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 ( 1 ) Inspect all gears for cracks using
engines are precision built and the repair and
rebuild standards found in paragraphs 291
magnaflux equipment. When magnaflux
through 298 for the component parts have been
equipment is not available, use a mag-
fixed at extremely close tolerances. The follow-
nifying glass and a strong light.
ing should apply to all inspection procedures.
Use modern inspection equipment for inspecting
(2) Inspect all gear teeth for wear, sharp
fins, burs, and galled or pitted surfaces.
component parts having extremely close toler-
ances where cracks and other damage cannot
be spotted visually. Extreme care must be ex-
(3) Check all gears for conformance to the
ercised in all phases of inspection. Inspect com-
applicable repair and rebuild standards
ponents as follows:
in paragraphs 291 through 298.
b . Castings.
f. Bushings and Bushing-type Bearings.
(1) Inspect all ferrous (cast iron, steel,
(1) Check all bushings and bushing-type
etc) castings for cracks with magna-
bearings for secure fit in their respec-
flux equipment. Inspect all non-ferrous
tive casting or mating part and for
(aluminum) castings for cracks using a
evidence of heating which may be in-
magnifying glass and a strong light.
dicated by discoloration of the bushing
Check particularly, the areas adjacent to
or bearing surface.
studs, pipe plugs, threaded inserts, and
in sharp corners and fillets.
(2) Inspect bushings and bushing-type bear-
ings for wear, burs, nicks, or out-of-
(2) Inspect machined surfaces of castings
round condition.
for nicks, burs, or raised metal. Mark
damaged areas for repair.
(3) Check for dirt in lubrication holes or
grooves of bushings or bushing-type
bearings. Holes and grooves must be
(3) Check all mating flanges on housings
clean and free from damage to insure
and supports for warpage with a straight
proper lubrication.
edge or on a surface plate. Inspect
mating flanges for discoloration which
(4) Check all bushings and bushing-type
may indicate persistent oil leakage.
bearings for conformance to the ap-
plicable repair and rebuild standards
(4) Inspect all pipe plug and cap screw
in paragraphs 291 through 298.
tapped openings for damaged or stripped
threads.
g . Helical Coil Inserts.
(5) Check all castings for conformance to
the applicable repair and rebuild stan-
dards in paragraphs 291 through 298.
(1) Description. To permit higher stresses
on studs and bolts which are set in
c. Ball Bearings. Refer to TM 9-214 for in-
aluminum castings, it is common prac-
spection of ball bearings. Check all bearings
tice to install inserts of a stronger
for conformance to the applicable repair and
metal into which the studs or bolts are
rebuild standards in paragraphs 291 through 298.
threaded. Helical coil inserts are de-
signed to perform this function. The in-
d . Studs. Inspect all studs for stripped or
serts are steel spiral coils with a bar
damaged threads, bent or loose condition, and
or tang at the bottom end which is en-
for evidence of stretching.
gaged by an inserting tool used for
threading the insert into the casting.
e. Gears.
Some inserts have a serrated tooth sec-
tion at the top end of the coil to stake
Note. There are no established wear limits
them in place in the castings. Other
on gear teeth. Good judgement is required to
inserts have several turns near the
determine need for replacement.
center of the coil in the form of a
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