(2) Repair nozzle (131) as follows.
c. Repair.
(a) Remove cracks or feathering not
(1) Repair liner (28, fig. 3-12, sheet 1 of 2)
more than 0.060 inch deep on trailing edge of vanes as
as follows:
shown in figure 3-22. Rework of one or more vanes
(a) All cracks are to be repaired by
may be performed without necessarily reworking all
welding except as noted. Weld in accordance with
vanes. When cracks or feathering require removal of
Military Specification MIL-W-8611, using N-155 filler rod
material of more than 0.060 to 0.130 inch deep on
conforming to Military Specification MIL-R-5031, class
trailing edge of vane, all vanes shall be cut back an
9.
identical amount.
(b) Weld cracks connecting any two
(b) Repair erosion of vane leading edge
holes in accordance with Military Specification MIL-
that is less than 1/8 inch deep by blending and fairing to
W6858.
blade contour.
(c) Weld any cracks over 1/8 inch long
(c) Repair scoring that is less than
in accordance with Military Specification MIL-W6858.
0.030 inch deep on shroud by blending to shroud
(d) Replace liner, if buckling is greater
contour.
than 1/8 inch deformation.
(d) Repair damaged or worn stud by
(e) Replace liner, if metal thickness is
building up with weld using inert gas shielded tungsten
less than 0.030 inch due to corrosion or wear.
arc and Rene 41 or 718 welding rod.
Grind to
(f) If practical, weld any group of
dimensions specified in figure 3-23.
cracks which could cause breaking away of material in
(3) Repair exhaust pipe (53, fig. 3-12, sheet
accordance with Military Specification MIL-W6858,
2 of 2) as follows:
otherwise replace liner.
(a) Reweld cracked welds per Military
(g) Weld any cracks separated by less
Specification MIL-W,8611, using N-155 Weld rod.
than inch of material in accordance with Military
(b) If threads of bolt holes are damaged
Specification MIL-W-6858.
beyond repair, plug weld using N-155 weld rod, drill new
(h) Remove and replace damaged
holes through plug weld 0.0211 to 0.219 inch. Counter
cooling skirts. Weld cooling skirts in accordance with
sink 115 to 125 by 0.25 to 0.28 inch diameter. Tap
Military Specification MIL-W-6811, using N-155 filler rod
conforming to Military Specification MIL-R-5031, Class
with by 28 UNF-3B tap. Deburr and inspect.
9.
(4) Repair turbine plenum (50, fig. 3-12,
sheet 2 of 2) as described in figure 3-24.
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