100-214-251 REV. 05 113
7.1.2.1Stack Reconditioning Procedure
To recondition stack mating surfaces, take the following steps:
Table 7.1 Stack Reconditioning Procedure
Step Action
1
Disassemble the Converter-Booster-Horn Stack and wipe the mating surfaces
with a clean cloth or paper towel.
2
Examine all mating surfaces. If any mating surface shows corrosion or a
hard, dark deposit, recondition it.
3 If necessary, remove the threaded stud from the part.
4
Tape a clean sheet of #400 (or finer) grit emery cloth to a clean, smooth, flat
surface (such as a sheet of plate glass), as in Figure 7.1 Reconditioning Stack
Surfaces.
5
Place the interface surface on the emery cloth. Grasp the part at the lower
end, with your thumb over the spanner-wrench hole, and lap the part in a
straight line across the emery cloth. Do not apply downward pressure — the
weight of the part alone provides sufficient pressure.
6
Lap the part, two or three times, in the same direction against the emery
cloth (Figure 7.1 Reconditioning Stack Surfaces).
7
Rotate the part 120 degrees, placing your thumb over the spanner-wrench
hole, and repeat the lapping procedure in step 6.
8
Rotate the part another 120 degrees to the next spanner-wrench hole, and
repeat the lapping procedure in step 6.
9
Re-examine the mating surface. If necessary, repeat steps 2-5 until you
remove most of the contaminant. Remember, this should not require more
than two to three complete rotations for an aluminum horn or booster; a
titanium component may require more rotations.
10
Before re-inserting a threaded stud in an aluminum booster or horn:
• Using a file card or wire brush, clean any aluminum bits from the knurled end of
the stud
• Using a clean cloth or towel, clean the threaded hole
• Examine the knurled end of the stud. If worn, replace the stud. Also, examine the
stud and threaded hole for stripped threads
CAUTION
Threaded studs cannot be reused in titanium horns or boosters. Replace all studs in
these components.
11
Assemble and install the stack, referring to Section 4.8 Assemble the Acoustic
Stack.
100-214-251 IWoper.book Page 113 Friday, June 16, 2017 4:12 PM
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