(f)  
Disconnect the clamps [1] thru [4] from the oil-in line and the return line.

 (g)  
Disconnect the sensing line to the pressure switch for the oil filter bypass, and loosen the 4 bolts on the scavenge filter of the main oil system.

 (h)  
Disconnect the oil return line from the OIL OUT port of the housing for the servo fuel heater. 1) Remove and keep the gasket.

 (i)  
To remove the servo fuel heater, move the oil-in line and the oil return lines rearwards.

 (j)  
Disconnect the fuel discharge line from the FUEL OUT port on the cover for the servo fuel heater. 1) Loosen the discharge line at the connection on the inlet

 port of the MEC servo.

 (k)  
To remove the servo fuel heater, turn the discharge line.

 S 024-011-C00
 (6)  Remove the servo fuel heater from the oil/fuel heat exchanger.
 (a)  Remove and keep the gasket.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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/FUEL HEAT EXCHANGER
SERVO FUEL HEATER
SEE A
GASKET
1
WASHER,
NUT
(6 LOCATIONS)

MEC
2
3
B SERVO FUEL HEATER COVER
4
FUEL DISCHARGE LINE
OIL/FUEL HEAT EXCHANGER OIL RETURN LINE
FUEL SUPPLY LINE
SEE  B  HOUSING SERVO FUEL HEATER 
5 
FUEL PUMP  (OIL IN) LINE TO SERVO FUEL HEATER MAIN OIL SCAVENGE FILTER 
1  PUMP HP HOUSING ENGINES WITH HPTCC TIMER AND WITH PBP ELBOW ON FUEL 
2  AND WITHOUT PBP ELBOW ENGINES WITH HPTCC TIMER 
3  AND WITH PBP ELBOW ENGINES WITHOUT HPTCC TIMER 
4  AND WITH PBP BLANKING PLATE ENGINES WITHOUT HPTCC TIMER  SEE  C 
5  ENGINES WITHOUT HPTCC TIMER AND WITHOUT PBP ELBOW  A 

Servo Fuel Heater Installation
Figure 401 (Sheet 1)

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 ALL  ú ú C01 Page 403 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 [1] [2] 
FUEL HEATER FILTER AND SERVO MAIN OIL SCAVENGE OIL IN LINE BETWEEN  VALVE PRESSURIZING 
FILTER SCAVANGE MAIN OIL  C  SEE CLAMP [4] CLAMP [3]  D 
CLAMP [2] 
MEC 

CLAMP [1] 
VALVE PRESSURIZING  PLA CONNECTOR 
CLAMP [3] 
CLAMP [4]  FWD  D Figure 401 (Sheet 2) Servo Fuel Heater Installation

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 ALL  ú ú C01 Page 404 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(7)  S 614-020-C00Add engine oil to the open oil and fuel ports of the servo fuel heater.
 (8)  S 864-013-C00Install the protective caps and plugs to the open ports of the servo fuel heater. (a) Shake and turn the heater for approximately one minute.
 (9)  S 864-014-C00Install protective caps and plugs on the open lines on the engine.

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