TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 298 of 779
c.
Castings .
(1) Inspect all ferrous (cast iron, steel, etc.)
castings for cracks with magnetic-particle in -
spectio n
equipment. Inspect all nonferrou s
(aluminu m
castings )
for cracks usin g
flourescent-penetran t
inspection
equipment .
Suspected cracks in the nonferrous casting can
also be inspected with a spot check dye penetrate
or a magnifying glass (five power magnification
minimum) and a strong light or a dye chec k
method. Check particularly the areas adjacent to
studs, pipe plugs, or threaded inserts and i n
sharp corners and fillets .
(2) Inspect machined surfaces of casting s
for nicks, burs, or raised metal. Mark damaged
areas for repair .
(3) Check all mating flanges and mounting
pads with a straight edge or surface plate fo r
warpage. Inspect mating flanges and mountin g
pads for discoloration which may indicat e
persistent oil leakage .
(4) Inspect all tapped openings for stripped
or damaged threads .
(5) Check all castings for conformance to
the applicable repair and rebuild standards .
d. Ball and Needle Bearings.
Refer to TM 9 -
214 for inspectio n
of anti friction bearings .
Check all bearings for conformance to the ap -
plicable overhaul standards .
e. Studs.
Inspect all studs for damaged o r
stripped threads, bent or loose condition, or fo r
any signs of stretching .
f. Dowel Pins .
Inspect dowel pins fo r
looseness or damage. Mark loose pins for repair.
g.
Gears and Shafts .
Note.
There are no established wear limits for
gear teeth and splines. Good judgment i s
required to determine need for replacement .
(1) Inspect all gears and shafts for crack s
using magnaflux equipment. When magnaflu x
equipment is not available, use a magnifyin g
glass (five power magnification minimum) and a
strong light .
(2) Inspect all gear teeth and splines fo r
wear, sharp fins, burs, and galled or pitte d
surfaces .
(3) Inspect shaft and gear hub splines fo r
damage, wear, and for fit with splines on mating
parts. Mating splines must match withou t
binding or looseness .
(4) Check all gears and shafts for con -
formance to the applicable overhaul standards .
h .
Bushings, Liners ,
and Bushing-typ e
Bearings .
(1) Check all bushings, liners, and bushing-
type bearings for secure fit in their respective
casting or mating part, and for evidence o f
heating, which may be indicated by discoloration
of bushing or bearing surface .
(2) Inspect for wear, burs, nicks or out-of -
round condition .
(3) Check for dirt in lubrication holes o r
grooves. Holes and grooves must be clean an d
free from damage to insure proper lubrication .
(4) Inspect thrust faces of bushing-typ e
bearings for wear and by temporarily assembling
mating parts and checking end play with a feeler
gage inserted between the thrust faces .
(5) Check for conformance to the applicable
overhaul standards .
i. Oil Seals.
All oil seals must be replaced a t
engine overhaul. Generally, metal encased oi l
seals are long-life parts and do not have to be
replaced during field repair if inspection in -
dicates seals are in good condition .
(1) Inspect for damage to the thin feathe r
edge of oil seal which contacts rotating part .
(2) Inspect sealing feather edge for softness
and pliability .
(3) Replace damaged or questionable seal s
during field engine repair .
j. Helical-coil and Screw Thread Inserts .
(1)
Description.
To permit higher stresse s
on studs and bolts which are set in aluminu m
castings, it is common practice to install insets of
a stronger metal into which the studs or bolts are
threaded. Helical-coil and screw thread insert s
are designed to perform this function. The in -
serts are spiral steel coils having a right hand
thread-shaped form on the inside and on th e
outside of the coils. A bar or tang at the bottom
end of the coil, which is engaged by an inserting
tool, is used for threading the insert into th e
casting.
Some
inserts
have
a
serrated
tooth
section at the top end of the coil to stake them in
place in the castings. Other inserts have turns at
the center of the coil in the form of a hexagon.
This provides a locking effect when the stud o r
bolt is threaded into the insert .
(2)
Inspection.
Inspect all helical-coil and
screw thread inserts for secure fit in the casting
and for galled or stripped threads .
k .
Painted Parts .
Straighten parts a s
6-4
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