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Kawasaki KZ1300-A1 Quick Reference Manual Page 184

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MAINTENANCE--ENGINE
~
1.
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: : :
:fm:~:
piston, or the pi.ton ring groove
•.
2.
Never clean the piston head. with the engine a.-
sembled.
If the carbon i. scraped from the pi.ton
head. with the cylinder left in place, carbon particle.
will unavoidably drop between the piston. and cylin-
der wall.
·
onto the rings and eventually find their way
into the crank chamber. Carbon particles, which are
very abra.ive, drastically
shorten
the life of the ring',
piston., cylinders, crank.haft bearings, and oil seals.
Piston ring, piston ring groove wear
Visually inspect the
piston
rings and the piston ring
grooves.
If the rings are worn unevenly or damaged
,
they must be replaced.
I
f the piston ring grooves are
worn unevenly or
damaged,
the
piston
must be replaced
and fitted with new
rings.
With
the piston rings in their 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, re-
place the
piston
.
A. Thickne .. Gauge
Table H31
Piston Ring/Groove Clearance
Top
2nd
Service
Limit
0.17
mm
0.16 mm
Table H32
Piston Ring Thickness
Service Limit (Top & 2nd)
0.90 mm
Table H33
Piston Ring Groove Width
Top
2nd
Oil
Service
Limit
1.12 mm
1.11 mm
2.61 mm
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 paralled
to the
groove surfaces.
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 H34
Piston Ring End Gap
Service Limit
(Top
&
2nd)
I
0.7 mm
NOTE:
The service limit is effective also for the
bored
cylinder, oversize
piston
,
and
piston
rings.
Piston, piston pin, connecting rod wear
Measure
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 limit,
replace the connecting
rod.
A. Connecting Rod Small End
184

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