ARMY
TM 5-6115-61234
NAVY AG-320B-WME-00
8-4. OVERHAUL OF TURBINE ASSEMBLY.
(cont)
e. Assembly and Balance of Rotating Group
Assembly. (cont)
(15) Disassemble stackup down to labyrinth seal
(19) and thoroughly clean components with alcohol
f.
Reassembly
NOTE
To establish proper shimming of the
compressor wheel It is necessary to
complete steps (1) thru (8) checking the
clearances as described In step (9)
These steps may need to be repeated
several times until the proper clearances
are
established
Until
the
proper
shimming Is achieved, use an old
bearing (41, Figure 8-6) DO NOT install
a new bearing (41) until shimming is
correct.
(1)
Install bearing (41) in bearing housing (36).
(2)
Install fabricated tool (FT-21498, Figure 8-
10) In bench vise Place bearing housing (36, Figure 8-6)
in fabricated tool (FT-21498, Figure 8-10) and bolt In
place
(3)
Install bearing retainer nut (40, Figure 8-6)
Use fabricated tool (FT-21583, Figure 8-10) and torque
nut to 600 inch pounds (67 8 Nm).
(4)
Remove bearing housing from fabricated
tool (FT-21498).
NOTE
Both tab washer (38, Figure 8-6) and
shims (37) can be Installed in one
direction only.
(5)
Install jackscrews In bearing housing (36).
Install tab washer (38) and shim set (37) on jack screws
The shim set (37) should be the thickness measured on
tear-down for the first attempt Modify shim set thickness
per measurements in step (9)
CAUTION
To prevent damage to throat of
compressor inlet housing (3), insert
bearing
carrier
into
inlet
housing
carefully.
(6)
Using jackscrews as a guide and to keep
shims In place, place bearing housing (36) In
compressor inlet housing (3) Secure with washers (35)
and bolts (34) Torque bolts to 70-88 Inch pounds (7 91-
9 04 Nm)
CAUTION
To ensure proper balance of turbine assembly, make
sure that matchmarks on all parts of rotating group
assembly aline.
(7)
Install compressor wheel (33)
CAUTION
If jam nut Is too tight, distortion of
bearing and improper shimming will
result.
(8)
Place compressor inlet housing containing
bearing carrier and compressor wheel on fabricated tool
(FT-21360, Figure 8-14). Add dummy lab seal and Inner
race of bearing to back of compressor Impeller Tighten
jam nut just light enough to ensure that inserting wire
gages does not tip compressor wheel.
8-34 Change 4
