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 TM 55-1905-220-14-10
5-9. FUEL INJECTOR-MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-LAPPING (Cont)
d. After each four or five passes,
clean the lapping powder from the
part by drawing it across a clean
piece of tissue placed on a flat
surface and inspect the part. Do
not lap excessively (refer to the
chart on minimum thickness).
PART NAME
MINIMUM THICKNESS
Tip, Spray (Shoulder)
.199
Cage, Check Valve
.165-.163
Valve, Check
.022
Cage, Valve Spring
.602
e. When the part is flat, wash it in
cleaning solvent and dry it with
compressed air.
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 exces-
sively. 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.
h. Wash all of the lapped parts in
clean fuel oil and dry them with
compressed air.
5-277
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