TB-9-2300-403-45
CONTINENTAL MODELS AV-1790 AND AO-895 AND GMC MODELS 6V53/6V53T AND 8V71T SERIES ENGINES: REPAIR OF ALUMINUM OIL COOLERS
TECHNICAL BULLETIN
MARCH 1971
TB-9-2300-403-45 - Page 2 of 5
provide clearance to insert new tubes.
mately 900° F or until flux melt. Apply flux and
(7) Insert new tubes and weld, in accordance
continue heating locally until brazing temperature
with
d
above, using aluminum alloy 6061, 1100, or
(1080° F) is reached. Apply filler at brazing temper-
3003.
ature.
NOTE
Tube size, material, and configuration must
be equal to original.
(2)
Apply brazing alloy.
(3) Immediately after brazing, quench work in
water heated to a minimum of 180° F. Additional
washing in hot water and acid is necessary to re-
g.
ess:
Repair of leak in tube, using torch brazing proc-
move corrosive flux.
5. Test.
a.
Using air, nitrogen, or inert gas, test cool-
(1) Using torch, preheat work area to approxi-
er for leaks under water at 400 psi.
Figure 1. Tube replacement details.
b.
Dry thoroughly with compressed air.
will submit DA Form 2028 (Recommended Changes
6. Surface conditioning.
Apply chemical treat-
to Publications) direct to the Commanding Gen-
ment (Alodine).
eral, U.S. Army Tank-Automotive Command, ATTN:
7. Reporting Of Equipumnt Publication Improve-
AMSTA-MAP, Warren, Mich. 48090. Contrac-
ments.
The reporting of errors, omissions, and recom-
tor will submit a “Report of Shortcoming” to the
mendations for improving this publication by the
Contractor Officer or his designated representa-
individual user is encouraged. Depots/Arsenals
tive.
2
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