT SHUTDOWN.
 (e) Install the nuts (81 or 72) and washers (61) to attach the cover (29). 1) Lubricate the threads with engine oil. 2) If self-locking nuts (81) are used, tighten the nuts to 150-170 pound-inches (16.9-19.2 newton-meters).
 3)  If hex nuts (72) with lockwire provisions are used, tighten the nuts to 125-150 pound-inches (14.1-16.9 newton-meters) and install lockwire.
 (f)  
Lubricate the packing (68) and the threads of the insert (67) with engine oil.

 (g)  
Install the insert (67) and the packing (68) in the cover (29).

 1)  Tighten the insert to 200-225 pound-inches (22.6-25.4
 newton-meters).

 (h)  
Lubricate the packing (58) and the threads of the plug (59) with engine oil.

 (i)  
Install the plug (59) and the packing (58) in the insert (67).

 1)  While you hold the insert with a wrench on the flats,
　
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