3-9. General Repair Procedures (cont).
If flush head rivet is being installed, countersink hole using a 100-degree machine countersink.
Coat all rivets with sealer before installing.
Insert rivet in hole. Make sure sheets are held tightly together before upsetting or pulling rivet.
Select proper pulling head for rivet being installed and install pulling head on rivet gun.
Insert stem of rivet into pulling head.
With pulling head parallel to axis of rivet, upset rivet. Exert firm pressure but do not bend or buckle
metal sheets. Stem will break off below rivet head surface. No trimming should be required.
Make sure riveted parts are not loose, rivet does not rotate and rivet head is seated tightly against
riveted surface. If rivet is loose or improperly installed, remove it and install a new one.
(2) Removal. (figure 3-5)
Drilling creates metal chips which may enter eyes and cause serious injury. Eye
protection is required.
When drilling through rivet head, be careful to avoid enlarging hole in structure. Keep drill
perpendicular to material being drilled and do not exert excessive pressure on drill, Or
replacement rivets will be too lose.
Drill through head of rivet only, using hole in rivet as a guide. Use proper drill size as follows:
Rivet size (in.)
Using a pin punch, pry off rivet head.
Using pin punch, push out remainder of rivet shank. If shank will not easily push out, drill it out.