MG MGB User Manual

A
THE ENGINE
Removing
the
power
unit
ALL
MODELS
Disconnect
the
batteries.
Remove
the
bonnet—Section
R.9.
Drain
the
oil
from the
engine
and gearbox.
Drain
the
coolant from
the
engine
and
radiator.
Disconnect the
oil cooler
and oil
pressure gauge
pipes
from
the
engine.
Disconnect
the
top
and bottom
radiator
hoses from
the
engine.
Remove the
oil cooler
securing
bolts.
8.
Rem
ove
the radiator
and diaphragm
assembly—Section C.6~complete with
oil
cooler
and
pipes.
9.
Disconnect
the
wiring
from
the dynamo
or
alternator
and
the
distributor.
10.
Detach
the
leads from the sparking plugs
and
remove
the distributor
cap.
11.
Disconnect
the heater
hoses and control cable.
12.
Disconnect the thermometer thermal
transmitter
from
the
engine.
13.
Disconnect the
wiring
from the
starter.
14. Disconnect the
petrol
pipe
and choke cable and
remove
the
air
cleaners from the
carburetters.
15
.
Disconnect the tachometer (if
drive
type).
mewwr
9‘
>‘
SYNCHROMESH GEARBOX
AND
OVERDRIVE
16. Remove
the
gear
lever
surround,
raise
the
rubber
boot,
unscrew
and
remove
the lever
retaining
bolts.
Remove
the
gear
lever.
17.
Disconnect the
wiring
from
the
reverse
light
and
overdrive isolation switches.
18.
Detach
the clutch slave
cylinder from
the
gearbox
casing
and
move
it
clear
of the
assembly.
AUTOMATIC GEARBOX
19.
Disconnect the down-shift
cable from
the
carburetters.
20. Disconnect the
manual control lever from
the
gearbox
shaft.
21. Disconnect the
wiring
from the
inhibitor
and
reverse
light
switch.
ALL MODELS
22.
Disconnect
the
speedometer
cable from
the
gearbox.
23.
Take
the
weight of the
engine
on
a crane
and
support
the
gearbox.
24. Disconnect
the exhaust
pipe
from
the manifold
and
release
the
pipe
clip from the
gearbox.
25. Disconnect and
remove
the
propeller shaft—Section
G.2.
26. Remove
the
bolts
securing
the
engine
front
mountings
to
the frame.
EARLY
CARS
27.
Remove the bolts
securing
the
rear
cross-member
to
the
chassis
frame
and allow the
gearbox
to
rest
on
the
■xed
cross-member.
28. Remove
the
stay
rod
from
the
gearbox.
A.26
L;
29. Unscrew
the
bolts
securing
the
rear
mountings
to
the
gearbox
and
remove
the
cross-member
complete
with
stay-rod.
LATER
CARS
30. Remove
the four
bolts
securing
the
cross-member
to
the
chassis
frame.
31. Remove
the
two
bolts
securing
the
bottom
tie
bracket
to
the
cross-member.
32. Lower the
gearbox
so
that
it
rests
on
the ■xed
cross—member,
remove
the
rear
mounting
securing
nuts
and
remove
the
cross—member.
ALL
MODELS
33.
Ease
the
assembly forward
until the
gearbox
is
clear
of
the
cross-member,
tilt the
assembly
and lift from
the
car.
34. Remove the
gearbox from
the
engine
as
described
in
Section
F.1,
Section Fb.1,
or
Section Fd.10.
Re■tting
the
engine
35.
Reverse the
removing
procedure,
re■ll
the
engine and
gearbox with
a
recommended
lubricant,
and re■ll
the
cooling
system
with
coolant.
Section
A.22
ENGINE
CONTROLS
The
engine controls
comprise
the
accelerator
pedal
and
the
choke
control. The
accelerator
pedal
assembly
pivots about
a
bush
and
distance
piece
that
is supported by
a
bracket
at
the
top
of
the
pedal
box.
An accelerator
pedal
stop
is
bolted
on
the
front
of the
pedal
box
and
a
pedal
return
stop
on
the
pedal
lever abuts
a
return
stop
screw
in
the
top
of
the
pedal box.
The
upper
end of
the lever
is
slotted
to
accommodate
a
nipple
on
the
inner end
of
the
accelerator
inner
cable.
The
cable
passes
through
a
guide bolted
to
the
bulkhead,
through
an
outer
cable,
and
then
through
a
guide
on
the
top
of the
heat
shield.
The
outer
end of
the
cable.
is
clamped
to
a
pin
attached
to
the
spindle
and lever
assembly
that
operates
the
throttles.
The
outer
cable
ends
abut the
bulkhead
guide and the
heat
shield
guide.
One
end of
an
accelerator
return
spring is
attached
to
the
spindle
and lever
assembly
and
the other
end
to
a
clip
at
the
bottom of
the heat shield.
The
choke
control
is
mounted
on
the fascia
adjacent
to
the
ignition/
starter
switch
and
comprises
a
knob,
inner
cable,
and
outer
cable
assembly. The
cables
pass
through
a
rubber
grommet
in
the
bulkhead.
The end of the
inner
cable
is
clamped
to
a
choke
control
bracket secured
to
the front
carburetter ■ange
by the
air
cleaner
securing
bolts. The
outer
cable
terminates
in
an
abutment that
is
pinned
to
the
carburetter choke
operating
lever.
When the
control
is
operated the
inner cable length
is
reduced
between
the
bulkhead
guide and
clamp
pin.
The
outer
cable therefore
moves
along the
inner
cable and
operates
the
choke
lever.
MGB.
Issues. 15676

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English