79-35-00
 ALL  ú ú C01 Page 1 ú Jul 15/95
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
MAIN OIL/FUEL HEAT EXCHANGER
SEE A
GEARBOX ACCESSORY 
MEC 
FUEL PUMP  FWD 
SCAVENGE OIL FILTER  SEE  B 
LUBRICATION UNIT 
A 
CONNECTOR ELECTICAL  TUBE PRESSURE INLET  UNIT LUBRICATION 

OUTLET PRESSURE
TUBE

OIL FILTER BRACKET
DIFFERENTIAL  FWD
PRESSURE SWITCH
B
Oil Filter Differential Warning System - Component LocationFigure 1 (Sheet 1)
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 79-35-00
 ALL  ú ú C01 Page 2 ú Mar 15/94
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
OIL FILTER OIL FILTER BYPASS BYPASS WARNING LIGHT WARNING LIGHT
START VALVE START VALVE 
OPEN  A  OPEN  A 
LOW OIL  OIL FILTER  LOW OIL  OIL FILTER 
PRESSURE  A  BYPASS  A  PRESSURE  A  BYPASS  A 

PILOTS CENTER INSTRUMENT PANEL
A

Oil Filter Bypass Warning System Component Location
Figure 1 (Sheet 2)

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 79-35-00
 ALL  ú ú C01 Page 3 ú Mar 15/94
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

BREAKER PANEL
Oil Filter Bypass Warning System Schematic
Figure 2

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 ú  C01  Page 4
 ú  Mar 15/94 

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL FILTER BYPASS WARNING SYSTEM - ADJUSTMENT/TEST
__________________________________________________
 1.  General
_______
 A.  An operational test is not given for the oil filter bypass warning system.
 (1)  If the OIL FILTER BYPASS light comes on, you must replace the oil filter pressure switch.
 B.  A system test is given to make sure the system operates correctly after you replace the oil filter differential pressure switch or bypass warning light.
 C.  It also makes sure the system precision is satisfactory.
 TASK 79-35-00-735-002-C00
 2.  System Test - Oil Filter Bypass Warning System
______________________________________________
 A.  Equipment
 (1)  
Dry air pressure source - adjustable, 0-35 psi
 (0-240 kPa) (incorporating vent valve, shutoff
 valve and gauge with | 2% accuracy).

 (2)  
Test equipment, Engine fuel/oil pressure switch

 -C79001-1 (optional)
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 71-11-02/201, Fan Cowl Panel

 C.  Access
 (1)  
Location Zones
 506 Engine No. 1
 606 Engine No. 2

 (2)  
Access Panels
 5737L/5746L Engine No. 1 - Fan Cowl Assembly
 5837R/5846R Engine No. 2 - Fan Cowl Assembly

 D.  Prepare for the Test (Fig. 501)
 S 015-003-C00
 (1)  Open the left fan cowl panel (AMM 71-11-02/201).
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