TM 5-6115-400-35
(10) Install gasket, fan spacer, and fan.
(6) Remove the retaining nut from the
spindle.
Press the spindle from the
bearings.
38. Turbocharger
b. Cleaning and Inspection.
Wash all parts
a. General.
thoroughly in clean solvent or fuel and examine the
(1) The turbocharger consists of a radial
parts for wear or damage. Rotate bearings by hand and
inward flow turbine, center housing, and
check for looseness, roughness, or binding; replace
compressor. The turbine is located at the
bearings if necessary. Inspect fan pulley for wear; make
front of the center housing assembly and
certain that grooves are smooth and that the hub is not
the compressor at the rear end. A shaft
chipped or cracked. Discard sealing washer and gasket
integral with the turbine wheel drives the
and install new ones when assembling.
compressor wheel. The shaft is supported
c. Reassembly and Installation.
in the bearing housing by sleeve type
bearings. The rotating assembly consists
(1) Press rear ball bearing onto spindle.
of those parts which rotate while the
(2) Place spacing sleeve in position, then
turbocharger is in operation.
The
front ball bearing onto spindle.
assembly consists of the turbine impeller
(3) Install flex-lok bearing retaining nut and
and shaft, thrust ring, thrust spacer,
tighten securely.
compressor
impeller,
and
impeller
(4) Place pulley in a press, fan end of pulley
retaining nut. The compressor impeller
down, and press spindle and bearing
and turbine impeller are individually
assembly into pulley.
balanced and may be serviced separately.
Note.
(2) Filtered engine oil is supplied under
While pressing spindle into pulley,
pressure through an external line. Oil is
pack area between bearings with
directed through passages from the center
clean ball and roller bearing
housing oil inlet to impeller shaft bearings,
lubricant. Use lubricant conforming
thrust ring, thrust bearing, and thrust
to specification MIL-G-23827.
plate. Oil returns by gravity to the oil pan
(5) Place a new gasket, bearing retaining
through an external line extending from
washer, and a new sealing washer in
the bottom of the center housing to the
position on the spindle. Turn sealing
side of the cylinder block. Oil is sealed
washer retainer into the pulley until hole in
from the compressor and turbine by seal
the retainer is aligned with hole in the
arrangements at both ends of the center
pulley, then install retainer snap ring.
housing.
(6) Place washer in position on spindle.
b. Two Thousand Hour Inspection and Service. A
major inspection of the turbocharger should be made
(7) Insert spindle into bore of fan mounting
after each 2,000 hour period of operation.
This
bracket.
inspection requires removal of the turbocharger from the
(8) Start the adjusting screw, with lockwasher
engine, and removal of the compressor and turbine
and locknut into the spindle.
housings from the turbocharger. Perform the inspection
Install plain washer and retaining not on
as follows:
spindle but do not tighten at this time.
(1) Remove turbocharger from the engine.
(9) Install fan belts and any other belts which
Refer to TM 5-6115-400-12.
may be driven by fan pulley.
Turn
(2) Place turbocharger on bench with shaft in
adjusting screw in, until fan belts are
horizontal position.
Check for free
properly adjusted, then lock adjusting
rotation of the impellers. If they do not
screw with locknut. Tighten retaining nut
turn freely the trouble may be caused by
securely.
carbon accumulation behind the turbine
impeller, the impeller shaft bearings
seized to the shaft, dirt in bearings, or by
excessive bearing wear. Make repairs
necessary to eliminate these conditions.
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