Fuel system Section P
Note:
The diaphragm and pull rod plate
are
rivetted together and should not
be
dismantled.
6
Release
circlip and
withdraw
rocker
arm
and
extension spindle from lower body.
7 Remove rocker arm and extension, complete
with
washers and return spring.
8 Check components for wear and renew
where necessary for subsequent reassembly.
Note:
The valve assemblies
are
peened into the
upper body
of
the pump and
are
not replaceable.
Therefore,
if
the valves
are
faulty, or
if
a
replacement part is required but is
not
in the
repair
kit, a new fuel pump
will
have to
be
fitted.
To
reassemble
and
replace
1 Locate rocker arm, complete
with
return
spring and extension in lower pump body.
2
Insert spindle, locate the
two
washers and
secure
with
circlip.
3 Position diaphragm spring on lower body
seating and pull rod key
plate,
if
fitted.
4
Insert the diaphragm pull rod into the rocker
arm extension key and turn through
90° to
lock
in position.
Note:
Ensure the smaller tab on the diaphragm
aligns
with
the mating mark on the lower body
flange.
5 Fit upper
body
ensuring the mark aligns
with
the smaller diaphragm tab, replace
with
five screws and turn them finger tight. Operate
the rocker arm a
few
times to centralise the
diaphragm and tighten the screws securely,
diagonally.
6
Clean the pump mounting face on the
cylinder
block, removing any trace
of
gasket
which
may be adhering to the face, and
fit
a
new
gasket. ·
7 Locate the pump over the fixing studs insert
the rocker arm through aperture in the cylinder
block wall so that the arm lies on the camshaft
eccentric.
8
Secure the fuel pump
with
two
1
5
6
AF nuts
and lockwashers.
9 Remove the plugs and reconnect fuel pump
inlet and outlet pipes.
10
Run
the engine and check for leaks.
Carburettor
Adjust carburettor,
as
necessary, every 3,000
miles (5,000km). The carburettor should also
be removed and cleaned every
6,000 miles
(1
O,OOOkm).
All jets should
be
cleaned in clean
petrol and
blown
out
with
an
air line or tyre
pump.
On
no
account use wire or anything
which
will
enlarge the jet orifices. Clean the
float chamber
with
clean petrol and
blow
out.
To
remove
carburettor
(see
Figure
3)
1 Remove air cleaner.
2 Disconnect fuel inlet pipe from carburettor
and plug to prevent ingress
of
dirt.
3 Disconnect choke control cable.
4 Release throttle lever retaining
nut
tab and
unscrew retaining
nut, complete
with
tab
washer.
5 Unscrew
two
1
5
6
UNF nuts, complete
with
lockwashers, remove throttle return spring
bracket and throttle
lever,
with
cable still
attached.
3
6 Remove carburettor and gasket from inlet
manifold.
To
dismantle
1 Remove five screws and spring washers
retaining the float chamber cover and gasket
to
the lower body.
2 Inside the float chamber cover is the needle
valve
which
controls entry
of
fuel to the
carburettor, and is a screw fit.
3 The hook shaped pump
jet,
which
consists
of
a hexagon base and
an
'0'
ring seal, sits on
the lower body and is easily removed. Adjacent
to
the pump
jet
is the air correction jet, which
has the emulsion tube attached, and
is
a screw
fit. The
slow
running tube,
with
gauze sheath,
can
be
lifted out. ·
Note:
The casting
which
forms the main
discharge assembly can be seen in the throat
of
the carburettor. This is located by means
of
a grub screw,
which
is
locked in position on
assembly.
On
no
account
try
to
remove
or
loosen
this
screw.
4 To gain access
to
the main jet,
lift
out the
plastic
float,
with
its pivot pin and unscrew the
hexagon plug,
with
plain washer, located at the
base
of
the float chamber. Through the plug
aperture, unscrew the main jet
with
a screwdriver
of
suitable size and length.
5 Inspection
of
the pump diaphragm, spring
and passages can
be
achieved by laying the
carburettor on its side
with
the pump
uppermost. Remove the four fixing screws,
while
holding the cover in position. Then
carefully swing away the cover on the operating
rod, taking care
to
release the spring tension
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