FUEL IN
FUEL OUT
FUEL BYPASS VALVE
MAIN OIL/FUEL HEAT EXCHANGER B-B
S-M56-MM-0948 (1)-00-B Oil Distribution System Figure 2 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
8.  Operation (Fig. 3)
_________
 A.  The four positive displacement pumps are on a single shaft driven by the AGB. The supply pump incorporates a pressure relief valve that diverts the oil flow to a scavenge pump in the event of abnormal operating conditions. The pressure relief valve opens when the pressure downstream of the supply pump exceeds 305 psi (2100 kPa).
 B.  During normal operating conditions, the oil flows through the oil supply filter prior to distribution and the scavenge oil filter on return. When either filter becomes clogged, the flow will divert through the respective bypass valve. The bypass valves start to open when the pressure drop reaches 17.4-20.3 psi (120-140 kPa) across the oil supply filter and 36.3-39.2 psi (250-270 kPa) across the scavenge oil filter.
 C.  The clogging indicators pop up before a filter bypass condition. When the pressure drop across the scavenge filter reaches 28-34 psi (193-234.4 kPa) (20.9-28.3 psi (144-195 kPa) on some engines), or 11.6-14.5 psi (80-100 kPa) across the supply filter, the magnets are forced apart - the indicator pops up, becoming visible in the glass inspection bowl. A bimetal spring prevents actuation at low operating temperatures.
 D.  Before returning to the engine oil tank, the oil is cooled in the main oil/fuel heat exchanger. Fuel enters the cylindrical core through the fuel inlet in the housing. It flows the length of the core through half the core tubes. The fuel flows around a baffle in the core access cover and returns through the remaining core tubes. Oil passes through the servo fuel heater and enters the main oil/fuel heat exchanger perpendicular to the fuel flow. The oil circulates around the fuel tubes in the core, transfering heat to the fuel by convection and conduction. The cooled oil exists back through the servo fuel heater.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
BEARINGNO. 1, 2, 3 BEARINGNO. 4, 5
VENT ENGINE CENTER SHAFTFORWARD
AFT GEARBOX
SUMP SUMP
OIL/FUEL
VENT
HEAT EXCHANGER
TRANSFER
GEARBOX

PRESSURE
RELIEF VALVE

BYPASS
BYPASS
VALVE AND

CHECK CHECK
VALVE AND
CLOGGING

VALVE VALVE
CLOGGING
GEARBOX

INDICATOR
INDICATOR
SCAVENGE
OIL
OILFILTER
SUPPLY
SUPPLY FILTER
OIL
SUPPLY SCAVENGE
DRIVE

PUMP PUMPS
SHAFT

PRESSURE
RELIEF
VALVE

ACCESSORY LUBRICATION UNIT MAGNETIC CHIPGEARBOX DETECTORS
LEGEND
VENT
OIL SUPPLY
OIL TANK

SCAVENGE OIL
Oil Distribution System Schematic
Figure 3

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T88624
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LUBRICATION UNIT - REMOVAL/INSTALLATION
_______________________________________
 1.  General
_______
 A.  The lubrication unit is found on the AGB (accessory gearbox) at the 6 o'clock position. You must open the two fan cowl panels to get access to the AGB.
　
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