(b)  
B00096 - Dowclene EC, Dow Chemical Company

 (c)  
B00300 - 1,1,1-Trichloroethane

 (d)  
B00634 - Solvent, Citra Safe, Inland Technology, Inc.

 C. References
 (1)  
AMM 20-10-17/401, O-Rings

 (2)  
AMM 28-11-11/801, Integral Fuel Tanks

 D. Repair of O-rings
 S 378-316
 (1)  
If the rubber seal on a tank access door has a leak, replace the tank access door or do this task: Replacement of the Molded Rubber Door Seal (AMM 28-11-11/801).

 S 378-317

 (2)  
If an O-ring on a fuel system component has a leak, do these steps to replace the O-ring:

 (a)  
Get the correct replacement O-ring.

 (b)  
Make sure the cure date of the replacement O-ring is less than 48 months ago.

 (c)  
Remove the used O-ring from the component.

 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (d)  
Clean the O-ring groove and the flat surfaces that the O-ring is between with MEK, acetone, isopropyl alcohol, or ethyl alcohol.

 (e)  
Rub the surfaces dry with the clean gauze.

 (f)  
Examine the O-ring groove and the adjacent fuel surface for cuts, scratches, dents, distortions, and unwanted material.

 (g)  
Repair or replace all components that have leaks.

 (h)  
Examine the new O-ring to make sure it is in a good condition.

 (i)  
Discard the O-ring if it is not in a good condition.

 (j)  
Make a mark of the cure date on the component that you install the O-ring on.

 (k)  
Make sure the O-ring has a good fit in the groove (Fig. 818).

 (l)  
Install the O-ring (AMM 20-10-17/401).

 (m)  
Assemble the component.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
WOOD MUST HAVE A GOOD FIT IN THE GROOVE
O-RING IS TOO LARGE

0-RING CROSS SECTION IS TOO LARGE
CELL FITTING

O-RING CROSS SECTION IS TOO SMALL
O-Ring Groove Preparation and Fit
Figure 818

USE A CLEAN CLOTH AROUND THE WOOD TO CLEAN THE GROOVE

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Secondary Fuel Barrier Sealant Repair
Figure 819

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 368-348
 (3)  If there is leakage in the secondary fuel barrier, the leakage must be repaired before the airplane is released for flight.
 TASK 28-11-00-308-337
 11. Approved Repair of the Secondary Fuel Barrier Sealant (Fig. 819)________________________________________________________________
 A. General
 (1)  
If there is leakage in the secondary fuel barrier, the leakage must be repaired before the airplane is released for flight.

 (2)  
Secondary fuel barrier sealant is a polyurethane (Type II) material applied to the upper exterior surface of the center fuel tank.
　
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