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Measuring Critical
Components
CYLINDER TRUENESS
1.
Measure each
cyl inder
in
t he
th
ree
locat
ions
shown
from
fro
nt
to bac
k
and
side
to side
for
a
total
of six
readings. The trueness
(out-of-
roundness)
is
the
difference between
the
highest and
lowest reading.
Maximum
true-
ness
(out-a
f-
roundness) must not
exceed
speci
f
ications
li
sted.
Fig. 2·64
CYLINDER TRUENESS LIMIT
mm
in.
0.1
0.0039
PISTON SKIRT/CYLINDER CLEARANCE
1.
Measure
each cyl inder
front to back
about 2.5
cm (1
in.)
from the bottom
of each
cylinder.
2.
Measure the
correspond
ing
piston diameter
at a
point
1
cm
(0.394
in.)
above
the piston
24
sk irt at a
right ang le
to
the p iston-p
in
bore.
Subtract
this
measurement
from the
meas-
urement
in
step
1. The
difference (c learance)
must
be
within specif ications.
Fig.
2·66
A671
PISTON SKIRT/CYLINDER CLEARANCE
RANGE
mm
in.
500 F/C
0.084-0.15
0.0033-0.0060
530
UC
0.113-0.15
0.0044-0.0060
440 UC
0.076-0.15
0.0030-0.0060
PISTON·RING
END
GAP
Place
each'
piston
ring
in the wear portion
above
the
exhaust port of its
res
pective
cy
li
nder.
Use
the piston
to
positio
n
each
ring
squarely in each cylinder.
Using a fee ler
gauge,
measure each piston-
ring
end
gap. Acceptab le
ring end
gap must
fall
within specifications.
PISTON·RING END GAP RANGE
mm
I
in.
0.20-0.83
I
0.008-0.033
(
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