(3)  
Disconnect the bonding jumper from the wing.

 (4)
Remove the bolts that attach the heat exchanger to the wing.

 S 034-010
 S 034-011
 S 024-012
 NOTE: Do not discard the phenolic washers.
____
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737-300/400/500MAINTENANCE MANUAL
 S 024-013
 (5)  Loosen the hydraulic fittings for the heat exchanger from the rear spar.
 NOTE: Do not use a tool harder than 2024-T3 aluminum to remove the
____
 sealant.

 S 024-014
 (6) Remove the heat exchanger through the access panel in the wing.
 TASK 29-15-04-404-015
 3. Heat Exchanger Installation (Fig. 401)
___________________________
 A. Consumable Materials
 (1)  
D00054 Skydrol Assembly Lube - MCS 352

 (2)  
D00153 Hydraulic Fluid - BMS 3-11

 (3)  
A00955 Sealant - BMS 5-26

 (4)  
C00862 Alodine 600 - Protective Coating, Alodine

 B. References
 (1)  
AMM 12-11-00/301, Fuel

 (2)  
AMM 12-12-00/301, Hydraulic Reservoir Servicing

 (3)  
AMM 12-40-00/201, Cleaning and Washing

 (4)  
AMM 20-10-34/701, Metal Surfaces

 (5)  
SWPM 20-20-00, Standard Wiring Practices Manual

 (6)  
AMM 28-10-00/201, Storage

 (7)  
AMM 28-11-11/401, Wing Fuel Tank Access Panels

 (8)  
AMM 29-09-00/201, Hydraulic Resesvoir Presurization System

 (9)  
AMM 29-15-00/201, Hydraulic Systems A, B, and Standby

 (10)
 AMM 51-31-00/201, Seals and Sealing

 C. Access
 (1)  
Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 (2)  
Access Panels
 7202L Fuel Tank Access Door (No. 1)
 7402R Fuel Tank Access Door (No. 1)

 D. Procedure
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737-300/400/500
MAINTENANCE MANUAL

BSEE SYSTEM B HEAT EXCHANGER 
MOUNTING BRACKET FOR THE FUEL LINE 
COOLING TUBES 
COOLING FINS BONDING JUMPER  SEE A SYSTEM A HEAT EXCHANGER 
BOLTS (4 LOCATIONS) FUEL TANK BOTTOM  SCREW 
SCREW CLAMP 
SEALANT AROUND THE SYSTEM A HEAT EXCHANGER BULKHEAD FITTING FLANGE  BULKHEAD NUT WASHER O-RING (ON THE TANK SIDE) 
A 
COOLING FINS  COOLING TUBES  MOUNTING BRACKET FOR THE FUEL LINE 
CLAMP SCREW WASHER 

MOUNTING BOLTS (4 LOCATIONS)
BONDING JUMPER FUEL TANK BOTTOM SCREW
SEALANT AROUND THE
BULKHEAD NUT
BULKHEAD FITTING FLANGE
WASHER
O-RING (ON THE TANK SIDE) SYSTEM B HEAT EXCHANGER B
Heat Exchanger Installation
Figure 401

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737-300/400/500MAINTENANCE MANUAL
 S 914-047
 WARNING:_______OBEY ALL OF THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. IF YOU DO NOT, INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE CAN OCCUR.
 (1)  
Prepare the fuel tank before you get in it (AMM 28-10-00/201).

 S 164-045

 (2)  
Remove the finish from the flange of the the heat exchanger fittings (AMM 20-10-34/701).

 S 214-019

 (3)  
Remove the finish from the surface around the heat exchanger holes on both sides of the rear spar (AMM 20-10-34/701).
　
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