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1. :~:nn~:~~vi~;ra;:~b~~~ ~~:: :;:~:
piston, or the piston ring
grooves.
2. Never clean the piston heads with the piston
installed.
If
this
is
done, carbon particles will unavoidably drop
between the pistons and
cylinder
walls
and
eventually
find their
way
into
the crank chamber.
Carbon
particles, which are very abrasive, drastically
shorten the
life
of the rings, pistons, cylinder,
crankshaft bearings, and oil seals.
Piston ring, piston
ring
groove
wear
Visu
ally
inspect the
piston
rings
and
the
piston
ring
grooves.
If
the rings are worn
unevenly or
damaged,
they must be replaced
.
If
the piston
ri
ng
grooves
are
worn
unevenly
or
damaged, the piston mu st be
replaced
an
d fitted
with
new
rings.
With the piston
rings in
thei
r
grooves,
make
several
measurements
with
a
thickness
gauge
to
determine
piston ring/groove clearance.
If
the
clearance exceeds
the
service
limit, measure
the
thickness
of
the
piston
rings
and the
width
of the
ring
grooves.
If the
ring
has
worn down
to
less
than the service
limit,
replace
the ring;
if
the
groove
width
exceeds the service
limit,
replace the piston.
A.
Thickness
Gauge
Table
H30
Piston Ring/Groove Clearance
Standard
Service
Lim
it
Top
Ring
0.01
-0.05
mm
0.15
mm
2nd Ring
0.04-0.08 mm
0.18
mm
Table H31
Piston
Ring
Thickness
Standard
Service
Limit
Top
Ring
1.47-1.49
mm
1.4
mm
2nd Ring
1.1'7-1 .19mm
1.1 mm
Table H32
Piston
Ring Groove
Width
Standard
Service Limit
Top
Ring
1.50-1.52 mm
1.6
mm
2nd
Ring
1.23-1.25 mm
1.3 mm
MAINTENANCE-ENGINE 129
When
new rings are being fitted
into
a used piston,
check for
uneven groove
wear by inspecting the ring
seating.
The
rings
should
fit
perfectly
parallel to the
groove
su rfaces.
If
not, the
piston must
be
replaced.
Piston ring
end
gap
Place
the
piston
ring
inside
the
cylinder,
using
the
piston
to
locate the
ring
squarely in
place.
Set
it
close
to the
bottom
of the cylinder, where cylinder wear
is
low.
Measure the
gap between the
ends of
the
ring
with a
thickness gauge.
If
the
gap is
wider
than the
service limit,
the
ring is overworn and must be
replaced.
A.
Piston Ring
Table H33
Ring End Gap
Standard
Service
Lim
it
Top Ring
0. 15-0.35
mm
0.7 mm
2nd Ring
Oil
Ring
0.15-0.75
mm
1.1 mm
Piston,
piston
pin,
connecting
rod wear
Measu
re
the diameter
of
the piston pin
with a
micrometer,
and
measure
the inside diameter of
both
piston
pin
holes in
the piston.
If the piston
pin
di-
ameter
is less
than
the service
limit
at
any point,
replace
the
piston pin.
If
either
piston
pin
hole
diameter
exceeds
the service
limit,
replace
the
piston.
Measure
the
inside diameter
of the
connecting rod
small end
.
If
the
diameter exceeds the service lim
it1
replace
the
connecting rod
..
A. Connecting Rod
Small End

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   Also See for Kawasaki Z250 1981

This manual is also suitable for:

Kz350 1981

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