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TM 55-1905-219-14-10
Start the hone and "feel out" the bore for high
spots which will cause an increased drag on the
stones. Move the hone up and down the bore with
short overlapping strokes about 1 inch (2.54 cm)
long. Concentrate on the high spots in the
first cut. As these are removed, the drag on
the hone will become lighter and smoother. Do
not hone as long at the air inlet port area as
in the rest of the bore because this area, as
a rule, cuts away more rapidly. Feed lightly
to avoid an excessive increase in the bore diam-
eter. Some stones cut rapidly even under low
When the bore is fairly clean, remove the hone,
inspect the stones and measure the bore. Deter-
mine which spots must be honed most. Moving the
hone from the top to the bottom of the bore will
not correct an out-of-round condition. To re-
main in one spot too long will cause the bore to
become irregular. Where and how much to hone can
be judged by feel. A heavy cut in a distorted
bore produces a steady drag on the hone and makes
it difficult to feel the high spots. Therefore,
use a light cut with frequent stone adjustments.
Wash the cylinder block thoroughly after the bor-
ing operation.
d. Check the cylinder block bores:
Visually check the contact area as revealed by
the honed surface. There must not be any low
spots which are larger in area than a half


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