MG MGB User Manual

THE
AUTOMATIC
GEARBOX
Pd
18.
Stop,
and
with ‘Ll’
selected
use
full throttle
to
accelerate
up
to
35
m.p.h.
(56
km.p.h.).
Check
for
no
up-shift,
clutch slip
and
squawk.
19.
Stop,
select
‘R’,
reverse
using
full
throttle if possible;
Check for
no
slip
or
clutch
squawk.
20.
Stop
facing
downhill
on a
gradient
and
select ‘P’,
release
the brakes
and
check that
the parking
pawl
holds the
car;
re-apply the brakes
before
dis-engaging
the parking
pawl.
Repeat
the
test
with
the
car
facing
uphill;
check
that
in
both
cases
the
selector
is
trapped
by
the
gate
in
the ‘P’
position.
21.
Re-check the
■uid level.
22.
Check for
transmission
leaks.
Section
Fd.4
CONVERTER FAULT
DIAGNOSIS
Torque
converter
faults
can
only
be
correctly
determined
when road
test
findings, transmission
performance,
engine
condition,
and
stall
test
results have
all
been
considered.
Slipping
stator
(stator
free-wheel slipping)
1.
Inability
to
pull
away on
steep
gradients.
2.
Poor
acceleration
from
rest.
3.
Stall
test
reading
LOW.
2.
If
the fault
is
present
in
only
one
position
a
faulty
component
is
the
most
likely
cause.
3.
Stall
test
reading
HIGH.
Section
Fd.5
STALL TEST
Stall speed
is
the
maximum
speed attainable
at
forced
throttle
(kick-down)
with the
converter
turbine held
stationary.
IMPORTANT—Duration
of
stall
must not
exceed 10
seconds.
1.
Apply
the hand brake
and
chock the wheels.
2.
Connect
tool 18G
677
Z
to
the
engine
and
position
the
instrument
so
that
it
can
be read
from the driving
seat.
3.
Run
the
engine
until the
normal
operating
temperature
of the
transmission is
reached.
4.
Select
‘P’ and
check
the
transmission
■uid level—Section Fd.2.
5.
Apply the foot brake,
select ‘L1’
or
‘R’
(as
required
for
test
elimination),
depress
the accelerator pedal
to
the kick-down
position
for
not
more
than
10
seconds
and
note
the highest
r.p.m.
reading
on
the
instrument.
6.
Check the reading
obtained
against
the
following
chart, and
refer
to
Section
Fd.4
for ‘FAULT
Seized
stator
(stator
free-wheel
seized—unusual fault)
DIAGNOSIS
'
1.
Reduced
maximum
speed
in
all
gears,
pronounced
in
tOP
Tatio-
R.P.M.
CONDITION INDICATED
2.
Severe
overheating
of
converter
and transmission.
3.
Stall
test
reading
NORMAL.
Under
1,250
Slipping
stator
Transmission
slip
(selected
gear
components
slipping)
1:800
to
2,100
NORMAL.
_
1.
If the fault
is apparent
in
both
‘L1’ and ‘R’
it is
over 2:700
Transmlssmn
511p
usually
due
to
low
pressure.
UP-SHIFTS
DOWN-SHIFTS
DRIVING
CONDITIONS 1—2
2—3
3—2
3—1
2—1
m.p.h.
km.p.h.
m.p.h.
km.p.h. m.p.h.
km.p.h.
m.p.h. km.p.h.
m.p.h.
km.p.h.
‘D’
Selected
Minimum
throttle
8—12‘
13—19
13—17 21—27
Full
throttle
22—29
35—46
41—48
65—78
Forced throttle
(kick-down)
30—37
48—60
57—62 91—100
50—57 80—91
20—26 32—41
20—26
32—41
‘L2’
Selected
Minimum
throttle
Full throttle
2—5 3—8
Forced
throttle
(kick-down)
20—26
32 41
‘L1’
Selected
Minimum
throttle
10—15 16—24
MGB. Issue 1.
15676
Fd.l3

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English