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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 RETURN
LINE
SERVO FUEL HEATER
OIL-IN LINE
CLAMPS NO. 1 AND 2 
MAIN OIL SCAVENGE FILTER AND SERVO FUEL HEATER OIL-IN LINE BETWEEN  PRESSURIZING VALVE 
MAIN OIL SCAVANGE FILTER  FWD  B  CLAMP NO. 4 CLAMP NO. 3 SEE OIL TANK RETURN LINE HOSE C 
CLAMP NO. 2 
MEC 

CLAMP NO. 1
PLA CONNECTOR
PRESSURIZING VALVE
CLAMP NO. 3
CLAMP NO. 4
FWD C
Fuel Pump Package Outboard Plumbing Line Installation Figure 405 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
CAUTION: DO NOT REMOVE THE BRACKET FROM THE PRESSURIZING
_______ VALVE. THIS CAN CAUSE DAMAGE TO THE VALVE.
 2)  Disconnect the clamps 3 and 4 from the bracket attached to the pressurizing valve. a) Do not remove the clamps from the lines.
 (j)  
Disconnect the oil return (OIL-OUT) line from the port on the inboard side of the servo fuel heater.

 (k)  
Disconnect the oil return (OIL-OUT) line, installed below the MEC, from the oil tank return hose. 1) Disconnect the clamps from the brackets in the above step.

 a) Keep the clamps on the oil return line. b) Remove the line from the engine.
 S 034-019-C00
 (11) ENGINES WITH THE HPTCC TIMER; Do these steps to remove the PB line (Fig. 405, Sheet 1):
 (a)  
Disconnect the PB line from the fuel pump.

 (b)  
Disconnect the clamp that attaches the PB line to the AGB.

 (c)  
Move the line forward.

 S 034-023-C00
 (12) Remove these plumbing lines from the aft side of the MEC as follows (Fig. 406):
 NOTE: The removal of the fuel pump package will be easier if you
____ disconnect and remove the flexible hoses. These flexible hoses will be identified in the steps that follow.
 CAUTION: USE TWO WRENCHES TO REMOVE THE TUBE COUPLING NUTS, ONE TO
_______ HOLD THE FITTING AND ONE TO LOOSEN THE COUPLING NUT. THIS WILL PREVENT DAMAGE TO THE HARDWARE.
 (a)  
Disconnect the VSV HEAD end line at the MEC and the top end of the flexible hose.

 (b)  
Disconnect the VSV ROD end line at the MEC and the top end of the flexible hose.

 (c)  
Remove the flexible hoses to the VSV ROD and the VSV HEAD end.

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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 ////////////////////////
FUEL PUMP ASSEMBLY SEE A
VBV OPEN LINE
VBV CLOSE LINE
CIT SENSOR SUPPLY VSV HEAD END LINE
(P6 PORT) LINE
VSV ROD END LINE CIT SENSOR RETURN (PB PORT) LINE
EXTENSION RING
TURBINE CLEARANCE TC2 LINE
TURBINE CLEARANCE TC1 LINE
CBP LINE
PS3 (CDP PORT) LINE
FUEL PUMP ASSEMBLY
(ENGINES WITHOUT THE HPTCC TIMER)

A

Fuel Pump Package Aft Plumbing Line Installation
Figure 406 (Sheet 1)

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 ALL  ú ú C01 Page 415 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL PUMP ASSEMBLY SEE A
VBV CLOSE LINE
　
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