T M 9 - 4 9 3 1 - 3 8 1 - 1 4 & P - 2
k. Cleaning Threaded Holes.
WARNING
Use solvent in a well-ventiIated area away from open flame.
Solvent can burn easily and may give off harmful vapors.
Threaded holes in metal must be thoroughly clean when sealing compounds are used to lock
screws in place. Take off old sealing compound from threads with tap and tap wrench. Blow
loose particles out of holes with compressed air, then clean threads with solvent cleaning
compound (Item 30, appendix C) and acid swabbing brush (Item 8, appendix C). Let holes dry
before putting in screws.
l. Replacing Nutplates (plain self-locking nuts).
WARNING
Primers can burn easily and can give off harmful vapors. To
avoid injury, keep away from open flame and use in a well-
ventiIated
area.
NOTE
Two soldiers are required to replace nutplates.
Using drill and 1/16-inch bit, drill out old rivets. Clean area thoroughly and blow loose particles
out of holes with compressed air. After cleaning, alI parts should be completely dry and free of
corrosion products, scale, paint, grease, oil, flux, and other foreign materials. Coat back of
nutplate and rivets with unthinned primer (Item 23, appendix C). While primer is wet, line up
new nutplate with holes in bracket and insert rivets. Soldier B hold drift pin against rivet on
back of nutplate, Soldier A make fast nutplate by hammering top of rivet with ball peen
hammer. After nutplate has been made fast, repair any damaged areas of the protective finish
with primer. When primer has dried thoroughly, coat any exposed surfaces with chemical film
(Item 12, appendix C).
m. Replacing Inserts.
Primers can burn easiIy and give off harmful vapors. To
avoid injury, keep away from open flame and use in a well-
ventilated area.
WARNING
Take out insert with insert extractor and get rid of insert.
Clean area thoroughly and blow
loose particles out of holes with compressed air. After cleaning, all parts should be completely
dry and free of corrosion products, scale, paint, grease, oil, flux, and other foreign materials.
Coat outside of new insert with unthinned primer (Item 23, appendix C). While primer is wet,
screw insert in housing with inserter. Unscrew and take out inserter. If insert is in a blind hole,
break off tang from insert with tang break-off tool and get rid of tang. When primer has dried
thoroughly, coat any exposed surfaces with chemical film
(Item 12, appendix C).
n. Replacing Rivets MS16535-2,-3,-4.
NOTE
Two soldiers are required to replace rivets.
Take out rivet using drive pin punch and hammer. Clean area thoroughly and blow loose
particles out of holes with compressed air. After cleaning, all parts should be completely dry
and free of corrosion products, scale, paint, grease, oil, flux, and other foreign materials.
Soldier B align and insert rivet and hold drift pin against back of rivet. Soldier A make fast
rivet with center punch and hammer.
2-4
Volume IV
Para. 2-4
