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 by dye penetrant. Defects must be re-welded in
castings as outlined in Specifications QQ-A-601
with
methods.
Measure
above
accordance
and
MIL-W-8604.
Preheat
slowly
in
an
oven
or
by other suitable method for two hours to ap-
casting
and
compare
dimensions
taken
before
proximately 350 degrees 35 degrees F.
repair. Dimensional change will not exceed that
Control preheat process to avoid incipient
as specified on applicable engineering drawing,
melting, excessive grain growth or other un-
except as noted. Check machined surfaces for
desirable structural changes which might reduce
warpage or other dimensional changes. Clean
the mechanical properties.
seams with a wire brush and remove weld beads
Caution:
Do not attempt to preheat by
and all sharp edges. X-ray entire repaired area.
using welding torch.
Remove excess flux with suitable material, rinse
(7) W e l d i n g .
with clean water, dry and alodize. Pressure test
oil passages that have been repaired to 90 psi
(a) C r a c k s . The inert gas shielded arc
welding process shall be used when making
hydrostatic pressure using engine oil (OE).
repairs on aluminum alloy. After casting has
d. Ball and Needle Bearings.
reached
the
prescribed
preheat
temperature,
(1) Replace
all
galled,
pitted,
or
damaged
position the casting into the most advantageous
welding position. Cover casting with asbestos
(2) Replace all bearings which do
not
blankets, except for area to be welded. Weld the
conform to tolerances specified in the
ap-
outside milled groove with a good root weld.
propriate repair and rebuild standards table.
Apply fillet welds until groove is closed. Rotate
(3) Refer to TM 9-214 for information on
casting and weld inside groove in the same
inspection, care, and maintenance of anti-friction
manner if double "V" is used. Remove asbestos
blankets and allow castings to cool progressively
e. Studs. Replace all bent or loose studs or
to room Temperature.
studs showing evidence of stretching. Repair
(b) Fracture and missing metal.
minor damage with a thread chaser. Replace all
Following the procedure outlined in (a), above,
studs having stripped or damaged threads.
place insert piece in opening, aline and secure
Remove and replace studs as outlined in (1) and
with clamps or tack weld in three or four places
(2), below.
with one inch welds. Place a good root weld in
(1) Stud identification. Stud
identification
groove
and
apply
fillet
welds
until
groove
is
tables appear in the overhaul sections of this
closed. Rotate casting and weld inside groove in
chapter.
Each
table
contains
the
appropriate
the same manner.
inform ation regarding stud setting heights,
Note. The temperature of the casting
oversize studs, number required and reference
surrounding the welded area should not exceed
figures
of
stud
identification
and
location.
395 degrees. If necessary, stop welding, cover
(2) Removal.
Using
stud
extractor,
back
casting with asbestos blanket and allow to cool to
studs out slowly
to avoid heating and possible
a satisfactory temperature then resume welding.
seizure. When studs are broken off too short to
(8) Final inspection and clean up. R e p a i r e d
use stud extractor, drill stud and extract with a
cracks and areas where metal has been replaced
suitable remover. Short studs may also be
must be radiographically inspected and be equal
removed by welding a piece of bar stock or a nut
to or better than reference standard 3, TACOM
to stud and removing with a wrench.
STD 113, Apr 69 (available from USTACOM
AMSTA-R). All other areas shall be inspected
6-6
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