S.U.
Carburerrer
I
FLOODING FROM FLOAT CHAMBER OR
MOUTH
OF JET
Flooding may occur due to a punctured float, or to dirt between the float chamber
needle valve and its seating. To remedy either defect, the float chamber lid should
be removed and the necessary cleaning, float replacement or repair effected. The
needle and seating unit number
is
T2, to identify which two ring grooves are machined
around the seating.
Flooding may also occur if the original manufacturer's setting of the hinged fork lever
(11)
in the top of the float chamber has been disturbed, possibly causing the petrol
level to be higher than noimal, this higher level giving a slow petrol bleed over the
jet bridge. The setting figure for this fork
is
that with the fork pressing the needle
home on
its
seating, a (9.5 mm.) diameter test bar should just slide easily between
the curve of the fork and the circular facing of the float lid casting.
Flooding may also be caused by
a
bad seal between the float needle and its seating.
and which may sometimes be restored by giving the needle a few light taps wyth a
delicate instrument such
as
the handle of a screwdriver.:
ROUGH HANDLING WILL RENDER THE PARTS SCRAP.
Leakage from bottom of Jet
If persistent slow leakage
is
observed in the neighbourhood of the jet head,
it
is
probable that the jet gland washer
(7)
and
its
lower counterpart, together with the
locking screw washer (19) require replacement. The jet lever
(23)
should
first
be
detached from the jet head, the locking screw
(15)
removed, and the entire jet and
jet bush ass~mbly withdrawn.
On re-assembly, great care should
be taken to
replace all parts in their correct situations, as shown in the diagram. Re-centring
of the jet, as previously described, will of course be necessary after this operation.
HINTS AND TIPS
I
L
These are
a
few of the points to which the Owner should pay particular attention in
order
to
maintain minimum fuel consumption and maximum power.
1.
The Float Chamber.
If rough running and poor idling are suddenly ex-
perienced, the internal float chamber condition
is
usually responsible. To overcome
this trouble remove the float chamber every two months and thoroug,hly cleali.
When replacing, do not overtighten the lid sleeve nut
as
this will cause distortion
and leakage of fuel
at
the joint between lid and float chamber.
2.
Air
Leaks.
Leakage
at
the manifold to engine and carburetter to manifold
will completely upse: the smooth performance of the engine.
3.
Sticking Piston.
Dirt, corrosion or
malalignment of the
jet
will cause the
piston to stick. Make sure that :he suction chamber wd pi~on are perfectly
dry
and clean, and that the PISTON ROD, which must move freely in
its
bush. IS OILED.
Before attempting to re-centre the jet try the effect of turning
it
through
180'.
11
may have been replaced in the opposite position, in the mixture lever.
4.
Throttle Spindle.
Overstressing the throttle spindle torsion return spring
is
J.
common fault. This causes the coils to bind before fuil throttle
is
attained, and
disturb the whole mechanism. Incorrect ~ositioning of the moiable throttle le\er
may do the same.
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