Technical data
8’
~
‘,
ENGINE MAIN MECHANICAL U~NIT
(2) Set the camshaft in rest position
(no
ca”
engaged; valves
closed).
(3)
F,it
the~cylinder
heads with
crank-
shaft
sipport
on the cylinder
,block,
and
~ifis&the
appropriat’e
gasket.
Proceed
as
‘per
(Alfa]
from
Step;(t).
l
Step
18.
‘Installé
timing belts.
(1)
Fit~
camshaft drive pulleys and
tighttin
‘he’
retaining screw to specified
torque being caeeful, at the same time,
to
stbp~
ptlley
rotation by
tieans
of
toothecj
spanner
A.5.0195.
$
:
Tightening
torque
Camshaft pulley retaining
scr3v.
~ 83
+
70
N.m
~
(6.4
+
7.1
Kg.m)
‘8
(2)
Vdrify that the crankshaft’s
anqu-
lar
$ositiM
co’rresponds
to the Top
Dead
@enter
of cylinder No. 1, in the
explb<ion stroke (alignment between
notch
;‘T”
on flywheel and rear caver
refererce
mark).
(3)
R;!ate
crankshati
counterclock-
wise
(,seen
from rear side) by
45O
in
order
io
tiove
piston of cylinder No. 2
backwarc(s’so
a,s
to prevent valves
strik-
ing
again?
piston
during
camshaft
rotati&.
~
(4)
,Pysifion
the left camshaft SO that
the topth and the two adjacent milled
groovys of the left timing pulley are
visibleithrough
the appropriate hole on
rear
gIuard
0,
PA3d3500883300
b
2
1
Timing
belt
rear
qover
2 Left timing pulley
(5) Realign notch
“T”
on flywheel ~
with the fixed reference mark (piston
of cylinder No. 1 ‘at T.D.C. in the
,ex-
plosion stroke) and, keeping shafts in
this position, fit the left
timihg
belt cinto
pulleys.
The belt
shall
be fitted with its
drag-
ging
side,
opposed to straighteners,
under tension.
(6) Loosen the nut securing the belt
straightener SO that it
cari
exert~the
spring load on the belt.
(7)
Rotate the crankshati
45O
to move
piston of cylinder No. 1
backwards#so
as to prevent valves striking against
piston itself when positioning the
cam-
shaft.
(6) Position the right-hand camshaft
SO that the
toot,h
and the two adjacent
milled grooves of right-hand
tiniing
pulley are
visiblesthrough
the
appropri-
ate
hole
on rear guard
0;
then bring
the crankshaft back in the position,
in-
dicated in Step (2) and fit the timing
belt
onto
pulleys.
CAUTION:
Pulley tends to
rotate
with respect
to correct
position
sincb
camshaft
interacts
With
the intake
&lve
of
cylinder No. 3. For
thisreason,
use
appropriate
wrench
A.5.0195 in
ord-
er to keep the pulley in
the--correct
position for
belt
installatic@.
1
Timing
belt
rear guard
2 Right-hand timing pulley
(9) Verify that distance “S” between
timing belt and contour of engine front
support is not less than the minimum
value prescribed.
Minimum distance “S” between
timing belt and engine front
support:
9 mm
(11)
Rotate
crankshaft in jhe function-
ing-direction SO as to permit belts to
assume their final position.
(12) Rqtate crankshaft until piston of
cylinder No. 1
‘is
at its T.D.C. in the ex-
plosion stroke. (Notch “T” on flywheel
alignerj with reference mark). Then,
further’rotate the crankshaft counter-
clockw’ise
(seen
from rear side) until
notch
v
on flywheel is aligned with the
reference mark (right-hand camshaft
l
in rest position, no cam engaged).
May
1988