TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 2 Download
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TM 9-2320-387-24-2 1 33-7. RIVET REPLACEMENT NOTE When removing rivets, care should be taken to not enlarge rivet hole as this would require use of an oversize or larger rivet for replacement. a. Solid Rivet RemovaL 1. File a flat surface on the manufactured head if accessible. It is always preferableto work on manufactured head rather than the one that is bucked over, since the former will always be more symmetrical about the shank 2. Indent center of the filed surfacewith a center punch 3. .Drillthrough rivet head Be sure to use a drill slightlysmallerthan diameterof rivet shank to avoid making rivet hole oversized. 4. Shear weakened rivet head off with a sharp chisel.For this operation,supportback side of rivet and cut rivet head along direction of rivet line or panel edge. This will prevent distortion of the panel. 5. Firmly supportthe panel from the oppositeside and drive out shank with a pin punch. If rivet is unduly tight because of swellingbetween sheets,drill rivet shank out with an undersize drill bit. b. Blind Rivet Removal. 1. File a small flat space on rivet head. 2. Center punch the flat space. Support rivet backside, if possible. 3. Using a smalldrill bit about the size of rivet pin, drill off tapered end of pin which forms the lock. 4. Shear lock using a pin punch to drive out pin. 5. Fry out remainderof locking collar. 6. Using a drillbit slightly smallerthan rivet shank, drill almostthrough rivet head 7. F’ryoff rivet head with a pin punch_ 8. Tap out rivet shank with a pin punch c. Lockbolt RemovaL 1. Work from the head side of lockbolt, if accessible. File a small tlat space on the head if rounded. 2. Center punch the head 3. Using a hardened drill bit slightlysmallerthan lockbolt,drill through the head In cases where lockbolts are too hard to be drilledwith availabledrills,grind the head down using a cutoff wheel or carbide bit in a die grinder. When using grinder method, cut the head down until it is very thin, but do not grind it completelyoff or touch the body part with grinding tool. 4. Use a pin punch to pry off head or shear it off with a sharp chisel. Make sure the part is adequately supported while performing this step. 5. Drive lockboltout of its hole with a pin punch Care must be taken so that hole or part is not distorted. NOTE In cases where lockbolt head is inaccessible, the locking collar must be removed. It is best to remove collars by grinding or by splitting them axially with a sharp chisel. 33-7