5.1
ENGINE
BODY
68
mm
STROKE
SERIES
WSM,
01 161
Factory
spec.
[2]
PISTON
AND
CONNECTING
ROD
,
20.000
to20.013
mm
0.78740 to 0.78791 in.
I
C083F040
I
Oil
clearance
between piston pin
and small end
bushing
C019F053
Factory 0.014 to
0.038
mm
spec.
Allowable
0.10
mm
limit 0.0039 in.
0.00055
to
0.001 50
in.
I
(When removing) (When installing)
I8083F054
Piston Pin-Bore
I.D.
1.
Measure the
I.D.
of
the piston pin-bore in both the
horizontal and vertical directions with
a
cylinder
2.
If the measurement exceeds the allowable limit,
replace
the
piston.
.
gauge.
I
20.05
mm
I
I
k!?Yble
I
0.7894in.
Oil
Clearance between Piston Pin and Small End
Bushing
1.
Measure
the
O.D.
of
the
piston pin where
it
contacts
the
bushing with an outside micrometer.
2.
Measure the
I.D.
of the small end bushing with an
inside micrometer, and calculate the oil clearance.
3.
If the clearance exceeds the allowable limit,
replace the bushing. If
it
still
exceeds the
allowable limit, replace the piston pin.
I
20.002 to 20.01
1
rnm
I
0.78748 to 0.78783 in.
I
spec.
Factory
I
Piston
pin
0.0.
Small end bushing
20.025 to 20.040
rnm
1
1.0.
I
spec.
Factory
I
0.78839to0.78897in.
I
Replacing Small End Bushing
(When removing)
1.
Using
a
small end bushing replacing tool (see page
(When installing)
1.
Clean
a
new small end bushing and small end hole,
and apply engine
oil
to them.
2.
Using
a
small end bushing replacing tool, press in
a
new bushing (service parts) taking due care to
see
that the connecting
rod
hole matches the bushing
hole.
5-53),
press out the used bushing.
[Service parts dimension]
Factory 0.015 to 0.075
mm
0.00059 to 0.00295 in.
between piston pin
Oil clearance
and small end
bushing
limit
0.0039 in.
5-93
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