TM 1-2840-252-23-2
4-50
INSTALL FOURTH STAGE POWER TURBINE NOZZLE (AVIM) (Continued)
4-50
NOTE
If Dimension G is 0.001 inch or greater, proceed to
step 27.
NOTE
SHIM SELECTION TABLE
PART NUMBER
SHIM THICKNESS
To maintain axial clearance between screw heads
2-141-422-01
0.010 inch
(outer circle) and fourth turbine rotor blade rivet
2-141-422-02
0.020 inch
heads, clearance should be held as close to
2-141-422-03
0.040 inch
minimum as possible.
j.
If required, select shim from shim selection
table to a maximum of 0.080 inch. Add shim at
outer flange to achieve clearance of 0.001 to
0.050 inch at inner bolt circle mounting surface.
Example If dimension G is -0.039 inch, select
shim Part No 2-141-422-03. Clearance will be
0. 001 inch. If dimension G is -0.019 inch,
select shim Part No 2-141-422-02. Clearance
will be 0.001 inch.
26.
Install shim (36), selected in previous step j on inner
bolt circle on aft face of fourth turbine nozzle
assembly (34).
27.
Coat 20 bolts (32) and 22 new screws (37) with anti-
seize compound (E6).
CAUTION
In following step 28, be sure to use 22 new screws.
Used screws could break and cause damage to
engine. Outer screws are to be torqued first to
reduce breakage.
Install heat shield (35),22 screws (37) and 20 bolts
28
(32). Torque screws (37) to20 to 25 inch-
pounds, then torque bolts (32) to70 to 95 inch-
pounds. Lockwire screws (37) and bolts (32). Use
lockwire (E33).
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