S 034-004-C00

 (3)
Disconnect the electrical connector from the pressure switch.

 S 034-018-C00
 WARNING:_______DO NOT TOUCH THE OIL SYSTEM PARTS IF THE ENGINE IS HOT. THESE PARTS STAY HOTTER THAN OTHER ENGINE PARTS AFTER AN ENGINE SHUTDOWN. IF YOU TOUCH AN OIL SYSTEM PART WHEN THE ENGINE IS HOT, IT CAN BURN YOU.
 (4)  Disconnect the oil tubes from the pressure switch.
 (a) Disconnect the inlet tube from the pressure switch.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-35-01
 ALL  ú ú C01 Page 401 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
MAIN OIL/FUEL HEAT EXCHANGER
SEE A
ACCESSORY GEARBOX 
MEC 
FUEL PUMP 
FWD 
SCAVENGE OIL FILTER  SEE  B 
LUBRICATION UNIT  A  INLET PRESSURE TUBE WASHER BOLT AND (3 LOCATIONS)  LUBRICATION UNIT 

ELECTRICAL
CONNECTOR

OUTLET PRESSURE TUBE
OIL FILTER DIFFERENTIAL FWDPRESSURE SWITCH
BRACKET B
Oil Filter Differential Pressure Switch Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-35-01
 ALL  ú ú C01 Page 402 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b)  
Let any oil in the tube drain into the container.

 (c)  
Discard the O-ring.

 (d)  
Disconnect the outlet tube from the pressure switch.

 (e)  
Let any oil in the tube drain into the container.

 (f)  
Discard the O-ring.

 S 024-006-C00
 (5)  Remove the pressure switch.
 (a)  
Remove the bolts and washers (3 locations) that attach the pressure switch to the mounting bracket.

 (b)  
Remove the pressure switch.

 S 034-015-C00
 (6)  Install protective caps in the ends of the disconnected tubes.
 TASK 79-35-01-404-007-C00
 3.  Oil Filter Differential Pressure Switch Installation____________________________________________________
 A. Consumable Materials
 (1)  DOO599, 0il, (CP2442) engine - CFMI SB 79-001
 B. References
 (1)  
AMM 12-13-11/301, Engine Oil

 (2)  
AMM 71-00-00/501, Power Plant

 (3)  
AMM 71-11-02/201, Fan Cowl Panels

 (4)  
AMM 79-35-00/501, Oil Filter Bypass Warning System

 C. Access
 (1)  
Location Zone
 502 LH Fan Cowl, Left Nacelle
 602 LH Fan Cowl, Right Nacelle

 (2)  
Access Panels
 5746L Left Fan Cowl Panel, Left Nacelle
 5846R Left Fan Cowl Panel, Right Nacelle

 D. Procedure (Fig. 401)
 S 434-014-C00
 (1)  
Remove the protective caps from the oil tubes that attach to the pressure switch.

 S 424-008-C00

 (2)  
Install the pressure switch:

 (a)  
Install the bolts and washers (3 locations) that attach the pressure switch to the mounting bracket on the lubrication unit.

 (b)  
Tighten the bolts.

 S 434-009-C00
 (3)  Connect the oil tubes to the pressure switch:
 (a)  
Lubricate two new O-rings with oil.

 (b)  
Install an O-ring on the inlet and the outlet of the pressure switch.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-35-01
 ALL  ú ú C01 Page 403 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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