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18
ENGINE
18.4. 17
Checking piston
ring
end gap
001682-10
Check the piston pins
f or
discoloration
or signs of wear.
»
If
the piston pin
shows severe discoloration/signs
of
wear:
Change
the piston pin.
Place
the piston
pin
in
the
connecting
rod and
check the
seating
for play.
»
If
the piston pin
seating
has excessive play:
Change
the
connecting
rod and piston pin.
Place
the
piston pin in
the
piston
and
check
the
seating for play.
If
the piston pin
seating
has excessive
play:
Rep lace
the
pist
on
and,
if
necessary,
the
cylinder and
piston
pin.
Measure
the
piston at the
pist
on skirt,
at right angles
to
the piston pin, at a
distance
f)
.
Guidel ine
Distance
0
7
mm (0.28
in)
Piston -
diameter
Size
I
94.93
... 94.96
mm
(3.7374 ...
3.7386
in)
Size
II
94.94 ... 94.97
mm
(3.7378 ...
3.739
in)
Info
Piston
dimensions
0
are
marked
on
the piston head.
(All 450 models)
Remove
the
piston
ring
from
the
piston.
Place the
piston
ring
in
the
cyli
nder and
align wi
th
the piston
.
Guideline
I
Below
the
upper edge
of
the
cylinder
110
mm
(0.39
in
)
Using
special
tool
0
,
measure
the
end
gap.
Guideline
Piston ring
end
gap
Compression ring
I
~
1.00 mm
(~
0.0394
in)
Oi I
scraper
ring
I
~ 1.20
mm
(~ 0.0472
in)
I
Feeler gauge
(59029041100)
(!!:!
p.
364)
»
If
the end gap is
great
er
than
the
specified value:
Check/measure
the
cylinder.
(
0
p. 190)
»
If cylinder
wear lies
within the specified
tolerance:
Change
the piston ring.
Mount
the piston
ring
with
the marking
facing
upward
.
(All
500 models)
Remove
the
pi ston
ring
from
the piston.
Place
the piston
ring
in
the
cylinder and al ign wi
th
the piston.
Guideline
I
Below
the
upper
edge
of
the
cylinder
110
mm (0.39
in)
Using
special tool
0
,
measure
the
end
gap.
Guideline
Piston ring
end
gap
Compression ring
I
~
1.00
mm
(~
0.0394
in)
Oi I
scraper
ring
I
~
1.20 mm
(~
0.0472
in)
I
Feeler gauge
(59029041100)
(0
p
.
364)
193
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