CBEJ Page 3 Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CHAPTER 79 - OIL
TABLE OF CONTENTS
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Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
Adjustment/Test 501 ALL System Test 501 SWITCH - OIL FILTER DIFFERENTIAL 79-35-01 PRESSURE Removal/Installation 401 ALL
79-CONTENTS
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL - DESCRIPTION AND OPERATION
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1. General
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A. The engine oil system is a self-contained, centervented and recirculating type system. Each engine has an independant oil system to provide lubrication and cooling for the engine main bearings, radial driveshaft bearings and gears and bearings in the transfer gearbox (TGB) and accessory gearbox (AGB).
B. The oil system is comprised of oil storage, AMM 79-11-00; distribution, AMM 79-21-00; and indicating systems.
C. Indicating systems provide measurements of oil quantity, AMM 79-31-00, oil pressure, AMM 79-32-00, and oil temperature, AMM 79-34-00. Warning lights also provide a low oil pressure warning, AMM 79-33-00, and oil filter bypass warning, AMM 79-35-00. The condition of the engine oil system and the performance of associated engine components are determined by visual indication of these systems in the flight compartment.
2. Operation (Fig. 1 and 2)
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A. The oil tank provides storage of oil for continuous distribution by the supply system. Oil flows from the tank to the supply pump in the lubrication unit on the AGB. The oil is pressurized and is pumped through the oil supply filter to the main bearings, radial driveshaft and gearboxes.
B. After distribution, oil is returned to the lubrication unit from three sumps. The forward sump services the No. 1, No. 2 and No. 3 main bearings. The aft sump services the No. 4 and No. 5 main bearings. The gearbox sump for the AGB also collects oil through an external tube from the TGB.
C. The lubrication unit contains a scavenge pump for each sump. The oil is drawn through one of three magnetic chip detectors (MCD) in the lubrication unit and is pumped through the scavenge oil filter to the main oil/fuel heat exchanger. Cooled oil is returned to the oil tank.
D. A drain is provided at the forward and aft bearing compartment for possible oil leaking past the stationary air/oil seal. The forward seal drain exits through the 8 o'clock fan frame strut. The aft seal drain exits through the 6 o'clock turbine frame strut.
E. The bearing sumps and gearboxes are interconnected to collect oil vapors before air/oil separation and venting. The oil tank vent and the TGB/AGB sump are connected to the forward sump. Vapors from the forward and aft sumps pass through rotating air/oil separators into the mainshaft center vent tube to be vented out the exhaust. The separated oil is returned to the sumps.
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79-00-00
ALL ú ú C01 Page 1 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Oil Supply System Schematic
Figure 1
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79-00-00
ALL ú ú C01 Page 2 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OF THE LUBRICATION UNIT.
Oil Scavenge and Vent System Schematic Figure 2
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79-00-00
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