bW'ofkshop
Manual
flo//s Royce Silver
Shadow
8
Bentley
T
Series
points are closed. Check that when the contact points
of the fuel system are kept clear of the body frame
'make' or 'break' one pair of points wipes over the
between the insulated mounting clips. Also ensure that
centre line of the other in a symmetrical manner. The
the two breather pipes are firmly attached to their
contact blade is slotted to provide some degree of
nipples.
adjustment.
22. To set up the contact gap proceed as follows.
Ensure that when the outer rocker is pressed onto
the solenoid housing, the contact blade rests on the
narrow ridge which projects slightly above the main
face of the pedestal. This is achieved by slackening the
contact blade attachment screw, swinging the blade
clear of the pedestal, and bending it downward a
sufficient amount so that when repositioned it rests
lightly against the ridge. Over-tensioning of the blade
will restrict the travel of the rocker mechanism.
23. Check the lift of the contact blade top above the
top of the pedestal with a feeler gauge. If necessary,
bend the stop finger beneath the pedestal to obtain a
gap of between 0.030 in. and
0.040 in. (0,76 mm. and
1.02
mm.).
24. Tighten the contact blade attachment screw when
the correct setting has been obtained.
25. Ensure that the end cover seal washer is in posi-
tion on the terminal stud. Fit the bakelite end cover
and secure it in position with the lock washer and
brass nut.
Test data
1.
When both fuel pumps are operating they should
deliver
1.333 pints (0,758 litres) of paraffin in 28
seconds at a delivery head of 4 ft.
(1,22 m.) and a
suction lift of 10 in.
(25,4 cm.).
2.
Mount the pump unit on
a
test rig 10 in. (25,4
cm.) above
a
paraffin bath. Fit
.i$
in. (7,94 mm.)
diameter bore pipes to both the inlet and outlet unions
of the pump; immerse the pipe connected to the inlet
union in the paraffin bath and suspend the pipe con-
nected to the outlet union 4 ft.
(1,22 m.) above the
pump unit.
A measuring jar or receptacle of known
capacity should be placed beneath the outlet union,
and the delivery of the pump checked against a stop-
watch.
3. Operate each pump independently at
13.5 volts;
each pump should deliver
1.333 pints (0,758 litres) of
paraffin in
56
seconds. Partly block the outlets of the
pumps, reducing the flow to
1
pint (0,568 litres) of
paraffin in 8 minutes when both pumps are operating;
check the operation of the pumps and should buzzing
occur, they should be rejected.
Fuel pump-TO
fit
4. Buzzing occurs when the pumps are operating
quickly but without doing any work, resulting from
To fit the fuel Pump, reverse the procedure given for
the sponge of the diaphragm being equal to the stroke
its removal noting the following points.
of the pump.
1.
In order to prevent excessive transmission of
5.
A faulty pump unit should either have a new
noise from the pumps,
it
is essential to ensure that
diaphragm fitted or be exchanged for a reconditioned
when fitting the fuel pump, the delivery and feed pipes
unit (see Reconditioned
fuel pump
units).
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