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Measuring Critical
Components
CYLINDER TRUENESS
1.
Measure each cylinder
in
the three loca-
tions shown from front to back and side to
.
side for a total of six readings. The
trueness (out-of-roundness) is the
dif-
ference between the highest and lowest
reading.
Maximum trueness
(out-of-
roundness) must not exceed specifications
listed.
Fig. 2·54
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CYLINDER TRUENESS
l!.IMIT
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PISTON SKIRT/CYLINDER CLEARANCE
1.
Measure
each
cylinder front to
back about
2.5 cm
(1
in.) from
the
bottom
of each
cylinder.
2.
Measure the
corresponding
piston
diameter at
a point 1 cm (0.394 in.) above
the piston
skirt at a
right
angle
to the
piston-pin
bore.
Subtract this measure-
ment from the
measurement
in
step
1.
The
difference
(clearance)
must
be
within
specifications.
Fig. 2-56
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PISTON SKIRT/CYLINDER CLEARANCE RANGE
•
mm
In.
5000
0.04-0.15
0.00
15-0.0060
6000
0.095-0.150
0.0037-0.0060
PISTON-RING END GAP
1.
Place
each piston
ring in
the wear portion
above
the
exhaust port of
its
respective
cylinder.
Use the piston to position
each
ring squarely in
each cylinder.
2.
Using a feeler
gauge,
measure
each
piston-
ring
end
gap. Acceptable ring
end
gap must
fall within specifications.
Fig. 2·57
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