Turbocharger

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.