MG MGB User Manual

THE GEARBOX
F
2.
Bearings
■tted
to
the
first
motion
shaft, third motion
shaft,
and
rear
extension.
Examine
the
bearings
for looseness,
pitting,
security
of
cages,
and
■t
in
their
housings
and
on
their
journals.
Examine
also
the
needle
rollers
in
the ■rst
motion
shaft
and
the
laygear.
Unserviceable bearings
should
be
renewed.
3.
Spring
■tted
to
the
synchromesh hubs,
shaft locating
block,
reverse
shaft, and
reverse
plunger
detent.
Comparisons
may
be
made
with
new
springs,
but
where
facilities
for
test
are
available
refer
to
the
weights
and
lengths
given
under
‘GENERAL
DATA’.
4.
The
rubber
gaiters
for the
clutch
withdrawal
fork and
gear
lever
for
cracks
or
signs
of deterioration.
5.
Ensure
that
all
oilways
are
clear
of
obstruction,
including
the
oil restrictor in
the
front
of the third
motion
shaft.
6.
Examine
the
interlock
arm
for
burrs
and
for
security
of the
rivet.
Section F.9
ASSEMBLING THE
THIRD
MOTION
SHAFT
Lubricate
all
contact
surfaces
with
oil, and
smear
the
bore
of the
gears
with
Duckham’s
Moly
Disulphide
Grease
(max.
size
5
microns).
1.
Use Service
tools
180
222
and
18G
223
to
assemble
the
second
speed
synchromesh hub
and
third and
top
gear
synchromesh hub
respectively.
1
2.
Press
the
rear
bearing into
its
housing
and the bearing
onto
the
shaft.
ADI398
Fig. F.5
Securing
the
mainshaft
gears
A.
Hole
for
spring.
C.
Locating
peg.
B.
Spring.
D.
Locking
washer.
E. Peg
located in
the
washer.
MGB.
Issue4.
1329
A5543W
Fig. F.6
Assembling
a
synchromesh
hub, using
Service
tool 18G
222
3.
Fit
the
speedometer
gear
drive
to
the
shaft with
its
key.
4.
Fit
the
■rst
gear
and
second
gear
synchromesh
to
the
shaft, followed by
the baulk
ring
and
rear
thrust
washer.
5.
Fit
the second speed
gear
bush
to
the
shaft
and
ensure
that the lugs
face
forward and that
the oil hole
in
the
bush
is
in
alignment
with the oil hole
in
the shaft.
6.
Assemble
the second speed
gear
and the
interlock
washer
so
that the washer
engages
the lugs
on
the
bush.
7.
Fit
the third speed
gear
bush, lugs
■rst, and
ensure
that
the
lugs
engage
the
interlock washer and that
the
oil
hole
and
cut-away
in
the
bush
are
in
alignment
with the holes
in
the shaft.
8.
Place
the
retaining pin
spring
and
pin in
the
shaft and
the third
speed
gear on
the
bush with the
cone
facing
forward.
9.
Position
the
gear so
that the hole
in
the
cone
is in
line
with the
retaining
peg,
depress
the
peg
with
a
thin
drift, fit the thrust
washer
to
the
shaft, then
turn
the
washer
to
allow
the
peg
to
lock the
washer
in
position.
Check the
end-■oat of the second and third
speed
gear
(see
‘GENERAL
DATA’ and Fig.
F.4).
Thrust washers
are
available
in
four thicknesses
as
follows:
.1565
to
.1575
in.
(3.96
to
3.98
mm.).
.1585
to
.1595
in.
(4.01
to
4.03
mm.).
.1605
to
.1615 in.
(4.06
to
4.08
mm.).
10.
Assemble the
third
and
fourth speed
gear rear
baulk
ring,
synchromesh, and front
baulk
ring.
Section F
.10
ASSEMBLING THE
GEARBOX
Any
gaskets
or
locking
devices
that
are
unserviceable
or
suspect
should be
renewed during
assembly
of
the gearbox.
1.
Place
the
laygear
in
the bottom
of
the
gearbox
together
with
the
thrust
washers
(see
Section
F.2,
paragraph
16.)
and thread
a
piece
of stiff
wire
through
the laygear
to
allow Service
tool 18G 471
to
R7

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English