MG MGB User Manual

Fl)
THE GEARBOX
(ALL
SYNCHROMESH)
Section
Fb.9
LAYGEAR
Removing
1.
Remove the
rear
extension—Section Fb.2,
1
to
5.
2.
Remove the front
cover—Section Fb.3,
1
to
3.
3.
Remove the selector
rods and forks—Section
Fb.4,
2
to
5.
4.
Remove the
reverse
idler
gear—Section Fb.5,
2
to
4.
5.
Remove the ■rst
motion
shaft—Section
Fb.6,
5
to
7.
6. Remove the third
motion
shaft—Section
Fb.7,
6
to
9.
7. Temporarily refit the layshaft
and check
the laygear
end-■oat.
8. Withdraw the layshaft
and
remove
the laygear
and
its
thrust washers.
Dismantling
9.
Withdraw
the needle-roller
bearings from
inside the
laygear.
Inspection
10. Inspect
the
layshaft for
wear
and
damage
to
the
bearing surfaces.
11.
Examine
the roller
bearings for
wear
and
damage.
12.
Inspect the laygear
teeth for
damage and the
bearing
faces
and bore for
wear.
Reassembling
13.
Fit the
needle-roller
bearings
into
the laygear.
Refitting
14.
Position
the
laygear
and
front (large)
thrust
washer;
enter
the layshaft
through the
housing
and thrust
washer,
and
into
the
laygear.
15.
If
the laygear end-float
measured
in 7
is
outside the
limits
given,
select
a rear
thrust
washer
to
give
the
correct
end-■oat.
Fb.8
16.
17.
18.
19.
20.
21.
22.
Fig.
Fb.1
5
Using
tool
18G
391
to
unscrew
the
rear
nut
on
the
overdrive
gearbox third
motion shaft
Rear thrust
thicknesses:
.154
to
.156
in.
(3.91
to
3.96
mm.)
.157
to
.158
in.
(3.99
to
4.01
mm.)
.160
to
.161
in.
(4.06
to
4.08
mm.)
.163
to
.164
in.
(4.14
to
4.16
mm.)
Fit
the
rear
thrust washer
and thread
a
piece
of soft
wire
through
the
housing,
thrust
washer,
and
into
the
laygear.
Withdraw
the
layshaft,
at
the
same
time
thread
the
wire
through
the laygear
and front thrust
washer.
This
will enable
the
laygear
and thrust
washers
to
be
retained
ready for refitting
the layshaft,
and
at
the
same
time
allow
suf■cient
movement
of the
laygear
to
prevent
the
gear
teeth
obstructing
the
gears
on
the
first
and
third
motion
shafts
during re■tting.
Re■t the
third
motion
shaft—Section
Fb.7,
35
to
37.
Refit
the ■rst
motion
shaft—Section
Fb.6,
16.
Use the
wire
to
align
the
laygear
and thrust
washers.
Enter
the layshaft,
plain
end
■rst,
into
the
front
of
the
casing;
line
up
the
cut-away
in
the
end of the shaft
with
the front
cover
recess
and
press
the
shaft
home.
Reverse the
removing procedure
in 1
to
4.
washers
are
available
in
the following
MGB.
Issue2. 22802

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English