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 CAUTION: USE TWO WRENCHES WHEN YOU REMOVE THE COUPLING NUTS FOR THE
_______ SUPPLY LINE, ONE TO HOLD THE FITTING AND ONE TO LOOSEN THE COUPLING NUT. THIS WILL PREVENT DAMAGE TO THE HARDWARE.
 (11) Remove these plumbing lines from the outboard side of the MEC as follows (Fig. 404):
 (a)  
Disconnect the fuel outlet line at the MEC DISCHARGE port.

 (b)  
Remove the clamp block for the drain line installed below the MEC.

 (c)  
Loosen the clamp blocks downstream of the MEC.

 (d)  
Disconnect the drain line for the main oil/fuel heat exchanger.

 1)  Move the drain line forward and attach it to the accessory gearbox (AGB).

 (e)  
Disconnect the lower overboard drain line from the 45° elbow fitting below the fuel control box. 1) Move the drain line down and forward and attach it to the

 line removed above.

 (f)  
Disconnect the drain line for the starter case.

 1)  Move the drain line down and attach it to the lines you removed above.

 (g)  
Disconnect the floating clamps from the upper overboard drain line and the OIL-IN line. 1) Do not remove the clamps.

 (h)  
Disconnect the upper overboard drain line from the 90° elbow fitting on the top of the MEC and behind the servo fuel heater. 1) Move the drain line down and forward and attach it to the

 line removed above.

 (i)  
Remove the FUEL IN line that goes from the fuel pump to the servo fuel heater.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
PUSH-PULL CABLES
SUPPORT TUBE FOR THE ELECTRICAL CABLE
HORIZONTAL
DRIVE SHAFT

FUEL
OUTLET

ELECTRICAL LINE
CABLE
OIL RETURN LINE
DRAIN LINE FOR THE
MAIN OIL/FUEL HEAT
EXCHANGER

OIL-IN LINE
DRAIN LINE FOR
AA
THE STARTER CASE FLOATING CLAMPS
UPPER OVERBOARD
DRAIN
SEE B SCAVENGE FILTER FOR
THE MAIN OIL SYSTEM
CLAMP BLOCK FOR
UPPER OVERBOARD

THE DRAIN LINE
OIL-IN
DRAIN

LINE  PRESSURIZING LOWER OVERBOARD VALVE
DRAIN LINE
FUEL FILTER
DRAIN PLUG
AND O-RING
A
CORRECT CLAMP INSTALLATION A-A MEC Outboard Plumbing Line Installation Figure 404 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL RETURN
LINE
SERVO FUEL
HEATER
OIL-IN LINE
CLAMPS NO. 1 AND 2OIL-IN LINE BETWEEN THE SCAVENGE FILTER FOR THE MAIN OIL AND THE SERVO FUEL HEATER PRESSURIZING VALVE
SEE  C 
CLAMP NO. 3 
SCAVANGE FILTER FOR  CLAMP NO. 4 
THE MAIN OIL 
RETURN LINE HOSE OF 
THE OIL TANK 
FWD B

CLAMP NO. 2
MEC
CLAMP NO. 1
PLA CONNECTOR
PRESSURIZING VALVE
CLAMP NO. 3
CLAMP NO. 4
C
FWD
MEC Outboard Plumbing Line Installation Figure 404 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(j)  
Remove the OIL-IN line that goes from the main oil scavenge filter to the servo fuel heater (outboard side) (Fig. 404, Sheet 2).

 (k)  
Disconnect the clamps 1 and 2 from the bracket behind the MEC.
　
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