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66
18
19
20
21
22
23
24
25
OPERATION
No.
ID
112-4
: Work
on the cylinder
head
ID
19
TOOLS
Remove
the
rocker
assembly
fixing
nuts.
Remove
the
assembly
and
the
caps
(52)
. . . . . . . . . . . .
. . . . . . . . . . . . . .
.
.
.
12 mm
box
spanner
To
strip
the
rocker
assembly:
Remove
washer
(37),
the
spring
(29)
and
the
rocker
(36
or
38)
Remove
the
expandable
washers
from
the
shaft
with
a punch.
These
washers
must
be
renewed
after
each
dismantling
operation.
Carefully
clean
the
interior
of
the
shaft
with
a metal
pin
and
make
sure
that
the
lubrication
holes
are
not
blocked.
NOTE
- To
replace
a bracket
it is
necessary
to
remove
the
inlet
rocker
shaft
(see
this
operation,
paragraph
5).
Assembly
(see
Pl.
1 and
3)
To
assemble
the
rocker
assembly:
a)
Before
fitting
the
shaft
expansion
washers,
smear
the
washer
seating
faces
with
"Hermetic".
b)
To
fit
the
rocker
in
position:
1st
and
3rd
cylinders:
place
on
the
shaft,
starting
from
the
front,
a spring
(29),
the
rocker
(38)
and
a washer
(37).
2nd
and
4th
cylinders:
place
on
the
shaft,
starting
from
the
front,
a washer
(37),
the
rocker
(36),
and
a spring
(29).
Place
the
shaft
in
position
on
its
bracket
with
the
lubrication
holes
towards
the
bottom.
Fit
the
caps
(52)
on the
fixing
studs.
Tighten
the
nuts;
when
tightening
make
sure
that
the
spherical
end
of the
adjusting
screw
engages
properlyinthe
socketonthe
push
rod
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 mm
box
spanner
Adjust
the
clearance
of
the
valve
rockers
to
0.008"
(OS20
mm)
for
the
inlet
valves
and
0.010"
(0.25
mm)
for
the
exhaust
valves
(see
Op.ID
112-O).
Fit
the
cups
(1)
and
the
sealing
gaskets
(2)
on
the
sparking
plug
tubes.
Fit
the
cylinder
head
cover,
the
gasket
being
secured
with
"Hermetic"
to
the
cylinder
head
only.
Tighten
the
fixing
nuts
(leather
and
plain
washers)
.
. .
. .
12 mm
box
spanner
Fit
the
fourth
sparking
plug
(spanner
1603-T,
see
Pl.
16,
fig.4).
Fit
the
bakelite
(42)
and
rubber
(41)
caps
on the
sparking
plug
tubes.
Connectthe
sparking
plug
leads
. . . . . . . . . . . . . . . . . . . . . . . . . . . ..".........................
Spanner
1603-T
Fit
the
air
filter
and
tube
assembly.
Tighten
the
fixing
nuts
(spring
washers).
Tighten
the
clip
securing
pipe
to
carburettor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-17
mm
box
spanner
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