S 394-043

 (4)  
Apply Alodine protective coating to the cleaned surfaces of the rear spar.

 S 424-018

 (5)  
Put the heat exchanger through the access panel in the wing.

 NOTE: Put the end of the heat exchanger with the inlet and outlet
____
 ports in first.

 S 424-020
 (6)  
Put the heat exchanger in its position with the inlet and outlet fittings in the holes in the rear spar.

 S 434-016

 (7)  
Install new O-rings on the hydraulic fittings for the heat exchanger.

 NOTE:____Make sure the O-rings are correctly installed. Apply assembly lube or hydraulic fluid to the O- rings and the hydraulic fittings. This will make the installation easier.
 S 434-021
 (8)  
Install one phenolic washer (BACW10P361LA, 0.020 inch thick) at each mounting point of the heat exchanger.

 (9)  
Install the mounting bolts but do not tighten them.

 S 434-022
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737-300/400/500MAINTENANCE MANUAL
 S 434-023
 (10) At the rear spar, install bulkhead nuts and washers.
 (a) Tighten the bulkhead nuts and install lockwire.
 S 214-024
 (11) Measure the clearance at each mounting point, between the phenolic washer and the heat exchanger. If the clearance is more than 0.010 inch, do these steps:
 (a)
Remove the phenolic washer.

 (b)
Measure the clearance with no washers in it.

 (c)
Install the number of washers shown in the table that follows.

 --------------------------------------------------------------------------------| CLEARANCE WITH NO WASHERS - INCHES | TOTAL NUMBER OF WASHERS NECESSARY | -------------------------------------------------------------------------------| | 0.093 - 0.074 | 1 - BACW10P361LA | | | 1 - BACW10P168L | --------------------------------------------------------------------------------| 0.073 - 0.052 | 1 - BACW10P168L | --------------------------------------------------------------------------------| 0.051 - 0.031 | 2 - BACW10P361LA | --------------------------------------------------------------------------------
S 434-025
 (12)
 When you get the correct clearance at all of the mounting points, tighten the mounting bolts.

 S 914-027

 (13)
 Clean the bonding jumper and its mating surfaces (AMM 20-10-34/701).

 (14)
 Connect the bonding jumper to the airplane.

 S 764-046

 (15)
 Make sure the resistance of the bonding jumper is less than 5 milliohms (SWPM 20-20-00).

 S 914-029

 (16)
 Make sure the resistance between the rear spar and the hydraulic fitting is less than 1 milliohms (SWPM 20-20-00).

 S 434-028
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A
737-300/400/500MAINTENANCE MANUAL
 S 394-026
 (17)
 Apply a fillet seal of BMS 5-26 on the hydraulic fittings at the rear spar (AMM 51-31-00/201). Apply the seal on the inner side of the fuel tank.

 S 944-030

 (18)
 Make sure you remove all of the tools, unwanted parts, and unwanted objects from the wing fuel tank.

 S 414-031

 (19)
 Install the No. 1 access panel for the wing fuel tank (AMM 28-11-11/401).

 S 434-032

 (20)
 Connect the hydraulic lines to the fittings for the heat exchanger at the rear spar.

 S 654-033

 (21)
 Fill the fuel tank to a minimum of 250 gallons (1675 lbs/760 kg) (AMM 12-11-00/301).

 S 794-034

 (22)
 Make sure the No. 1 access panel, and the bulkhead fittings for the heat exchanger (at the rear spar) do not have leaks of fuel.

 S 864-035

 (23)
 Pressurize the applicable hydraulic reservoir (AMM 29-09-00/201).
　
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