M16 Maintenance Manual TM9-1005-319-23.pdf - CombatRifle.net

ARMY TM 9-1005-319-23&P
AIR FORCE TO 11W3-5-5-42
3. Inspect bolt for cracks In the locking lugs and the bolt cam pin hole area. Use black light If available;
otherwise, use a glass of no more than 3X magnification or use a penetrant kit (item 25, app D). Pay close
attention to the area where the locking lugs meet the body. Replace bolt assembly if bolt is defective.
WARNING
Dry cleaning solvent is flammable and toxic and should be used in a well-ventilated area. The use of
rubber gloves is necessary to protect the skin when washing rifle parts.
4. Use penetrant kit (Item 25, app D) to check for cracks in bolt as follows:
(a)
(b)
(c)
(d)
(e)
The area to be inspected must be clean,
free of oil, etc. Spray a small amount of
remover on the area to be inspected, let dry
and wipe off with a wiping rag.
Spray penetrant (only enough to wet the
area) on the area of the bolt (1) to be
inspected.
Spray developer over the penetrant and let
the developer work. Cracks will be
indicated by a change in color where there
is a crack. If there are cracks, the
component 1’ unserviceable.
Pay close attention to the area where the
locking lugs (2) meet the body.
If there are no cracks, spray remover on
the area; let dry and wipe off with a wiping
rag. Oil the area to prevent corrosion.
(f) Replace bolt assembly If bolt (1) is
defective.
NOTE
Replacement of the bolt assembly will require that the headspace be tested (p 3-45, TEST).
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