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TM 55-2915-335-30&P
2-21. PUMP COVER AND INLET SEAL- lNSPECT/REPAIR/REPLACE (Cont)
2-21
f.
e. Use outside caliper to measure seal height, dimen-
sion B. If seal height is less that 0.201 inch, replace
seal.
Visually check condition of inlet seal seat surface
C. If wear grooves can be seen, or if surface looks
dull, lap seat per paragraph 3.
3. REPAIR INLET SEAL SEAT
a.
b.
c.
d.
e.
Place sheet of 600 grit, wet or dry emery paper on
inspection surface plate or pane of glass. Place seal
(6) on emery paper with seal seat down, as shown.
With light and even pressure, move seal in figure-8
path. Make only three or four passes.
Check seal surface condition. If necessary, make
three or four more passes and recheck seal sur-
face. Repeat lapping operation until grooves are
gone.
Wipe off surface plate with clean cloth and replace
emery paper with plain white bond paper. Repeat
figure-8 pattern on paper to polish seal surface to
a mirror finish.
Visually check seal surface condition. Surface must
reflect light evenly.
Measure seal height B per paragraph 2.e, INSPEC-
TION. If seal height is less than 0.201 inch, replace
seal.
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