S 844-021

 (2)  
If the gasket is damaged, do these steps to replace the gasket:

 (a)  Remove the gasket and all adhesive with a putty knife or similar tool that has a medium sharp edge.
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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Use methyl ethyl ketone, isopropyl alcohol, or ethyl alcohol to remove all of the remaining adhesive.

 (c)  
Do these steps to install a gasket that does not already have adhesive applied: 1) Apply a large quantity of the primer on the surfaces to be

 bonded. 2) Let the primer dry for a minimum of 30-minutes. 3) Apply a constant layer of the adhesive. 4) Attach the surfaces as soon as it is possible after you
 apply the adhesive.
 NOTE: Apply sufficient pressure to make sure the
____ surfaces touch fully. Do not apply pressure that pushes the adhesive out from the surfaces.
 5)  Let the installation dry for 24 hours at 70 to 80°F or 45 to 60 minutes at 200 to 250-F.
 (d)  Do these steps to install a gasket that already has adhesive applied: 1) Remove the tape from the gasket. 2) Install the gasket on the heat exchanger.
 NOTE: Make sure the heat exchanger surface is clean
____ and flat before you install the gasket.
 E.  Install the heat exchanger.
 S 424-022
 (1)  
Put the heat exchanger in its position.

 S 434-027

 (2)  
Hold the heat exchanger while you install the fasteners on the inboard side of the heat exchanger:

 (a)  For the primary heat exchanger, install the bolts and washers that attach the heat exchanger to the two clip assemblies and to the outlet duct for the ram air.
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A 737-300/400/500MAINTENANCE MANUAL
SECONDARY HEAT 
EXCHANGER
SEE  B  THE RAM AIR INLET DUCT FOR 
RAM AIR DUCT ACCESS DOOR  EQUIPMENT BAY DOORS  FOR THE INLET DUCT INSPECTION DOORS OF THE RAM AIR 
PRIMARY HEAT 
EXCHANGER 

FWD  PRIMARY HEAT EXCHANGER SECONDARY HEAT EXCHANGER  HEAT EXCHANGER THE PRIMARY INLET DUCT TO SEE A THE TURBOFAN DRIVE DUCT ASSEMBLY TO DUCT BETWEEN THE PRIMARY HEAT EXCHANGER AND THE MIX VALVE 
AIR CONDITIONING EQUIPMENT BAYS 
THE TURBOFAN DRIVE DUCT ASSEMBLY TO 
RAM AIR DUCT 
STIFFENING FLANGE 
SECONDARY HEAT EXCHANGER 
PRIMARY HEAT EXCHANGER  AIR CLEANER PURGE LINE FOR THE A  FWD 
Heat Exchanger Installation Figure 401 (Sheet 1) 

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A 737-300/400/500MAINTENANCE MANUAL
INLET LIP TO THE HEAT EXCHANGER
SEE C
SUPPORT ROD FOR INLET DUCT FORTHE HEAT EXCHANGER THE RAM AIR
SEE D
OUTLET DUCT FOR 
THE RAM AIR 
FLEXIBLE  HEAT 
DUCT  EXCHANGER 
GASKET 
SECONDARY HEAT  SEE  C 
EXCHANGER 
STIFFENING 
FLANGES 
PRIMARY HEAT 
FWD  EXCHANGER 

B
SUPPORT ROD FOR
LOWER WING BEAMTHE HEAT EXCHANGER GASKET (EXAMPLE, 4 LOCATIONS)INLET LIP TO THE HEAT EXCHANGER CLIP ASSEMBLY FOR THE SUPPORT ROD LOCKNUTS
HEAT
EXCHANGER
INLET
AIR
GASKET
CONDITIONING DUCT
SPACERS
FLEXIBLE DUCT
HEAT
EXCHANGER
FWD FWD STIFFENING FLANGES
　
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