821
FIGURE
14.
PISTON GROOVE CLEANING
Inspection
Follow the procedures given below when inspecting
pistons and connecting rods.
Piston Inspection:
1.
Inspect the pistons for fractures at the ring
lands, skirts and pin bosses. Check for wear at
the ring lands using a new ring and feeler gauge
(Figure
15).
Replace the piston when the
side clearance
of
the top compression ring
reaches that specified in
DIMENSIONS AND
CLEARANCES.
2.
Replace pistons showing signs
of
scuffing,
scoring, worn ring lands, fractures or damage
from preignition. Excessive piston wear near the
edge of the top ring land indicates preignition.
FIGURE
15.
CHECKING RING SIDE CLEARANCE
Connecting
Rod
Inspection:
Replace connecting rod bolts and nuts that have
damaged threads. Replace connecting rods that
have deep nicks, signs of fractures, scored bores, or
bores with dimensions which exceed that specified
in
DIMENSIONS AND CLEARANCES.
Measuring Pistons:
1.
Proper piston tolerances must be maintained
for
satisfactory operation.
2.
Refer to
DIMENSIONS AND CLEARANCES
to
determine where to measure piston
to
be sure
the total clearance follows specifications.
s
I
I
MEASURE CLEARANCE
HERE
-d!
10
0
0
0
01
FIGURE
16.
MEASURING PISTON CLEARANCE
10-9
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