52
Tur
'R'
Tvpr BeNrrBY.
Float
Feed
Mechanisms.
These
are
of
the usual
"top
feed"
pattern,
whereby,
as
the level
of
the
petrol
rises in the
float chamber, a
lever bearing
on the
top
of
the
float
moves
the conical seat
"needle"
upwards
on to its
seating,
so shutting off
the supply.
If
it
is
required to dismantle
the
float chambers, it will
be
more
convenient
to remove
them bodily-after disconnecting
the fuel
pipes,
and the small air
bleed
pipe
to the
cover-by unscrewing
the hexagon
plugs
which secure
each to
their respective carburetter
bodies.
When
the
covers are
removed,
care must
be taken that
the fulcrum
pins
of the
levers
do
not fall out.
They
are normally
retained by
means
of the walls of the
float chambers.
The
chambers should
be
wiped out with
a
piece
of clean wash-
leather before being
refitted.
When
replacing
them,
care must
be
taken
to
see that
the
packing
washers
are in
position,
one
above and
one
below the
boss
which couples each
to
the
carburetter
body.
Furthen Dismantling of
Garbunetter.
It should
never be
necessary
to remove
any other
parts
of
the
carburetter
than
those referred
to in
the foregoing pages.
The
jet
assembly securing nut should not be
disturbed,
as the
refitting
of this requires special tools to
ensure
that the
jet
is
accurately
centralised
relative
to
the
taper
needle valve.
Adiustment of
Gontrols.
There
should be
no necessity for any variation of the
adjustments
as
fixed
by the
makers.
Great care is taken during
the
testing of the
car
to
secure
the best settings, and these should not under normal
circumstances
be altered.
There
are certain
external adjustments,
however,
which are dealt
with in
the following
paragraph.
Setting of
ldling
Adjustments.
r.
Jhe
quantity
of mixture for
slow
running
is determined by
means
of an adjustable screw
on the
front
carburetter
(5,
Fig.
13)
which
limits the closing
movement of the s5rnchronised
throttles.
The
strength
or
quality
of the
mixture
for slow
running
is set
by means
of an adjustable
screw
in
the base of each
carburetter
(11,
Fig.
14).
The screw
operates
to
raise
or
lower
the
jet.
Raising
the
jet
causes the taper
needle
to sink
farther
into the
orifice,
so
weakening the
mixture.
Conversely,
lowering
the
jet
enriches
the
mixture.
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