L-A2734
Fuel Injector and Support Fits and Clearances
Figure 601
D04934
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
A
MAIN GEAR BOX
REAR VIEW
541,543 542 541 542
A-A 2
A-A 1
1
ENGINES POST-PW-SB 72-375
2
ENGINES PRE-PW-SB 72-375 L-A2719
EEC Alternator (N2 Transducer) Fits and Clearances
Figure 602
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D04937
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
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A
MAIN GEARBOX REAR VIEW
1850
A-A
L-A2718
Gearbox Alternator Drive Fits and Clearances Figure 603
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OIL - CLEANING/PAINTING
_______________________
1. General
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A. This procedure gives direction on how to clean the engine after chemical contact with oil.
TASK 73-00-00-107-001-N00
2. Clean the Engine Component
__________________________
A. References
(1)
AMM 70-42-05/201, Engine Contamination
B.
Procedure
S 117-002-N00
(1) If necessary, clean the engine to remove oil by SPOP 425 (AMM 70-42-05/201).
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FUEL DISTRIBUTION SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________
1. General
_______
A. The fuel distribution system supplies metered fuel to the fuel injectors in the engine combustion chamber. The fuel distribution system also supplies engine oil and IDG oil cooling.
B. The major components of the fuel distribution system include the fuel pump, fuel bypass valve, fuel distribution valve, and fuel injectors.
2. Fuel Pump (Fig. 1)
_________
A. The fuel pump is installed on the forward face of the main gearbox at the 4 o'clock position. The splined input shaft of the fuel pump engages the main gearbox which moves the centrifugal boost stage and the positive displacement main stage.
B. The fuel pump contains a 40 micron disposable filter, filter bypass valve, and a main stage pressure relief valve. The fuel pump also contains filter bypass warning and intermediate stage pressure, main stage pressure, and temperature indicating.
C. If there is a clogged filter, the filter bypass valve will open when the differential pressure across the filter is 9.0 psid (62.0 kPad). The fuel will then bypass the filter. A differential pressure switch for the fuel pump gives an EICAS status message before filter bypass occurs (AMM 73-31-00).
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