MG MGB User Manual

D
THE FUEL SYSTEM
Section
D.1
LUBRICATION
Carburetters
Unscrew the oil
cap
at
the
top
of
each
suction
chamber,
top
up
with oil
to
within 1/5
in.
(13
mm.) from
the
top
of
the
hollow
piston
rod. Under
no
circumstances
should
a
heavy-bodied
lubricant
be
used.
Failure
to
lubricate
the
piston
dampers will
cause
the
pistons
to
flutter
and reduce
acceleration.
Section
D.2
FUEL
TANK
Removing
EARLY TOURER
MODELS
(10
gal.
(12
US. gal., 45.4
litres))
Disconnect
the
battery and
raise
the
car
to
a
workable
height.
Remove the
hexagon
drain plug and
empty
the tank.
Slacken the
two
clips
on
the filler
neck hose,
withdraw the
filler
extension
and
seal.
Disconnect
the fuel
pipe
at
the
union
and the fuel
gauge
cable from
the
tank
unit,
each
on
the
right-hand side of
the
tank.
Support
the tank
and
remove
the
two nuts
from the
bolts
securing
the
straps at
the
rear
of
the tank
to
the
anchorage
brackets.
Swing
away
the
straps
and lower
the tank.
LATER
TOURER
AND GT
MODELS
(12
gal.
(14
U.S.
gal.,
54.5
litres».
Disconnect
the
battery
and
raise
the
car
to
a
workable
height.
Remove
the
hexagon
drain
plug
and
empty
the
tank.
Slacken
the
two
clips
on
the
filler
neck
hose,
withdraw
the
filler
extension
and
seal.
Disconnect
the fuel
pipe
at
the
union
and the
fuel
gauge
cable from
the
tank
unit,
each
on
the
right-hand
side of
the
tank.
Support
the
tank
and from
inside the
luggage
compartment
remove
the
set
screws
securing
the
tank
to
the luggage
compartment
■oor.
Lower the
tank.
Replacement
is
a
reversal of
the
above
instructions.
Fuel
gauge
tank
unit
EARLY
TOURER
MODELS
Remove
the
six
set
screws
securing the
unit
to
the
tank
and
withdraw
the
tank
unit, taking
care
not
to
strain
or
bend
the ■oat
lever.
When
replacing,
a
new
joint
washer
must
be
~
■tted
and
a
sealing
compound
used
to
make
a
fuel-tight
Joint.
LATER
TOURER
AND
GT
MODELS
Remove the
tank
gauge
locking
ring
with
Service tool
18C
1001 and
lift
out
the
gauge
assembly
and
rubber sealing
ring.
When
re■tting
the
gauge
unit
a new
rubber sealing
ring
‘
should
be ■tted
if
necessary
to
ensure
a
fuel-tight
joint.
‘
-_
.D.2
Section
D.3
FUEL PUMP
Removing
and refitting
The
fuel
pump
is
mounted
on
a
bracket
secured
to
the
heelboard adjacent
to
the front
mounting
right-hand
rear
spring,
and
is
accessible from
beneath the
car.
Disconnect the earth lead from the
batteries
and
the
earth
and supply leads
from
the
terminals
on
the
pump.
Disconnect the
inlet and outlet
pipe
unions
and the
breather
pipes
(later cars).
Remove the
two
bolts
securing
the
pump
bracket
to
the
heelboard.
When refitting,
reverse
the
removing
procedure
ensuring
that the breather
pipes
are
connected
to
the
pump
and
correctly
retained by
the ‘T’
pieces
in
the
harness
grommets
in
the
boot
■oor.
'
Dismantling
CONTACT BREAKER
1.
Remove the
insulated sleeve
or
knob,
terminal
nut,
and
connector,
together with
its
shakeproof
washer.
Remove the
tape
seal and take off
the end
cover.
2. Unscrew the
5 BA.
screw
which
holds the
contact
blade
to
the pedestal
and
remove
the condenser from
its
clip. This
will allow the
washer,
the long coil lead,
and the
contact
blade
to
be removed.
COIL
HOUSING
AND DIAPHRAGM
3.
Unscrew
the coil housing
securing
screws,
using
a
thick-bladed
screwdriver
to
avoid
damaging
the
screw
heads.
4. Remove the
earthing
screw.
5. ROLLER TYPE.
Hold the coil
housing
over
a
bench
or
receptacle
to
prevent
the
11
brass
rollers
from
being damaged
or
lost
as
they
come
free,
unscrew
the
diaphragm
assembly
anti-clockwise
until the
armature
spring
pushes
it
free
of the
housing.
GUIDE
PLATE
TYPE.
Turn the
back
edge
of
the
diaphragm
and carefully
lever the
two
end lobes of
the
armature
guide
plate from
the
recess
in
the coil
housing,
unscrew
the
diaphragm
assembly
anti-clockwise
until the
armggre
spring pushes
it
free
of
the housing.
Remove
the
armature
guide from
the
diaphragm
assembly.
PEDESTAL
AND ROCKER
6.
Remove
the
end
cover
seal
washer,
unscrew
the
terminal
nut,
and
remove
the lead
washer. This
will
have ■attened
on
the
terminal
tag
and
thread
and is
best
cut
away
with
cutting
pliers
or
a
knife.
Remove
the
terminal
tag
spring
washer.
Unscrew the
two
2
DA.
screws
holding
the
pedestal
to
the coil housing,
remove
the
earth
terminal
tag
together
with the
condenser
clip.
Tip the
pedestal and
withdraw
the
terminal
stud from
the
terminal
tag.
The pedestal
may
now
be
removed
with
the
rocker
mechanism
attached.
MGB. lssue8.
91427

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English