Fig.
10.
(1) Upper jet bearing.
(2) Main jet.
(3)
Cork gland washer.
(4) Fuel Passage.
(5)
Gland washer.
(6)
Brass sealing ring.
(7) Jet head.
(8)
Nut cap.
(9)
Jet adjusting screw.
(10) Fibre washer.
(1 1) Jet lower bearing.
(12) Set screw.
(13)
Cork sealing ring.
(14) Gland spring.
('i
5)
Copper plug.
(16)
Float chamber body.
(17) Copper washer.
The model
'541'
has three S.U. carburetters, with a smal! electrically operated
carburetter for starting. This starting carburetter which
is
operated by a switch
on the facia panel marked
'C,'
supplies a rich mixture to the cylinders for easystarting.
This starting carburetter must be switched off as soon as possible after the motor
has warmed up.
The carburetters are carefully synchronised to ensure perfect running for the
engine and
it
is,
therefore, very important that the throttle linkage between the
carburetters is not interfered with in any way. The carburetters will also give the
best results if adjustments are only made when absolutely necessary.
Maintenance.
The only attention normally required
is
the monthly application of a few spots
of thin machine oil to each carburetter suction chamber oil cap.
This will ensure
that the taper needle and piston assembly are free to respond readily to changes in
engine speed.
The filter in the inlet unions to each carburetter should be cleaned occasionally.
Unscrew the unions, lift off the filter, rinse in clean fuel and replace.
Ensure that
the two fibre washers are in position on each side of the union.
If the running of the engine
is
poor, always make sure that the trouble does not
lie elsewhere than the carburetters.
Check the spark plugs and distributor contact
breaker points and see that the tappets are correctly set.
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