TO
35C2-3-442-2
P-8-627-34
TM-07464A-35
TM 5-6115-457-34
f. Thread supporting screw into base of
thoroughly.
fixture to contain turbine wheel and shaft
c. Clean oil passages in housing assem-
bly using a pipe cleaner. This cleaning
when pressed from wheel (48), Leave a
should be done only when the housing assem-
space between end of screw and turbine
bly has been completely disassembled.
wheel. Approximately l/2-inch of shaft
and turbine wheel movement is required to
free them from wheel.
8-73.
INSPECTION .
g. When removing wheel (48), remove
nut (47) and then position compressor end
Refer to table 1-1, and using a suit-
a.
of housing in a hot oil bath so only wheel is
able micrometer and feeler gauge, inspect
immersed. Heat wheel to 350F for not
parts for dimensional tolerances. Replace
longer than 10 minutes. Remove unit from
parts that do not meet dimensional toler-
oil bath and press shaft and turbine wheel
ances.
(60) as a unit from wheel (48).
h. Use the wood dowel to remove thrust
CAUTION
plate assembly from center housing. Refer
to figure 8-180
The following step is a critical area
8-72. CLEANING.
of inspection. Any deformation or
damage to wheels will cause a seri-
ous out-of -balance condition whit h
will damage turbocharger.
Cleaning Solvents are flammable and
moderately toxic to skin, eyes and
respiratory tract. Eye and skin
b. Inspect compressor and turbine
protection required. Good general
wheels (48 and 60, figure 8-16) for cracks,
ventilation is normally adequate.
wear, chips, or any other defect. Check
carefully for any blade distortion. If de-
CAUTION
fective, replace wheel. Do not attempt to
straighten blades.
Rotating components must be
thoroughly cleaned in order to main-
tain critical balance of turbocharger.
c. Inspect bearings for cracks, distor-
Do not use a wire brush or wheel on
tion, or any other defect,
any parts.
a. Clean all metal parts using an ap-
proved cleaning solvent. Dry parts
d. Check runout of shaft. This can be
thoroughly. Use a piece of wood to clean
done by one of two methods, Use standard
carbon and deposits from turbine housing
bearings and place shaft in vee blocks or
(65, figure 8-16). Discard all seals and
use a partially open vise.
packings.
b. The turbine wheel must be cleaned
thoroughly to remove all carbon deposits.
e. Inspect shaft for cracks, roughness,
It may be necessary to soak wheel in solvent
distortion, or any other defect, Check ring
for at least one hour to remove hardened
grooves for wear, Replace defective shaft.
carbon deposits. Scrape off loosened parti-
cles with a stiff brush or a specially shaped
f. Inspect housing for cracks, breaks,
piece of wood, If turbine wheel is covered
with soot only, use cleaning solvent and a
or any other defect. Replace defective
stiff brush, rinse with clean water, and dry
housing,
8-37
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