IDG OIL TO
BYPASS PORTIDG FUEL/OIL
COOLER CORE
BLOCKED PORT
FUEL/OIL COOLER BYPASS VALVE
EEC CHANNEL "B" SERVO OIL CONNECTOR RETURN TO OIL TANK
EEC CHANNEL "A"
ENGINE CONNECTOR
OIL IN
OVERBOARD DRAIN FUEL/OIL COOLER BYPASS IDG OIL FROM
VALVE AND SOLENOID
IDG AIR/OIL HEAT EXCHANGER
E
Engine Oil Distribution System Component Location Figure 1 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
OIL TANK
MAIN
FILLER CAP
GEARBOX
1
SEE H
SEE F FWD
SEE G
MASTER MAGNETIC OIL TANK
CHIP DETECTOR
2 F
ANGLE GEARBOX MAGNETIC
NO. 3 BEARING CHIP DETECTOR
MAGNETIC NO. 1,1.5, AND 2 CHIP DETECTOR BEARING MAGNETICNO. 4 BEARING CHIP DETECTORMAGNETIC
CHIP DETECTOR
FWD
MAIN GEARBOX MAIN MAGNETIC CHIP GEARBOX DETECTOR (REF)
G
MAIN GEARBOX (REF)
INTEGRATED DRIVE LUBRICATION AND GENERATOR (REF) SCAVENGE OIL PUMP
FWD 1
ENGINES WITHOUT PWSB 79-65 2 ENGINES WITH PWSB 79-65 H
Engine Oil Distribution System Component Location Figure 1 (Sheet 4)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
INTERMEDIATE CASE (REF)
SEE K
SEE I SEE J NO. 1, 1.5, AND NO. 2 BEARING LAST CHANCE OIL STRAINER
FWD FUEL/OIL COOLER (REF) LAST CHANCE OIL STRAINER ANGLE AND MAIN GEARBOX
I
FUEL/OIL COOLER (REF)
FWD J NO. 3 BEARING LAST CHANCE OIL STRAINER NO. 4 BEARING LAST CHANCE OIL STRAINER
TURBINE EXHAUST CASE (REF)
FWD
K
Engine Oil Distribution System Component Location Figure 1 (Sheet 5)
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C. ENGINES WITH PW SB 72-525;
The dual element oil filter is a filter within a filter design.
D. The dual element design features a 150 micron secondary element within the 65 micron primary element.
E. ENGINES WITHOUT PW SB 72-525;
The bypass valve for the main oil filter is installed on the top forward side of the housing for the main oil filter.
F. ENGINES WITH PW SB 72-525;
The primary filter bypass valve is installed on the bottom centerbody of the filter assembly.
G. If there is a clogged main oil filter, the bypass valve opens and gives free oil flow around the main oil filter. The bypass valve opens when the differential pressure is more than 70 psid, and closes when the pressure is less than 70 psid.
4. Main Oil Filter Pressure Relief Valve (Fig. 1)
_____________________________________
A. The pressure relief valve for the main oil filter is installed on the oil filter housing and senses the pressure differential across the main oil filter. The pressure relief valve supplies continuous oil flow to the main bearings and gearboxes by bypassing the main oil filter if there is a clogged main oil filter.
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