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 TM 55-1905-220-14-10
5-43. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
INSPECT (Cont)
NOTE
Before attempting to check the block bores, hone them
throughout their entire length until about 75% of the area above
the ports has, been cleaned-up.
c. Hone the block bores as follows:
(1) Use a hone in which the cutting radius of the stones can be set in a fixed
position to remove irregularities in the bore rather than following the
irregularities as with a spring- loaded hone. Clean the stones frequently with a
wire brush to prevent stone loading.
Follow the hone manufacturer's
instructions regarding the use of oil or kerosene on the stones. Do not use
such cutting agents with a dry hone. Use 120 grit stones.
(2) Insert the hone in the bore and adjust the stones snugly to the narrowest
section. When correctly adjusted, the hone will not shake in the bore, but will
drag freely up and down the bore when the hone is not running.
(3) 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 diameter. Some stones cut
rapidly even under low tension.
5-630
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