CAUTION: DO NOT REMOVE THE BRACKET FROM THE PRESSURIZING VALVE.
_______
 THIS CAN CAUSE DAMAGE TO THE VALVE.

 (l)  
Disconnect the clamps 3 and 4 from the bracket attached to the pressurizing valve. 1) Do not remove the clamps from the lines.

 (m)  
Disconnect the oil return (OIL-OUT) line from the port on the inboard side of the servo fuel heater.

 (n)  
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 step above.

 a) Keep the clamps on the oil return line. b) Remove the line from the engine.
 S 034-023-C00
 (12) Remove the plumbing lines from the aft side of the MEC as follows (Fig. 405):
 NOTE: The removal of the MEC will be easier if you disconnect and
____ remove the flexible hoses at the two ends. 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.

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
PCR LINE
VBV OPEN LINE
VBV CLOSE LINE
HEAD END LINE SUPPLY LINE OF THE
OF THE VSV CIT SENSOR (P6 PORT) ROD END LINE
RETURN LINE OF THE
OF THE VSV
CIT SENSOR (PB PORT)

EXTENSION RING
TURBINE CLEARANCE TC2 LINE
TURBINE CLEARANCE TC1 LINE
CBP LINE
PS3 LINE (CDP PORT)
ENGINES WITHOUT THE HPTCC TIMER
A
MEC Aft Plumbing Line Installation
Figure 405 (Sheet 1)

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE B
VBV CLOSE
LINE VBV OPEN LINE
P6 LINE PCR LINE
HEAD END LINE
PC LINE OF THE VSV
ROD END LINE OF THE VSV
SUPPLY LINE OF THE CIT SENSOR (P6 PORT) TC3 LINE
TC2 LINE
RETURN LINE OF THE
CIT SENSOR (PB PORT)

TC1 LINE
CLAMP CBP LINE
PS3 LINE (CDP PORT)
ENGINES WITH THE HPTCC TIMER
B
MEC Aft Plumbing Line Installation
Figure 405 (Sheet 2)

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(c)  
Remove the flexible hoses from the VSV ROD and VSV HEAD end.

 (d)  
ENGINES WITH THE HPTCC TIMER;
 Disconnect the PC line from the MEC.

 (e)  
Disconnect the sensor supply (P6) to the compressor inlet
 temperature (CIT) line from the MEC.

 (f)  
Disconnect the return (PB) line of the CIT sensor from the MEC.

 (g)  
Disconnect the clamps that attach the P6 and PB lines to the
 bracket on the MEC.

 (h)  
Disconnect the VBV OPEN line from the MEC.

 (i)  
Remove the flexible hose.

 (j)  
Disconnect the VBV CLOSE line from the MEC.

 (k)  
Remove the flexible hose.

 (l)  
Disconnect the PCR line from the fitting forward of the upper overboard drain.
　
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