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TM 55-2915-335-30&P
2-19. IMPELLER - lNSPECT/REPAIR (Cont)
2-19
3. REPAIR
a. Place a sheet of 600 grit wet or dry emery paper on
an inspection surface plate or pane of glass. Place
b.
c.
d.
e.
f.
impeller seal surface down on emery paper.
Apply light and even pressure on impeller drive
boss with index finger.
Lap seal surface by sliding impeller across emery
paper in a figure 8 path. Make only 3 or 4 passes
before checking surface.
When grooves are gone, wipe off surface plate
with a clean cloth. Replace sandpaper with plain
bond paper. Repeat lapping operation on paper to
polish the seal surface to a mirror finish.
Visually check seal surface condition. Surface must
reflect light evenly.
After lapping, check impeller height with an out-
side caliper per Step 1 of INSPECTION. If impel-
ler height is less than 0.585 inch (14,85 mm), im-
peller cannot be reused.
NOTE
FOLLOW-ON Maintenance: Install impeller, armature, and
field tube assembly (paragraph 2-18).
END OF TASK
2-66
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