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3-37 SERVICING ENGINE
PiSTON DIAMETER
Using
a
micrometer, measure the piston outside
diameter at the
place
shown
in Fig. If the
rneasure-
ment
is less
than the limit,
replace the piston.
PISTON TO CYLINDER CLEARANCE
As a result
of
the above measurement,
if
the piston
clearance exceeds the following
limit, overhaul the
cylinder and use
an
oversize
piston,
or replace
both
cylinder and piston.
Piston oversize
0.5, 1
.Q
rnm
PISTON RING TO GROOVE CLEARANCE
Using
a thickness
gauge, measure the
side clear-
ances
of the 1st
and
2nd
rings. If
any of the
clearances exceeds the limit, replace both piston
and
piston rings.
Service
Limit
Service Limit
' .
0.120 m m
(0,0047 in)
Piston ring
to groove
clearance
71.880
mm
(2.8299
in)
09900 -
20803
Piston ring
Service Limit
0.38
mm
(0.007
in)
2nd
0.15 mrn (0.006
in)
Thickness
gauge
Piston ring
groove
width
09900
- 20203
Micrometer (50
-
75
rnm)
Piston ring thickness
Piston ring
I st
2nd
Oil
Piston ring
Standard
0.975
-
0.990
mm
(0.0384
-
0.0390
in)
2nd
1.170
-
1.190
rnm
(0.0460
-
0.0469
in)
Standard
1.025
-
1.045
mm
(0.0404
-
0.041 1
in)
1.21
-
1.23
rnm
(0.W7
-
O.W8 in)
.
2.51
-
2.53
mrn
(0.099
-
0.100
in)
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