cutting tool (Fig. 802). 2) Use a pliers to pull the sealant from the fastener.
NOTE: It is not necessary to remove small quantities
____ of the sealant that bond to the fastener.
S 148-245
(2) If the leak is related to a bad injection seal, do these steps:
(a) Remove the bad sealant from short injection channels with a wire with a hook and small cutting tools.
NOTE: You must disassemble long injection channels
____ (SRM 51-00-00). You can repair bad injection seals if you lift the seal plane to isolate the bad seal from the fuel. Refer to the procedure, "Lift the Seal Plane".
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(b) Make sure the injection channel is fully clear.
NOTE: If there is caught air in the injection channel, the
____ new sealant cannot fully fill the channel.
(c) Be careful not to cause damage to the tank structure.
S 148-329
(3) If the leak is related to a bad prepack or mating surface seal, do these steps:
(a) Disassemble the structure around the bad sealant (SRM 51-00-00). 1) It is not necessary to disassemble the structure to repair
the leak if you lift the seal plane to isolate the bad sealant from the fuel.
NOTE: The area of the sealant with the leak must be
____ small. Refer to the procedure, "Lift the Seal Plane".
(b) Cut the sealant with the leak away from the surface with cutting tools and scrapers.
I. Remove the Precoat
Fillet Seal Removal
Figure 803
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S 118-246
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.
(1) Remove all of the used sealant precoat from the repair area unless you know that the precoat is BMS 5-26, Type II material in a good condition.
(a)
Remove the used precoat with a plastic scraper and (if it is necessary) an abrasive pad.
(b)
Clean the surface with a clean brush and gauze pads wet with solvent, Series 93 (AMM 20-30-93/201).
NOTE: The area you clean must make an overlap with the
____ adjacent area. The total area must be a minimum of two times larger than the area you apply the sealant.
(c)
Rub the area with a clean, dry gauze pad.
(d)
Continue to clean and dry the surface until the dry gauze pad stays clean.
J. Repair the Corrosion (If It is Necessary)
S 378-248
(1) If you find some corrosion on the surface of the tank, do this task: "Repair of Fuel Tank Corrosion".
K. Apply the Fuel Tank Sealant
S 978-249
(1) Refer to Figure 803 to find the application time for the applicable sealant.
NOTE: The time in which you can apply the mixed BMS 5-26, Class
____ B-2 sealant is 2 hours at 77°F (25°C) and 50% relative humidity. The time in which you can apply the mixed Pro-Seal 860, B 1/6 is 10 minutes at 77°F (25°C) and 50% relative humidity.
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