CONNECTING RODS AND PISTONS
TIP
~~~~~~~~~~~~~~
Use the piston crown
to
le
ve
l the piston ring
ne
ar
bottom
of
cylin
der
"a", where cylinder wear is
lowest.
3. Measure:
• Piston ring end gap
Out
of
specification -> Replace the piston
ring.
TIP
~~~~~~~~~~~~~~
The o
il
ring expander spacer's end gap cannot
be
measured. If the oil ring rail's gap is exces-
sive, replace a
ll
three piston rings.
Top
ring
End
gap
(installed)
0.15-0.25
mm
(0.0059-0.0098 in)
Limit
0.50
mm
(0.0197
in)
2nd
ring
End
gap
(Installed)
0.30-0.45
mm
(0.0118-0.0177 in)
Limit
0.
80
mm
(0.0315
In)
Oil ring
End
gap
(installed)
0.
10-0
.40
mm
(0.0039-0.0157 In)
--
,
b. Upper of cy
li
nder
CHECKING THE PISTON PIN
The following procedure applies to all of the pis-
ton pins.
1. Check:
• Piston pin
Blue discoloration/grooves
->
Replace t
he
piston pin and then check the lub
ri
cation sys-
tem.
2. Measure:
• Piston pin outside diameter "a"
Out
of
specification -> Replace t
he
piston pin.
/
Piston pin outside diameter
16.990-16.995
mm
(0.6689-0.6691 in)
Limit
16.970
mm
(0.6681
in)
3. Measure:
• Piston pin
bor
e inside diameter "b"
Ou
t
of
specific
at
ion
->
Replace the piston.
Piston pin
bore
inside diameter
17.002- 17.013
mm
(0.
6694-0
.6698 in)
Limit
17.043
mm
(0.6710
in)
__
__:._v
rip!....l::...J_j
J
,
4.
Ca
lculate:
• Piston-pin-
to
-piston-pin-bore clearance
Out of specification
->
Replace the piston pin
and piston
as
a
se
t.
Pist
on-p
in-to-pist
on-p
in-
bo
re clearance =
Piston pin bore inside diameter "b" • Piston
pin outside diameter "a"
EAS 1
AC1!K).t
Piston-pin-
to
-piston-pin-
bore
clearance
0.007-0
.023
mm
(0
.
0003-0
.0009
in)
CHECKING THE CONNECTING RODS
1.
Measure:
• Crankshaft
-p
in
-t
o·big-end·bearing clearance
5-63
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