CENTRIFUGAL
ADVANCE
MECHANISM
Special
equipment
is
required
to
check
the
advance
characteristics
It
is
possible
however
to
carry
out
an
exam
ination
of
the
caffi
assembly
and
the
weights
and
springs
to
ensure
that
the
earn
is
not
seizing
Lift
off
the
distributor
cap
and
turn
the
rotor
anti
clock
wise
When
the
rotor
is
released
is
should
return
to
the
fully
retarded
position
without
sticking
If
it
does
not
return
to
the
fully
retarded
position
it
will
be
necessary
to
check
for
dirt
and
weak
springs
It
should
be
noted
that
any
wear
in
the
mechanism
or
lose
of
spring
tension
will
upset
the
advance
characteristics
and
cause
unsatisfactory
engine
running
performance
over
the
speed
range
VACUUM
ADVANCE
MECHANISM
The
diaphragm
of
the
vacuum
advance
mechanism
is
mechanically
connected
to
the
contact
breaker
plate
The
rise
and
fall
of
inlet
manifold
depression
causes
the
diaphragm
to
move
the
contact
breaker
plate
to
advance
or
retard
the
ignition
If
the
vacuum
control
unit
fails
to
function
correctly
a
check
can
be
carried
out
to
ensure
that
the
contact
breaker
plate
is
moving
freely
and
that
the
three
steel
balls
at
the
top
and
oottom
of
the
plate
are
adequately
lubricated
Also
make
sure
that
the
vacuum
inlet
pipe
is
not
blocked
or
leaking
and
is
securely
tightened
Leakage
may
be
due
to
a
defective
diaphragm
which
should
be
renewed
along
with
any
other
faulty
part
of
the
mechanism
IGNITION
DlSTRffiUTOR
Removal
and
Dismantling
Disconnect
the
battery
leads
2
Disconnect
the
high
tension
lead
at
the
coil
3
Withdraw
the
high
tension
leads
from
the
distributor
cap
4
Detach
the
suction
pipe
from
the
vacuum
control
unit
5
Mark
the
position
of
the
distributor
and
rotor
remove
the
flange
mounting
bolts
and
withdraw
the
distributor
To
dismantle
the
distributor
proceed
as
follows
Take
off
the
distributor
cap
and
remove
the
rotor
Slacken
the
two
set
screws
holding
the
contact
breaker
upper
plate
Remove
the
primary
cable
terminals
and
withdraw
the
contact
set
from
the
distributor
Fig
C
S
Remove
the
vacuum
control
unit
c
Remove
the
two
screws
and
lift
out
the
contact
breaker
plate
detach
the
clamp
the
terminal
and
the
lead
To
remove
the
cam
take
out
the
centre
screw
as
shown
in
Fig
e
6
Drive
out
the
drive
pinion
retaining
pin
with
a
drift
and
hammer
Fig
e
and
remove
the
pinion
and
washer
Take
care
not
to
stretch
or
deform
the
governor
springs
when
detaching
them
from
the
weights
IGNITION
DISTRIBUTOR
Assembling
and
Installing
Assembly
is
a
reversal
of
the
dismantling
procedure
Lubricate
the
moving
contact
pivot
and
smear
the
lobes
of
the
cam
with
multi
purpose
grease
If
the
centrifugal
advance
mechanism
has
been
dismantled
the
governor
springs
and
cams
must
be
refitted
as
shown
in
Fig
e
8
The
governor
weight
pin
6
should
be
fitted
into
the
longer
of
the
two
slots
leaving
a
certain
amount
of
clearance
for
the
start
and
end
of
the
centrifugal
advance
movement
When
installing
the
distributor
take
care
to
align
the
body
and
rotor
with
the
marks
made
during
removal
The
rotor
must
be
positioned
in
its
original
location
it
will
turn
slightly
when
the
distributor
is
inserted
and
the
gear
teeth
mesh
Remove
and
replace
the
distributor
if
the
rotor
does
not
point
to
the
align
ment
mark
until
both
distributor
body
and
rotor
are
correctly
aligned
SPARKING
PLUGS
The
sparking
plugs
should
be
inspected
and
cleaned
at
regular
intervals
not
exceeding
every
10
000
km
6000
miles
New
sparking
plugs
should
be
fitted
at
approximately
20
000
km
12
000
miles
Remove
the
plugs
and
check
the
amount
of
electrode
wear
and
type
of
deposits
Brown
to
greyish
tan
deposits
with
slight
electrode
wear
indicate
that
the
plugs
are
satisfactory
and
working
in
the
correct
heat
range
Dry
fluffy
carbon
deposits
are
caused
by
too
rich
a
mixture
dirty
air
cleaner
excessive
idling
or
faulty
ignition
In
this
case
it
is
advisable
to
replace
the
plugs
with
plugs
having
a
higher
heat
range
Oily
wet
black
deposits
are
an
indication
of
oil
in
the
combustion
chambers
through
worn
pistons
and
rings
or
excessive
clearance
between
valve
guides
and
stems
The
engine
should
be
overhauled
and
hotter
plugs
installed
A
white
or
light
grey
centre
electrode
and
bluish
burned
side
electrode
indicates
engine
overheating
incorrect
ignition
timing
loose
plugs
low
fuel
pump
pressure
or
incorrect
grade
of
fuel
Colder
sparking
plugs
should
be
fitted
The
plugs
should
be
cleaned
on
a
blasting
machine
and
tested
Dress
the
electrodes
with
a
small
file
so
that
the
surfaces
of
both
electrodes
are
flat
and
parallel
Adjust
the
spark
plug
gap
to
0
8
0
9
mm
0
031
0
035
in
by
bending
the
earth
electrode
Refit
the
plugs
and
tighten
them
to
a
torque
reading
of
1
5
2
5
kgm
II
15Ib
ft
31