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A
737-300/400/500MAINTENANCE MANUAL
 (f) Make a mark on these leak locations with the marking pen.
 NOTE: If you are not sure you found the correct leak path,
____ you can apply the bubble solution to the external leak location and blow air through the internal leaks. If air blows through the external leak location, you found the correct leak path.
 S 366-044
 (9)  If you find a leak in a self-sealing fastener, refer to 28-11-00/801 for procedures to do a temporary repair of self-sealing fasteners with leaks.
 NOTE: Self-sealing fasteners are frequently used in the fuel
____ tank. These fasteners have a plastic collar that prevents fuel flow. They are not covered with sealant. Do not put sealant on these fasteners unless you find one with a leak. The only permanent repair of a self-sealing fastener with a leak is to remove the used fastener and install a new one (Ref Structural Repair Manual).
 I. Repair the Internal Leaks
 S 146-087
 (1)  Use sealant cutting tools (Fig. 605) to remove the bad sealant around the internal leak.
 NOTE: If the leak is in the sealant around a sealed fastener,
____ it is usually necessary to remove all of the used sealant around the fastener and seal it again (Fig 610).
 (a)  
An aluminum tool is usually necessary to cut the sealant away from the tank structure.

 (b)  
You can use a plastic tool to scrape away the remaining sealant.

 (c)  
Make sure you remove all of the loose sealant.

 (d)  
Cut into the good sealant on each side of the leak with a margin of an inch or more.

 (e)  
Cut the sealant at an angle to make sure the new sealant has an overlap with the remaining sealant (Fig. 606).

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 ALL  ú ú 01 Page 609 ú Mar 12/02
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737-300/400/500MAINTENANCE MANUAL
 S 116-046
 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.
 (2)  Clean the surface with solvent, Series 93 (AMM 20-30-93/201)
 NOTE: Clean an area approximately twice as large as the area
____ where you will apply the sealant.
 (a)  
Clean the surface with a gauze pad wet with the solvent and dry the surface immediately with a dry gauze pad.

 (b)  
Examine the gauze pad to see if it is dirty.

 (c)  
Continue to clean the surface and dry it until the dry gauze pad is clean when you examine it.

 S 166-064
 CAUTION: MAKE SURE THE PRIMER IS REMOVED IF IT IS NOT HEAT CURED (BAKED
_______ ON) BMS 10-20. THE SEALANT WILL NOT STAY IN PLACE IF THE PRIMER IS NOT HEAT CURED. THIS CAN CAUSE FUEL LEAKAGE.
 (3)  If the surface has a finish layer (topcoat) on the top of the sealant, remove all of the finish from the sealant repair area.
 NOTE: Usually it is not necessary to remove the finish from
____ metal adjacent to the repair area. Finish (topcoat) applied to the top of the sealant can be removed when you remove the sealant.
 S 366-065
 CAUTION: DO NOT APPLY SEALANT TO SURFACES THAT HAVE A TEMPERATURE LESS
_______ THAN 50 DEGREES FAHRENHEIT OR MORE THAN 120 DEGREES FAHRENHEIT. THE SEALANT WILL NOT BOND CORRECTLY TO THE STRUCTURE.
 (4)  Apply a thin layer (precoat) of BMS 5-26 Type II, Class A sealant with a stiff bristled brush to the area that you prepared (Fig. 607).
 NOTE: Refer to AMM 28-11-00/801 for more data about sealant
____ preparation.
 (a)  Use a circular motion to apply the precoat to the full repair area.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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