28-11-61
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A
737-300/400/500MAINTENANCE MANUAL
 E. Put the Airplane Back to Its Usual Condition
 S 412-011
 (1)
Install the access door for the fuel tank (AMM 28-11-11/401).

 S 652-012

 (2)  
Fill the applicable tank with fuel and do a check for leaks (AMM 12-11-00/301).

 S 652-013

 (3)  
Drain a small quantity of fuel from the tank to make sure the valve operates correctly.

 TASK 28-11-61-602-018
 4. Primary Drain Seal O-Ring Replacement (Sump Drain Valve P/N VD82-2941)
_____________________________________
 A. Access
 (1)  Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 B. Procedure
 S 032-014
 CAUTION: MAKE SURE THE SCREWDRIVER HAS A TIGHT FIT WITH THE VALVE
_______ OUTLET. YOU CAN CAUSE DAMAGE TO THE VALVE OUTLET WITH THE SCREWDRIVER.
 (1)  
With a screwdriver, push the poppet up while you turn it counterclockwise.

 S 032-015

 (2)  
Remove the screwdriver to cause the poppet to fall into the seal replacement position (Fig. 202).

 NOTE: A small quantity of fuel can drain from the tank.
____
 S 962-016
 (3)  Replace the O-ring on the poppet.
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A 737-300/400/500MAINTENANCE MANUAL
JAM NUT
SCREEN

MAIN TANK FUEL SUMP DRAIN VALVE
SEE A
GUIDE PIN IN DRAIN POSITION
GUIDE PIN IN CLOSED POSITION
VALVE FACE SEE B
B1  B1
CLOSED OR DRAIN POSITION A
1
ALTERNATE INSTALLATIONS
Main Tank Fuel Sump Drain Valve Installation
Figure 201

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A
737-300/400/500MAINTENANCE MANUAL
 S 432-017
 (4)  Close the poppet.
 (a)  
With the screwdriver, push the poppet up and turn it clockwise.

 (b)  
Remove the screwdriver.

 (c)  
Make sure the poppet stays in its closed position and that there are no fuel leaks.

 TASK 28-11-61-602-019
 5.  Primary Drain Seal O-ring Replacement (Sump Drain Valve P/N 87-5273)_____________________________________
 A. Access
 (1)  Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 B. Procedure
 (1)  S 032-021Loosen and remove the valve core plug and the valve poppet with a socket wrench.
 (2)  S 032-022Remove and discard the valve core O-ring and primary O-ring on the valve poppet.
 (3)  S 432-023Install a new valve core O-ring and a new valve poppet O-ring.
 (4)  S 432-024Install valve poppet and the valve core. (a) With the socket wrench, tighten the valve poppet to a maximum torque of 50 pound-inches with the socket wrench.
 (5)  S 652-025Drain a small quantity of fuel from the tank to make sure the valve operates correctly and has a good seal.

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 28-11-61
 ALL  ú ú 01 Page 205 ú Jul 15/96
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A 737-300/400/500MAINTENANCE MANUAL

SUMP DRAIN VALVE P/N 87-5273  SUMP DRAIN VALVE P/N VD82-2941

Main Tank Fuel Sump Drain Valve Primary Drain Seal Replacement
Figure 202

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