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68
OPERATION
No.
ID
112-4
: Work
on the cylinder
head
ID
19
TOOLS
35
Fit
the
cups
(1)
and
the
rubber
gaskets
(2)
on
the
sparking
plug
tubes
(see
Pl.
1).
Fit
the
cylinder
head
cover,
securing
the
gasket
with
"Hermetic"
to
the
cylinder
head
cover
only.
Tighten
the
nuts
(leather
and
plain
washers).
Fit
the
4th
sparking
plug
(spanner
1603-T,
see
Pl.
16,
fig.
4),
the
bakelite
(42)
and
rubber
(41)
caps
(see
Pl.
1)
of the
sparking
plug
tubes.
Connect
the
sparking
plug
leads
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
Fit
the
air
filter
and
tube
assembly.
Tighten
the
fixing
nuts
(spring
washers).
Tighten
the
clip
securing
the
piping
onthe
carburettor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37
(See
paragraphs
26 to
36,
this
operation).
38
39
40
41
42
REPLACEMENT
OF
A VALVE
SPRING
NOTE
- This
operation
is
only
an
emergency
repair.
If the
engine
has
been
running
for
some
time
with
a broken
valve
spring,
the
valve
will
have
to
refaced
(see
Op.
ID
112-3).
Replacement
of
an
inlet
valve
spring.
Replacement
of
an
exhaust
valve
spring.
To
remove
(see
Pl.
1 and
3).
Remove
the
cylinder
head
cover
(see
paragraphs
15 to
17,
this
operation)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove
the
rubber
gaskets
(2)
and
the
cups
(1)
from
the
sparking
plug
tubes.
Remove
the
rocker
assembly.
Strip
the
shaft:
remove
the
washer
(37),
the
rocker
(36)
or
(38),
and
the
spring
(29).
Fit
the
shaft
(28)
as
a temporary
measure.
Place
the
locking
caps
(52)
in
position
and
tight(en
the
nuts
. . . . . . . . . . . .
Move
the
piston
of the
valve
in
question
to
T. D. C.
Place
the
collar
MR-4244
in
position
on
the
spring
housing
cup
(see
Pl.
17,
fig.
4)
and
compress
the
springs
of the
valve
(spring
compressor
1614-T,
see
Pl.
5).
. . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove
the
split
totters,
the
split
cotter
retaining
cup,
the
upper
spring
bearing
cup
and
the
springs
. . . . . . . . . . . .
1 . Assembly
(see
Pl.
1 and
3).
Make
sure
that
the
thrust
washers
(31)
and
(32)
for
the
springs
are
in
position.
Fit
the
new
springs
and
the
upper
spring
housing
cup.
Compress
the
assembly
(collar
MR-4244
and
spring
compressor
1614-T,
see
Pl.
17,
fig.
4)
and
fit
the
split
cotter
housing
cup
and
the
split
totters
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 mm
box
spanner
Spanner
1603-T
12-17
mm
box
spanners
12-17
mm
box
spanners
Spanner
1603-T
12 mm
box
spanner
12 mm
box
spanner
Collar
MR-4244
Spring
compressor
1614-T
Collar
MR-4244
Spring
compressor
1614-T
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