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 TM 55-1905-221-14-4
6-31. FUEL INJECTORS (Continued).
LOCATION/ITEM
ACTION
REMARKS
LAPPING (Cont)
f. Place the dry part on the
second block. After applying
lapping powder, move the part
lightly across the block in a
figure eight motion several
times to give it a smooth
finish. Do not lap excessively.
Again wash the part
in cleaning solvent and dry
it with compressed air.
g. Place the dry part on the
third block. Do not use
lapping powder on this block.
Keep the part flat and move
it across the block several
times, using the figure eight
motion. Lapping the dry
part in this manner gives it
the "mirror" finish required
for perfect sealing.
WARNING
Wear protective eye goggles when using compressed air to prevent eye injury.
h. Wash all of the lapped parts
in clean fuel oil and dry them
with compressed air.
i. Only the edge of the hole in
crown valve seat contacts the
valve, this edge must be
nearly perfect, must be a
true circle and present an
unbroken surface. Examine the
edge of the hole under a
magnifying glass for chipping
or cracks. If the edge of
hole shows irregularities,
the hole must be lapped.
6-577
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