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CYLINDERS
·
PISTON· PISTON RINGS
(See
fig.
182 and 183)
SELECT
roN OF CYLINDER OIA
CIJoSS
·
4
_
ClASS
•
••
Cl..0.5S
•
c_
83.000
83.006
83.012
83.006
83,0 12
83.018
Cylinders must always be
matched
wi th pistons of same class.
SELECTION
OF PISTON
DIA
cv.ss
•
A.
CIJoSS
•
•
•
CCASs.
c.
82.968
82.974
82.960
82.974
82.960
82.986
Pistons
must
always
be matched
with pistons
of same class.
PI STON
RINGS
(See
fig.
183)
-
n.
2 upper compression rings
I2l 83
rnm -
th
ick.
mm
1.478-1.490
-
n.
1
intermediate oil scraper
ill
83
mm •
thick.
mm
1.478-1.490
-
n.
1
lower oil scraper
12'
R3
mm
-
thick.
mm 3.978-3.990
PISTON PIN
(See
Ii;.
183)
-
Length:
mm
59.97G-59.984
-
0
mm 22.000
-;-
22.!XI4.
CRANKPIN
DIAMH
ER
SEI.!CTlON
OII'CI ....
L
~
> .•
-
•
A.
white
m ark on
44.008
-;-
44.014
shoulder,
flyw hee
l
43.754
Side
.
B.
wh
ite
mark
on
44.014
-;-
44.020
shoulder,
flywheel
side
-
piston pin
coupling:
pray mm
0.006
10
II
mm 0.004.
negative clearance of
,
REMOVAL
OF
PIN
FROM
PISTON
Aller removal of cirClips.
use
1001
n. 13907660
(57
in
fig.
181)
to
slide pin oul of piston and
con-rod small end.
CRANKSHAFT
(See
fig.
184)
TM
r>n!y
chang9 is in crankp in dia.
(see follow-
ing
ta
ble):
O\IEIISI~ 1I£A~'?tC
..
-
.~
•.
m
+
43.766
43.500
-;-
43.512
43.246
-;-
43.258
Clearance between crankpln and
bearing
.
min.
0.030
-
max.
0.054.
Remark: Nitride
treated
crankShafts. For event ual adjus tments send them back
to
• SEIMM
M
OTO
GUZZlo
.
CRANKSHAFT BALANCING
Static balancing of crankshaft
is
obtained by
applying a
weight
of
kg
1.586
-;-
1.616.
Max.
offset
in
axis
parallelism:
cran kpin and
main
be aring pin
ml.lst
not overcome mm
0,02
at
mm 40.
TIMING DATA
(See
chapter. Timing data
oj
Timing
da ta
(referred to
the clearance
01 1.5
mm
between roc ker
and
valve) are the
follOW-
ing (see
lig. 185):
-
inlet:
opens
20"
before TOC
closes
52"
after BOC
-
exhal.lst:
opens 52"
befo
re
BOC
closes
20"
alter
TOC
Normal rocker clearance
(cold engine)
mm 0.22
.
. .
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