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 482 of 779
(4) Preclean core interior to remove oil and
loose sludge fro m
the core to reduce con -
tamination of cleaning solution in subsequen t
operations. Connect pump equipment so tha t
fluid flow will be in the reverse direction o f
normal flow. Use mineral spirits, Federa l
Specification TT-T-291, or kerosene, Federa l
Specification VV-K-211, or dry cleaning solvent ,
Federal Specification P-S-661. Flush core i n
reverse direction for 30 minutes or until solution
appears clean .
Reverse lines and flush ap -
proximately 15 minutes in the opposite direction.
Drain cooler .
(5) Remove carbon deposits, engine oil ,
gums, lead deposits, and foreign contamination
by flushing cooler in opposite direction to normal
oil flow for 30-60 minutes. Use solvent cleaning
compounds conforming to Specification MIL-C -
6864. Reverse lines and flush in opposit e
direction for 15 minutes .
(6) Remove plug installed in bypass ((3) ,
above) openin g
and block coolin g
section
opening. Flush for 15 minutes to clean bypas s
passage .
Remove plug from cooling sectio n
opening and replace in bypass opening .
(7) Rinse cooler for 10 minutes by cir -
culating clear petroleum solvent such as dry -
cleaning solvent, Federal Specification P-S-661 ,
or kerosene, Federal Specification VV-K-211 .
System shall be suitably filtered to preven t
circulation of foreign matter .
(8) Flush cooler with a preservative oi l
consisting
of
three
parts
MIL-L-6082,
Grade
1065, and one part MIL-C-6529, or, for system s
employing
MIL-L-7808
oil,
preservative
oil
MIL-C-8188B, or equivalent, in preparation fo r
shipment or storage .
Connect cooler to pum p
equipment and flush in each direction for 1 0
minutes, checking the mesh screen after eac h
flush to insure that no metal particles hav e
appeared. After flushing operations, install plug s
in inlet and outlet ports .
(9) When the coolers have been cleaned i t
will be necessar y
to recoat them with zin c
chromate
primer
per
MIL-P-8585.
In
order
to
insure that the coating covers the entire core, the
oil ports should be plugged and the cooler dipped
in the zinc chromate. The dip solution should be
prepared as follows: 1 part MIL-P-8585 to 1 ½
parts JAN-T-171 .
(10) It is important that the dip tank b e
covered ,
continuousl y
stirred ,
and frequen t
checks on the viscosity be made as the JAN-T -
171 is so volatile that the concentration ma y
change rapidly. After the cooler is dipped in the
primer it should immediately be blown out with
compressed air from both sides to insure agains t
plugging. The nozzle used to blow air through
the core should be a narrow slit 3 to 4 inche s
long. It is recommended that line air pressure at
about 100 psi be used .
(11) The tanks may be sprayed with prime r
after the dip for appearance, if desired. Fo r
spray, the proportions should be: 1 part MIL-P -
8585 to 1 part TT-6-916B .
d. Inspection.
Refer to paragraph 6-3 and (1 )
through (4), below .
(1)
Oil cooler assemblies.
Inspect oil coole r
assemblies for dented tubing or bent fins. Inspect
gasket contact surfaces for burs and raise d
metal. Seal all oil cooler openings. Pressur e
check coolers by pumping engine oil (OE) into
coolers at 400 psi hydrostatic pressure. Cooler s
must hold 400 psi for ten minutes without loss of
pressure. Release pressure, drain oil, and flush
with dry-cleaning solvent or mineral spirits pain t
thinner .
Identify leaking coolers for possibl e
repair .
(2)
Thermostatic bypass valves.
Inspec t
engine and transmission oil cooler thermostatic
bypass valves for stripped or damaged threads .
Check operatio n
of valve assemblies by im -
mersing valve in war m
water .
Check tem -
perature of water with accurate thermometer .
Gradually raise temperature of water to tem -
peratur e
indicated o n
valv e
cover. Valve s
marked 148 F must travel ¼-inch betwee n
80
F
and
185 F .
Remov e
valve fro m
water and clean with dry-cleaning solvent o r
mineral spirits paint thinner. Replace valv e
assembly when travel is less than ¼-inch .
(3)
Oil cooler hoses.
Inspect oil cooler outlet
and inlet hoses for breaks and abrasions i n
woven shielding .
Replace hose when wove n
shielding is broken or abraided .
(4)
Oil cooler screens.
Inspect oil coole r
screens for bent, cracked, or broken mountin g
brackets. Check for torn or broken screening .
6-188
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