REPAIR - CONTINUED - TM-9-2320-303-24-20420

TM 9-2320-303-24-2

HOOD SHEET MOLDED COMPOUND (SMC) REPAIR - CONTINUED

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REPAIR - CONTINUED

WARNING

Solvents can burn easily, can give off harmful vapors, and are harmful to skin and clothing. To avoid injury

or death, keep away from open fire and use in well-ventilated area. If solvent gets on skin or clothing, wash

immediately with soap and water.

Clean area with xylene or equivalent solvent. Inspect area closely.

If sound-absorbent liner is present on underside of damaged area, remove panel(s) to provide adequate working

area.

If repairing crack (2), use 1/8-in diameter bit to drill hole (1) completely through uncracked laminate. Drill hole 1/8-in (3

mm) from each end of crack to prevent crack from lengthening.

WARNING

Wear goggles and air purifying respirator when cutting, grinding or sanding during fiberglass repairs. Ground dust

and particles could cause temporary or permanent damage to eyes, and if inhaled, could cause respiratory irritation.

On engine side of hood (6), use router bit on grinder or drill to grind away shallow recess. Grind recess to one-

quarter depth of laminate (7) and 1/2 in (13 mm) outward from all sides of damage. Taper outside edge of ground

area (5). If repairing crack (2), grind outward to drilled hole (1) at end of crack, but not beyond.

Use 100-220 grit sandpaper to scuff area at least 1 in (25 mm) away from fracture on all sides (3). Scuff thoroughly

to give surface to which patch can stick.

WARNING

Compressed air used for cleaning or drying purposes, or for clearing restrictions, should never exceed 30 psi

(207 kPa). Wear protective clothing (goggles/shield, gloves, etc.) and use caution to avoid injury to person-

nel.

Blow dust away with compressed air and wipe area with clean cloth.

If necessary, align panel sections on both sides of crack (2), using weights or clamps to establish original panel

profile.

Using razor knife, cut section of woven fiberglass cloth (4) to overlay crack (2) about 3/4 in (19 mm).

Using wooden stir stick and measuring in spoonfuls, mix equal volumes of magnolia 58 A and B epoxy resins on

clean sheet of glass, metal or section of scrap laminate. Mix 15 seconds.

Use stir stick to spread thin layer of mixed epoxy resins over scuffed area (3).

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