TM 9-2350-261-34R E P A I RW A R N I N GFuel fumes can explode andbum you. Before welding:Drain all fuel. Disconnectand cap all fuel and ventlines. Purge fuel residueandfumesb ysteamcleaning. Purge air from fuel tank withC02.N O T ERepair entire weld joint all around thefuel compartment.5.6.Drill and tap eight 3/8 x 16 UNC-2A (10mm) deep holes on centerline of weld jointcrack about 5–1/2 inches (14 cm ) apart,regardless of crack length.Install eight 3/8 x 16 UNC2A (10 mm)screws in tapped holes. Tighten screws to144-180 in-lb (16-20 N.m) torque. Usetorque wrench. Secure with lockwire.C A U T I O NDo not apply sealing compound intemperatures under 45°F (7°C). Com-pound will not set at low temperature.7.8.9.10.11.Apply one layer of sealing compound1/8-1/4 inch (3-6 mm) thick. Extend sealabout 1 inch (3 cm) on both sides of weldjoint centerline and over screw threads.While sealing compound is still tacky, lay anew rubber seal over centerline of inside andoutside of fuel compartment weld joints.Allow first layer of sealing compound to setfor at least 4layer.Apply second1/8-1/2 inch1/4–1/2 inchfirst layer ofAllow secondset 40 hoursused and 48hours before applying secondlayer of sealing compound(3-13 mm) thick. Extend seal(6-13 mm) behind edges ofsealing compound.layer of sealing compound toat 72°F (22°C) if class B2 ishours if class B4 is used.N O T ETo speed sealant settingelectrical gun type heater.200°F (93°C).time, use anDo not exceed4-4
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