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Using a cylinder gauge, measure the cylinder bore at three different
places
in X and Y directions, and if necessary,
r~bore
the cylinders
to
oversize
or
replace
the
block
if
beyond
repair.
X-X/is
th~
thrust
direction
Piston, Piston Pin and Piston Ring
Check the piston for
evidence of seizure, streaks and wear,
and if
defective, replace.
Measure
the
0.0.
of
the
piston,
and
if
excessive wear
is
found,
replace.
If
the piston
to
cylinder
wall
clearance
is
excessive,
rebore the cylinder to the next oversize or replace the piston.
The
piston 0.0. should be measured at the lower part of the skirt across
the thrust faces.
When
an
oversize
piston
is
used,
finish
the
cylnder
bore
oversize
as
well.
First,
measure
the
outside
diameter of the oversize piston to be
used (diameter in the thrust direction
at
the
lower
part
of
the
piston
skirt),
rebore
the
cylinder
so that
the clear ance between the piston and
the cylinder
wall will be
the value
specified
in
the
data
section,
and
finally cross finish by honing.
Measure
clearance,
the ring.
excessive
piston.
the
piston
ring
side
and
if
necessary,
replace
If the clearance is still
with a new ring, replace the
Measure piston ring end gap,
and
if
the end gap is excessive, replace the
ring.
50
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