Rolls-Royce Corniche - Page 87

Rolls-Royce Silver Shadow B Bentley T Series
Workshop Manual
Chapter K
ACTION
To rectify the fault, ensure that
all connections from the fuel
tank to the pump are in good
condition, also check that the
inlet union is tight.
Check that
the solenoid housing securing
screws are firmly and evenly
t~ghtened. Air leaks on the suc-
tion side of the pump cause
rapid operation and are the
most frequent cause of pre-
mature failure.
(b) Renew mounting rubbers.
(c) Alter position of pipe as
neces-
sary to obviate foul.
7. (a) Remove the air cleaner hosing
from the butterfly housing.
A spring-loaded pin, located on
the right-hand side of the suction
chamber, is provided for lifting
the piston
(see Fig. K12 item 35).
Normally, when the engine is
not running, the piston rests on
the buffer pin in the base of the
piston just above the bridge of
the main carburetter body.
Raise the piston to its highest
position, against the resistance
of the damper piston, then re-
lease it and check that it drops
freely. If the downward move-
ment of the piston is sluggish or
if the piston does not readily
leave the bridge of the
carburet-
ter, lower the main jet by push-
ing the mixture adjusting screw
lever upwards and repeat the
check on the piston.
The elimination of sticking by
lowering the jet indicates that
the needle is fouling the jet.
First check for a bent needle;
if the needle is satisfactory, it
will be necessary to
centralise
the jet (Carburetters with fixed
needles only).
After lowering the jet, if the
piston continues to stick it is
probable that the piston is
fouling the side of the suction
chamber or that the piston rod
is not free to move within its
bush (refer to Action
7 (b)).
On completion of these checks
reset the carburetters
(see Sec-
tion
K4-The Carburetters and
Autonutic Choke System-Car-
buretter Tuning).
SYMPTOM
he1 Pumps-continued
Carburetters
7. Stalling, poor slow running,
lack of power and high fuel
consumption.
POSSIBLE CAUSE
(b) Hard mounting rubbers.
(c) Fuel pipe fouling body.
7. (a) Sticking carburetter piston
caused by the needle fouling the
jet.