TM 1-2840-252-23-2
4-62
INSTALL SECOND TURBINE NOZZLE, SPACER, CASE, AND BUMPER
4-62
(AVIM)
Measure first turbine disc assembly (4) tip
5.
clearance at 0, 45, 90, 135, 180, 225, 270, and
315
degree positions as follows:
a.
Insert thickness gage (Appendix E) (5) between
blade
tip (6) and turbine rotor case inside diameter (7).
b.
Rotate
first
turbine
disc
assembly
(4)
counterclockwise
one revolution for each check.
c.
Tip clearance shall be 0.019 inch minimum.
If tip clearance is less than 0.019 inch, loosen
d.
bolts (3) and reposition turbine rotor case (1).
Tighten
bolts (3) and repeat steps a thru c.
If tip clearance is still less than 0.019 inch,
e.
INSPECT
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