(2)
a task to install the sump drain valve for the surge tank.

 B.  The sump drain valves for the surge tank are installed in shrink-fit bushings. These bushings are installed in the skin on the bottom of each wing (Fig. 401). The mating threads of the valve and the bushing have a layer of dry film lubricant, which was baked on at the factory. If you must remove or install the valve, you must be careful not to cause damage to the threads.
 TASK 28-11-21-004-001
 2.  Surge Tank Fuel Sump Drain Valve Removal (Fig. 401)
________________________________________
 A.  Equipment
 (1)
B28001-1 - Surge tank sump drain valve removal tool (preferred)

 (2)
SE28-1103 - Surge tank sump drain valve removal tool (alternate)

 B.  Access
 (1)  Location Zones
 304 Left Fuel Vent Surge Tank
 404 Right Fuel Vent Surge Tank

 C.  Procedure
 S 494-002
 (1) Put the drain valve tool into the valve assembly.
 NOTE: Make sure the hexagonal surfaces of the tool touch the
____
 valve body correctly.

 S 024-003
 (2) Remove the valve body from the valve boss.
 (a)
Push the tool up to prevent fuel leakage during this procedure.

 (b)
Loosen and remove the valve body from the valve boss.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-21
 ALL  ú ú 02 Page 401 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SURGE TANK FUEL SUMP DRAIN VALVE
SEE A
SURGE TANK FUEL SUMP DRAIN VALVE
SEE A
FLAPPER VALVE  FUEL SUMP DRAIN VALVE (TYPICAL) SURGE TANK 
SCREEN  SPRING 
SHRINK-FIT BUSHING  HINGE PIN 
WING SKIN  VALVE TOOL DRAIN 
WING LOWER SKIN  POPPET VALVE SPECIAL TOOL SEE B  5/8 SOCKET (REF)  USE T-HANDLE FOR REMOVAL AND TORQUE WRENCH FOR INSTALLATION 
A 
B 
Figure 401 Surge Tank Fuel Sump Drain Valve Installation 

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 ALL  ú ú 01 Page 402 ú Jun 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c)  Discard the O-ring seal.
 TASK 28-11-21-404-011
 3.  Surge Tank Fuel Sump Drain Valve Installation (Fig. 401)_____________________________________________
 A. Equipment
 (1)  
B28001-1 - Surge tank sump drain valve removal tool (preferred)

 (2)  
SE28-1103 - Surge tank sump drain valve removal tool (alternate)

 B. Consumable Materials
 (1)  B00316 - Aliphatic Naphtha TT-N-95
 C. Access
 (1)  Location Zones
 304 Left Fuel Vent Surge Tank
 404 Right Fuel Vent Surge Tank

 D. Procedure
 (1)  S 164-004Clean the drain valve in the solvent until the screen and the drain valve are free of all unwanted material.
 (2)  S 214-005Make sure the drain valve threads have the layer of dry film lubricant. (a) Replace the valve if the layer of dry film lubricant is not complete.
 (3)  S 644-006Lightly lubricate the new O-ring seal with some fuel.
 (4)  S 434-007Put the O-ring in the correct position on the drain valve.
 S 424-008

 CAUTION: MAKE SURE YOU PUT THE THREADS OF THE VALVE AND THREADS OF
_______ THE BUSHING TOGETHER CORRECTLY. DAMAGE TO THE THREADS CAN OCCUR.
 (5)  Carefully install the valve in the bushing and tighten it with your hand.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-21
 ALL  ú ú 01 Page 403 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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