Rolls- Royce Silver Shadow
&
Bentley
T
Series
Workshop Manual
0
Chapter
K
ACTION
(b)
Remove the float chamber lid,
then withdraw the float.
Thoroughly clean the float
chamber and the wire mesh
fitter in the lid (if paper filter is
fitted it should
be
renewed).
If dirt is present in the float
chamber, it is possible that the
main jet may be choked.
The following method should
successfully clear a choked jet.
(i) Remove the suction cham-
ber and withdraw the piston
assembly.
(ii) Fit the suction chamber and
seal the air intake.
(iii) Disconnect the
L.T.
lead
on the distributor then re-
move the protective cap
from the starter solenoid.
(iv) Lower the jet to its bottom
position by pushing the
mixture adjusting screw
lever upward, hold it in this
position.
(v) Operate the starter motor.
This should cause any
foreign matter to be drawn
out of the jet into the
carburetter body.
(vi) Should this fail to clear the
blockage, remove and clean
the jet, bearing in mind that
all carburetter parts should
be assembled in the same
relative position from which
they are removed
(see Sec-
tion
K4).
If globules of water are found in
the carburetter, the fuel system
should
be
cleaned thoroughly
and the fuel tank drained in
order to inspect the fuel for
water content.
On completion of this operation,
tune the
carburetters
(see Sec-
tion
K4).
9.
(a) Remove the float chamber lid
and withdraw the needle valve,
then clean the valve and
its
seat-
ing with a clean cloth soaked in
alcohol. Cleaning of the seat
will be facilitated by wrapping
the cloth around a thin wooden
stick. Repeated trouble of this
nature can only
be
rectified by
completely dismantling and tho-
roughly cleaning the fuel system
and tank.
10.
(a)
Check
the fuel pumps for ade-
quate delivery and the filters in
the system for cleanliness.
SYMPTOM
Carburetters-continued
9.
Engine
stalls
when idling or
under light
running conditions.
10.
Engine
shows
serious
loss
evident at high
s&rti
loading.
POSSIBLE
CAUSE
(b) Water or foreign matter in the
float chamber.
9.
(a) Providing that there is a good
supply of fuel available at the
float chamber inlet unions, it is
possible that the float needle
valve has stuck to its seating.
This results from a
gum
deposit
which
fonns in the fuel system
after prolonged storage of the
fuel in the tank.
10.
(a) Insufficient delivuy of fuel.
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