j. Oil passages in the thrust collar must be open
The thrust faces must not be warped or
The ring groove shoulders must be free of
The bearing area width should not exceed
The ring groove width must not exceed
0.0665 inch. Check the clearance between the thrust
collar and the thrust bearing with a feeler gauge.
Clearance should be between 0.001 and 0.004 inch at
Replace thrust collar if requirements
are not met.
k. Inspect the shroud for cracks, signs of erosion,
damage caused by rubbing, and distortion. Replace
shroud if damaged.
1. The turbine wheel must not reveal any signs of
rubbing and the vanes must not be cracked, nicked,
or eroded to a feather edge. The shaft must not show
any signs of scoring, scratching or overheating. Use
a micrometer to measure the shaft journals. Replace
turbine wheel and shaft if damaged. The journals
must not be more than 0. 003 inch out of round, and
the diameter must not be less than 0. 3992 inch. The
sealing ring groove walls must be free of step wear.
The sealing ring hub outer diameter is 0. 682 to
0. 683 inch.
Ring groove width is 0.0645 to 0.0665
Replace excessively worn journal.
14-55, Turbocharger Reassembly and Installation.
The tools and workbench must be kept
clean at all times during the reassembly
to prevent the entrance of dirt or foreign
matter. All parts must be free of nicks,
burrs, scoring, and foreign matter.
a. If the inner bearing retainers have been re-
moved from the center housing, install new retainers.
b. Place the center housing on end on the bench.
c, Oil one of the bearings and place it against the
inner bearing retainer.
d, Install the outer bearing retainer.
e. Invert the center housing and install the re-
maining bearing and retainer in the same manner.
f. Insert the turbine and shaft assembly, with
newmetallic seal installed, into a suitable holding
h. Oil the shaft journals. Apply a light, even
coat of oil.
Place the center housing assembly over the
shaft. Press down to seat the metallic seal ring.
Rotate the housing to assure proper seating.
Install a new metallic seal on the thrust collar.
k. Insert the thrust collar in the thrust bearing so
that the metallic seal ring end of the collar is on the
smooth side of the thrust bearing.
1. Install the thrust bearing and collar assembly.
Place the thrust bearing over the pins on the center
housing. The bearing will fit only one way. Press
down to seat.
m. Install a new rubber seal ring.
n. Make certain the thrust spring is installed in
o. Install the backplate. Use care not to damage
the--metallic sealing ring on the thrust collar. Install
Tighten the bolts to 40-60 inch-pounds
torque. Bend up the locking tabs.
p. Install the compressor impeller. Use a
twisting motion to insure that the impeller bottoms
on the thrust collar.
q. Washer face of locknut and the face of the im-
peller must be smooth and clean. Lightly oil the
threads and washer face of the locknut. Install lock-
nut; tighten to 18-20 inch-pounds. Use a sliding T
handle and further tighten locknut through another 90
r. Install the turbine housing, clamps and lock-
Tighten the bolts to 100-130 inch-pounds.
Bend up locking tabs.
s. Refer to the Operator and Organizational
Maintenance Manual and install the diffuser.
t. Install the compressor housing.
u. Install the V-band clamp. Tighten nut to 40-
v. Refer to Operator and Organizational Main-
tenance Manual for installation of the turbocharger.
g. Place the turbine shroud on the shaft.