Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 109 / 413

WSM. 124
Section C (Fuel System)
sticking in the closed position, due to formation of
gummy deposit from petrol or additives.
See that both strangler flaps in the air intakes close
completely when the choke (strangler) control is
operated. From examination of the strangler
control on the carburettor it will be seen that
there Is no mechanical connection between the
choke cable and the spindle on which the strangler
flap is fitted. Movement of a cam lever on the side
of the air intake permits the spring loading of the
strangler spindle arm to close the flap in the air
intake. Therfore, undue friction by reason of
bent strangler spindle, binding bearings or a broken
spring could explain non-closure of the flap In the
intake. Removal of the air cleaner connection will
enable this to be checked, or alternatively the
strangler valve movement can be checked by pulling
the choke control fully ou.t and operating the
strangler spindle lever by hand. The correct
position for the strangler spindle lever, when the
choke is pulled fully out, Is shown In Fig. 8.
Check that the throttle opens when the strangler
valve is fully closed. This amount of throttle open­
ing Is very important and must agree with the
measurement given in the Data Section under
Carburettor, Fast idle. The correct method of
making this adjustment is given under ADJUST­
MENTS.
The choke control should not move back after
being pulled out. When correctly fitted the choke
control should hold the strangler valves closed
when it is pulled fully out, and released. It should
also enable a fast idle speed to be held when moved
out a short distance and released. If the choke
control cable Is too free In operation, so that it
falls or creeps back when released, it can be
stiffened up by slightly bending the inner cable
to give more Internal stiffness.
Difficult starting when hot
This Is caused by a rich mixture produced by flood­
ing of the carburettor or incorrect use of the
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strangler. Any fuel that runs into the Inlet manifold
should drain away through the inlet manifold drain
pipe and a check should be made to see that this
pipe and its ball valve end are clear.
Provided the carburettor Is not constantly flooding,
the engine can usually be started after gently
opening the throttle to Its fully open position and
rotating the engine on the starter with the ignition
switched on.
ADJUSTMENTS
The only adjustments that may need attention in
service are:-
(a) Synchronisation of throttles and slow running
adjustment.
(b) Throttle, fast idling for starting.
(c) Accelerator pump stroke.
(d) Fuel level.
(e) Choke control.
Synchronisation of throttles and slow running
adjustment (See Fig. 15)
Correct idling of the engine, and proper perfor­
mance at small throttle openings are ensured by
synchronisation of the two carburettors. These
adjustments are made in the following order but
it is emphasised that correct adjustment cannot
be made if air leaks exist In the induction system
or if the ignition is Incorrectly timed, or not
functioning properly.
1. Loosen the clamp bolt (3) to allow independent
movement of each throttle.
2. Unscrew throttle stop screws (2) until both
throttles are in the fully closed condition, and
the screw ends clear of their abutments.
3. Holding the throttles in the shut position
tighten the coupling clamp bolt (3).