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Inspect
the cylinder bore for wear or damage.
Measure the cylinder I.D.
in
X and Y axis at three
levels.
Take t he maximum reading to
det erm
ine t he cylin
-
der wear.
SERVICE LIMIT:
72.
10 mm (2.839
in)
Calculate
t
he piston-to-cylinder
clearance.
Take
a maximum reading to determine the
clear-
ance.
Refer
procedu res for measurement
of
the piston
O.D
(page
12-13).
SERVICE
LIMIT: 0.10
mm (0.004
in)
Calculat
e t he taper and out of round at three levels
in
X
and
Y
axis, Take
t
he maximum reading to
determ
ine them.
SERVICE
LIMITS:
Taper:
0.10
mm
(0.004
in)
Out of round:
0.10 mm
(0.004
in)
The cylinder must be rebored and
an
oversize pis-
ton fitted if the service lim its
are
exceeded.
The following oversize pistons are
available:
0.25
mm
(0.010 in
)
0.50 mm (0.020
in)
The piston to cylinder clearance
f
o
r
the oversize pis-
ton
must be: 0.015-0.050 mm
(0.0006
-
0.0020 i
n).
PISTON ASSEMBLY
Carefully install the
piston
rings into
t
he piston
ring
grooves with
t heir
marking fac ing up.
•
Apply
oil
to the piston rings.
•
Avoid
pist
on and
pist
o
n
ring
damage during
installat
ion.
•
Install the piston rings with the marking
(R)
fac-
ing up.
•
Do not mix the top and second rings; top ring
is
narrower than the second ri ng
in
w idt h.
Stagger the piston ring end gaps 120° apart from
each other.
Stagger the side rail end gaps as shown.
CRANKSHAFT/ PISTON/
CYLINDER
TOP
MIDDLE
BOTIOM
TOP RING
SIDE RAILS
SPACER
12-15
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