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TM 9-4120-367-14
TM 07592B-14/1
6.3 REPAIR. - Continued
Location/Item
Brazing
Insulation and Gaskets
Hardware
Debrazing
Shims
Repairing Damaged
Threads
Action
a.
b.
c.
a.
b.
a.
b.
c.
a.
b.
a.
b.
a.
b.
c.
Braze copper to copper joints with silver
solder, Grade Ill, IV or VI specifications,
QQ-B-654, and copper to brass or copper
to steel with Grade IV or VI specifications,
QQ-B-654, per MIL-B-7883.
Solder melting point is 1160°F (626°C).
All brazed or soldered joints shall be
made with an atmosphere of nitrogen to
prevent internal oxidation.
Replace damaged insulation and gaskets.
Cement loose insulation.
Replace any damaged screws, washers,
Iockwashers or nuts.
Use screws of correct length to hold parts
securely.
In some applications, screws that are too
long may bottom before the head is tight
against the part it is to hold or may cause
damage to the threads or other parts.
With dry nitrogen flowing through the sys-
tem, debraze tubing connections at any
fitting near the compressor that will permit
convenient removal.
Tubing and fittings attached to the com-
pressor, after their removal, can be trans-
ferred to the replacement compressor be-
fore installation in the air conditioner.
Be sure to remove all shims where used.
Keep shims together and identify them as
to location.
Damaged threads should be repaired by
use of a thread restorer or by chasing in a
lathe.
Internal threads should be repaired with a
tap of the correct size.
If threads cannot be satisfactorily re-
paired, replace the part.
Remarks
6-12
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