4-38 INSTALL FOURTH STAGE POWER TURBINE ROTOR (AVIM) (Continued)
25. Check axial clearance between fourth stage
power turbine rotor (4) and fourth stage power
turbine nozzle (24) at blade tips (23). Use
0.115 inch and 0.290 inch bent wire gage
(Appendix E) (46) inserted between fourth
stage power turbine rotor blades (45). Axial
clearance shall not be less than 0.115 inch or
more than 0.290 inch.
If axial clearance is not within limits, do
steps 13 through 25. Ring spacer may be
installed or removed as necessary. Re-
check clearance. If clearance still is not
within limits, replace power turbine as-
sembly (Ref. Task 3-6 and 3-7).
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