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D
THE
FUEL SYSTEM
Next
unscrew
the dia
phragm
assembly
f
rom
its
trunnion in
the contact breaker.
T
his
is
done by
rotating
the whole
assembly
in
an
anti~clockwise
direction.
Take
care not
to
lose the
brass rollers
fitted
behind
the
diaphragm.
T
he
easiest
method is to
hold
the body in
the k
ft
hand
and
to rotate the
diaphragm.
Now remove the contact breaker
cove
r
by taki
ng
off
the
nut which
holds
it
in
place
on
the terminal,
and
then
undo the last
nut
on the
t
erminal,
w
hich
acts
as
a seatlng
for the
c<>vcr.
Beneath
this will
be
found a
lead
washer
which is squeezed
into
the
thread
o
n
the
terminal.
This
>hould be
c
ut
awav
with a
pocket-knife. allowing the
terminal
to
be
ru>hed
down
a short way so
that
the
tag
o
n
the coil
end
is
free'
o
n
the
terminal.
Remo"e
the 5 llA
screw
holding
the contact
blade
in
position. together with
its spring
washer and
the
contact
blade.
RemO\'C the
two
long
2
BA
screws
holding
the
bakelite
pedestal in
place,
together
with
their
spring
wasters.
Take
o
ff
the contact
breaker assembly, using
great
care to
get
the
coil
end tag ov<'r the terminal
without
damaging
the
coil end.
Push
out the hinge
pin
sideways
and
the
pump
is
completely dismantled,
since
the
rocker
mechanism
is
supplied only as a
complete assembly.
Oo
not
disturb
the
core of
the magnet;
it
can
only
be
loca
ted correctly
with
special
press
tools.
To
rea=mble the ]Ju mp
When
rea~scmbli
ng.
see thm
all
pa rts
are
clean.
T
he
val\'eS (3
and 4) should be
f•tted with
the
smooth
side
down"ards. Care should be
take
n
that
the
valve
retain-
ing
clip in
the
o
utlet
valve
cage (5)
is
correctly located in
its groove.
W
hen
refilling
the
top
and
bottom covers
new
gaskets
should
be used
.
The
contact
brea
ke
r
should
be
assem
bled on
its
pedesta
l
in
such a
manner
that the
rockers
are
free
in
their
mount
ings, wi
thout
appreciable
side-play.
Any
cxccs.h·c side-play
on the
o
uter
rocker will
allow
the
points to
get out
of
line.
while
cxccssi,·e
tightness
will
make
the action of
the
contact
breaker
sluggish. To
obtain
the required
freedom
in cases
of
tightness
it may
be
necessary to
square up the outer
rocker
with a
pair
o
f
thin-nosed
p
liers.
The
hinge
pin
is
case-hardened,
and on
no account
should
ordinary
wire be
osro
as
a
replacement.
AJ,..ays
use
the
correct hardened
pin.
Should
the
spring
contact breaker
blade
be
removed,
it
must
always be
replaced bearing directly against the
bakelite pedestal,
i.e. underneath the
tag.
When
properly
fitted the
blade
should
rest
against the
ledge o
n
the
pedestal while the points
are
separated,
a
nd it
should
not be
sufficiently
stiff
to
prevent
the outer
rocker
from
coming
right
fo
rward
when
t
he poi
nts
arc
in contact.
The
points
should
make contact
when
the
D.6
rocker
is in its
midway
position.
The
simplest way
to
check this is to
hold the
blade in contact
with
the
pedestal,
taking
care not to
press
o
n
the
overhanging portion, and
ascertain that a
·030 in. ('76
mm.)
feeler
can
be
inserted
between the
white
rollers and
the
cast-i
ron
body
o
f
the
pump.
If
necessary, the
tip of
the
blade may be
set
to give
the correct clearance.
NOTE. -The spring washer on the
BA
screw
to wbieb
tbe
ea rth conne<:tion
is made
should
be
fitted
between
the
tag and
the
pedestal.
The spring wasbe.r is
not
a reliable
conductor,
and
the bras.s
tag
'mUSt
bear
directly against
the head of
the
screw.
All
four connections,
namely,
the.
tv.o
ends o
f
the
eanhing
tag and
t
he two
ends of the
coil,
should be
soldered.
The
coil
end leading to t
he terminal
should
be soldered to
its
tag
and not
to the
retaining nut.
I
n
the
case of
the terminal
screw
which
holds the bakelite
cover
in
position similar considerations apply,
the
assembly being
:
spring
washer
( 1),
wiring tag
(2),
lead
washer (3), and
recessed nut
(4)
(see
F
ig. 0
.2). A
lead
washer
has been
fou
nd
necessary
at
this
point as some
few cases of bad connection
have
been
found
.
Under
no circumstances
must
the
s
pring washer be omitted,
or
the
assembly
shortened
in
any
way.
Any
attemp
t
to
do
so
is
likely to lead
to
breakage
o
f
the
pedestal
when
the nut
reTaining
the
cover
io
pos
ition
is
tigh
tened
up.
Fig.
D .2
The
correct
sequence
of
assembly of rhe connecting
components
on
the
terminal
screw
The
armature return
spring should be
fitted with
its
larger
d
ia
meter
towards
the
co
il
and its
smaller d iameter
resting
against
the
armature.
T
his
spring
must
not
be
stretched
or
otherwise
interfered with,
or
the
action
of
the
pump
will
be affected.
Section
D.6
RESET
riNG THE DIAPHRAGM
FOR
CONTACT
BREAKER
'THROW·OVER'
If the
armature
a nd
centre
rod
have
been unscrewed
it will be
necessary
to
reset as
follows:
(I)
S"
ing
to one
side the spring
blade ..-hieb
carries
the
contact points.
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