Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 115 / 413

WSM.114
Section C (Fuel System)
The carburettor is now dismantled sufficiently for
cleaning. There is no need to remove the high
speed bleed and this cannot be done without
damaging it.
INSPECTION AND CLEANING
A list of Jet sizes and other specifications for the
carburettor is given in the "Data" section at the
beginning of this manual.
Check that all jets and orifices are clean and un­
damaged. When cleaning do not pass a wire or any
similar hard material through the jet orifice. These
orifices are carefully calibrated and the slightest
alterations of size will affect the flow through them.
If a change of jet size is necessary, obtain a new Jet
from the makers. Do not attempt to ream or
otherwise tamper with the old one.
Inspect all valve seats and ensure that they are
perfectly clean and free from foreign matter. All
parts should be washed with clean fuel and all
passage-ways in the carburettor bodies should be
blown through with CLEAN compressed air. An
exploded view of the carburettor Is shown in
Fig. 18 and the names of the various parts given on
the adjoining page.
Reassembly
This Is of course a reversal of the dismantling pro­
cedure. Close attention should be given to the
following polnts:-
1. The top cover gasket should be renewed to
ensure that no air leaks into the slow running
passage-ways.
2. Joints on each side of the by-pass valve operat­
ing diaphragm should also be renewed.
3. On WIA carburettors, diaphragm spring must
seat squarely in the metal cup on the top of the
diaphragm when replacing the cover.
4. The small gasket below the accelerator pump
discharge nozzle should be renewed.
5. The synthetic rubber ring fitted In the groove
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Page 29
around the metering jet just above Its hexagon
head, must be In good condition.
6. The accelerator pump delivery valve ball must
be replaced · before inserting the discharge
nozzle screw.
THIS BALL MUST NOT BE TAPPED ON OT
ITS SEATING.
If this Is done, it may Jam into the hole immedi­
ately below its seating.
7. A little jointing compound should be used on
the heat Insulator faces when refitting the
throttle body to the main carburettor body.
AIR INTAKE SILENCERS-Alpine
The removable air intakes can become partly
blocked with dust which may eventually restrict
the air flow enough to reduce top end performance
or Increase fuel consumption.
These gauzes should be occasionally removed and
cleaned by washing in paraffin (kerosene). After
cleaning they should be blown dry with compressed
air, or alternatively allowed to drain dry.
OIL BATH AIR CLEANER AND
SILENCER-Rapier
The intervals at which the oil bath air cleaner needs
to be serviced will vary according to the conditions
under which the car is operating.
For town work or areas where the roads are
relatively dust free, every 3,000 miles (4,800 km.)
can be taken as a guide, although In territories
where the roads are bad and dust is prevalent,
servicing should be carried out more frequently;
To clean and re-oil Air Cleaner
1. Slacken clip on hose connecting top of air box
to air cleaner.
2. Undo the thumb screw In centre of air cleaner
and lift off cover. Remove oil bath container.
(Continued on pac• 32)