Road Test Procedure; Topping Up Fluid; Refilling After Draining; Towing For Recovery - MG MGB Workshop Manual

Fd
THE AUTOMATIC
GEARBOX
is cold, the correct
level will be '1'56'in. (8 mm.) below the
'MAX' mark.
The correct checking procedure is as follows.
1.
With the car standing level apply the hand brake and
move the selector lever to 'P'.
2. Start the engine and run it at idle speed for two
minutes.
3.
With the
engine still idling
in
'P', withdraw
the
dipstick from the ■ller tube and wipe it with a clean
piece of paper, or nylon material. Do not use rag.
4. Reinsert the dipstick, withdraw'
it again immediately
and check the ■uid level indication.
Topping
up fluid
5. Withdraw the dipstick and add the required quantity
of
a recommended Automatic Transmission Fluid
through the combined dipstick/ filler tube. Use only a
recommended
■uid;
observe scrupulous cleanliness;
DO NOT OVERFILL.
The difference
between the 'MAX' and 'MIN'
marks
on the dipstick is equivalent to 1 pint (1.2 US. pints;
.57 litres).
Refilling
after draining
6. The quantity
of ■uid
required
when
refilling will
depend on the amount
still remaining in the torque
converter,
which can be up to 5 pints (6 US. pints;
2.8 litres).
IMPORTANT—Do
not re-use ■uid showing signs of
contamination.
Towing for recovery
NOTE—The car cannot be tow-started.
7. If the transmission is operating satisfactorily the car
may be towed with the selector at 'N' after ensuring
that the ■uid is at the correct level, for distances up to
40 miles (64 km.) at a speed not exceeding 30 m.p.h.
(48 km.p.h.).
If the transmission
is inoperative
or if
there is reason to suspect a fault or damage, or the
towing distance or speeds exceeds the limits given, the
propeller shaft must be disconnected,
or alternatively,
the
car towed with the rear wheels clear of the
ground.
Section Fd.3
ROAD TEST PROCEDURE
In order to ascertain the precise nature of a fault it is first
essential to thoroughly investigate the effect. The following
test procedure
must be carried out in its entirety before
referring to 'FAULT DIAGNOSIS' (Section Fd.4).
Preliminary checks
1.
Check the ■uid level (Section
Fd.2), and top up if
necessary.
' Fd.12
Check the adjustment
of the down-shift
and throttle
cable as described in Section Fd.7.
Fully depress the accelerator pedal to the kick-down
position and check that the carburetter
is fully open.
Stationary
tests
4. Check the operation of the starter inhibitor
switch;
the starter should only operate when the selector is in
'P' or 'N'.
Check that the reverse lights operate only when the
selector is in 'R'.
With the engine idling and the brakes applied check
that forward drive is obtained when 'D', 'L2', and 'L1'
are selected and reverse drive is obtained when 'R' is
selected.
With
'P' selected check that the selector
lever is
trapped by the gate.
Stall the transmission
in 'L1' and 'R' as described in
Section Fd.6 and check for slip and clutch squawk.
NOTE—Do not stall for longer than 10 seconds.
Driving tests
9.
10.
ll.
13.
14.
15.
l6.
17.
Select 'D', release the brakes and accelerate
with
minimum throttle
opening. Check the 172 and 273
shift speeds against the table.
NOTE.——At minimum
throttle
openings the shifts may
be difficult
to detect.
Stop and restart, using full-throttle
acceleration,
i.e.
pedal at detent.
Check
1—2 and 213 shift
speeds
against the table.
At 35 m.p.h. (56 km.p.h.)
in third
gear, depress the
accelerator to the full throttle
position; the car should
accelerate in third gear and should not down-shift
to
second.
At 45 m.p.h. (72 km.p.h.)
in third gear, depress the
accelerator through
the kick-down
position; the
transmission should down-shift
to second gear.
At 15 m.p.h. (24 km.p.h.)
in third gear, depress the
accelerator
to
the kick-down
position; the
transmission should down-shift
to first gear.
Stop and restart using forced throttle
or kick-down
acceleration. Check 172 and 273 shift speeds against
the table.
At 40 m.p.h. (64 km.p.h.)
in third gear, release the
accelerator
and select 'L2'. Check for 3—2 downshift
and engine braking, also the 2—1 roll-out
down-shift
and engine braking.
Stop, and with 'L2' selected use ,full
throttle
to
accelerate to 45 m.p.h. (72 km.p.h.).
Check for 1—2
shift speed clutch slip and squawk.
At 25 m.p.h. (40 km.p.h.)
in 'L2', release the
accelerator and select 'Ll'.
Check the 2—1 downshift
speed and for full engine braking.
MGB. Issue1.
15676